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| key features ? wide input, 8.3 - 16 vdc ? programmable output, 0.75 - 5.5 vdc ? monotonic start up into pre-biased output ? under voltage protection ? short circuit protection ? remote sense ? remote on/off ? design for environment (dfe) ? european commission directive 2002/95/ec (rohs) compliant e datasheet dc/dc regulator input 8.3 - 16 v output 16 a pmb 8818t p the pmb series of sil dc/dc regulators (pol) are in - tended to be used as local distributed power sources in distributed power architecture. the single in-line design makes the pmb series suitable for applications where boardspace is limited. the high efficiency and high reli - ability of the pmb series makes them particularly suited for the communications equipment of today and tomor - row. these products are manufactured using the most advanced technologies and materials to comply with environmental requirements. designed to meet high reliability requirements of systems manufacturers, the pmb responds to world-class specifications. ericsson power modules is an iso 9001/14001 certified supplier. contents product program . . . . . . . . . . . . . . . . . . . . . . 2 mechanical data . . . . . . . . . . . . . . . . . . . . . . 2 connections . . . . . . . . . . . . . . . . . . . . . . . . . 2 absolute maximum ratings . . . . . . . . . . . . . 3 input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 product qualification specification . . . . . . . . 4 safety specification . . . . . . . . . . . . . . . . . . . 5 adjusted to 1.0 vout - data . . . . . . . . . . . . . . 6 adjusted to 1.2 vout - data . . . . . . . . . . . . . . 9 adjusted to 1.5 vout - data . . . . . . . . . . . . . 1 2 adjusted to 1.8 vout - data . . . . . . . . . . . . . 1 5 adjusted to 2.5 vout - data . . . . . . . . . . . . . 1 8 adjusted to 3.3 vout - data . . . . . . . . . . . . . 2 1 adjusted to 5.0 vout - data . . . . . . . . . . . . . 2 4 emc specification . . . . . . . . . . . . . . . . . . . . 2 7 operating information . . . . . . . . . . . . . . . . . 2 8 thermal considerations . . . . . . . . . . . . . . . 3 0 soldering information . . . . . . . . . . . . . . . . . 3 1 delivery package information . . . . . . . . . . . 3 1 compatibility with rohs requirements . . . . 3 1 reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1 sales offices and contact information . . . . 3 2
en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet pin designation function 1-2 + out output voltage 3 + s remote sensing 4 + out output voltage 5 gnd ground* 6 gnd ground* 7-8 + in input voltage 9 vadj output voltage adjust 10 rc remote control v i v o /i o max p o max ordering no. comment output 1 8.3 - 16 v 0.75 - 5.50/16 a 80 w pmb 8818t p released 8.3 - 16 v 1.0 v/16 a 16 w pmb 8118na p on request 1.2 v/16 a 19.2 w pmb 8118la p on request 1.5 v/16 a 24 w pmb 8218h p on request 1.8 v/16 a 28.8 w pmb 8218g p on request 2.5 v/16 a 40 w pmb 8419 p on request 3.3 v/16 a 52.8 w pmb 8510 p on request 5 v/16 a 80 w pmb 8811 p on request option suffix example negative remote control logic n pmb 8818t pn 8 , 8 0 [ 0 . 3 4 6 ] 7 , 4 0 [ 0 . 2 9 1 ] 5 1 , 8 0 [ 2 . 0 3 9 ] 4 8 , 2 6 [ 1 . 9 0 0 ] r e c o m m e n d e d f o o t p r i n t ( c u s t o m e r b o a r d ) , n o c o m p o n e n t s w i t h i n b o r d e r . h o l e s : ? 1 , 0 [ 0 . 0 4 ] t h r o u g h p l a t e d h o l e s w i t h ? 1 , 5 [ 0 . 0 6 ] p a d s o n b o t h s i d e s . n o t e 1 : f o r o t h e r p i n l e n g t h s , r e f e r t o p r o d u c t p r o g r a m / o r d e r i n g i n f o r m a t i o n 1 2 3 4 5 6 7 8 9 1 0 d i m e n s i o n s i n m m [ i n c h ] t o l e r a n c e s ( u n l e s s s p e c i f i e d ) : x , x + / - 0 , 5 [ 0 . 0 2 ] x , x x + / - 0 , 2 5 [ 0 . 0 1 ] e 7 , 0 [ 0 . 2 7 ] 8 , 5 [ 0 . 3 3 ] m a x c h o k e 3 5 , 5 6 [ 1 . 4 0 0 ] 4 8 , 2 6 [ 1 . 9 0 0 ] 2 , 5 4 [ 0 . 1 0 0 ] ( 7 x ) ( 1 , 2 7 [ 0 . 0 5 ] ) 1 3 , 2 0 [ 0 . 5 2 0 ] 5 0 , 8 [ 2 . 0 0 ] p i n l e n g t h 3 , 6 0 [ 0 . 1 4 2 ] ( n o t e 1 ) 1 1 connections mechanical data weight 7.7g pins material: copper alloy plating: matte tin over nickel product program 8 , 8 0 [ 0 . 3 4 6 ] 7 , 4 0 [ 0 . 2 9 1 ] 5 1 , 8 0 [ 2 . 0 3 9 ] 4 8 , 2 6 [ 1 . 9 0 0 ] r e c o m m e n d e d f o o t p r i n t ( c u s t o m e r b o a r d ) , n o c o m p o n e n t s w i t h i n b o r d e r . h o l e s : ? 1 , 0 [ 0 . 0 4 ] t h r o u g h p l a t e d h o l e s w i t h ? 1 , 5 [ 0 . 0 6 ] p a d s o n b o t h s i d e s . n o t e 1 : f o r o t h e r p i n l e n g t h s , r e f e r t o p r o d u c t p r o g r a m / o r d e r i n g i n f o r m a t i o n 1 2 3 4 5 6 7 8 9 1 0 d i m e n s i o n s i n m m [ i n c h ] t o l e r a n c e s ( u n l e s s s p e c i f i e d ) : x , x + / - 0 , 5 [ 0 . 0 2 ] x , x x + / - 0 , 2 5 [ 0 . 0 1 ] e 7 , 0 [ 0 . 2 7 ] 8 , 5 [ 0 . 3 3 ] m a x c h o k e 3 5 , 5 6 [ 1 . 4 0 0 ] 4 8 , 2 6 [ 1 . 9 0 0 ] 2 , 5 4 [ 0 . 1 0 0 ] ( 7 x ) ( 1 , 2 7 [ 0 . 0 5 ] ) 1 3 , 2 0 [ 0 . 5 2 0 ] 5 0 , 8 [ 2 . 0 0 ] p i n l e n g t h 3 , 6 0 [ 0 . 1 4 2 ] ( n o t e 1 ) 1 1 8 , 8 0 [ 0 . 3 4 6 ] 7 , 4 0 [ 0 . 2 9 1 ] 5 1 , 8 0 [ 2 . 0 3 9 ] 4 8 , 2 6 [ 1 . 9 0 0 ] r e c o m m e n d e d f o o t p r i n t ( c u s t o m e r b o a r d ) , n o c o m p o n e n t s w i t h i n b o r d e r . h o l e s : ? 1 , 0 [ 0 . 0 4 ] t h r o u g h p l a t e d h o l e s w i t h ? 1 , 5 [ 0 . 0 6 ] p a d s o n b o t h s i d e s . n o t e 1 : f o r o t h e r p i n l e n g t h s , r e f e r t o p r o d u c t p r o g r a m / o r d e r i n g i n f o r m a t i o n 1 2 3 4 5 6 7 8 9 1 0 d i m e n s i o n s i n m m [ i n c h ] t o l e r a n c e s ( u n l e s s s p e c i f i e d ) : x , x + / - 0 , 5 [ 0 . 0 2 ] x , x x + / - 0 , 2 5 [ 0 . 0 1 ] e 7 , 0 [ 0 . 2 7 ] 8 , 5 [ 0 . 3 3 ] m a x c h o k e 3 5 , 5 6 [ 1 . 4 0 0 ] 4 8 , 2 6 [ 1 . 9 0 0 ] 2 , 5 4 [ 0 . 1 0 0 ] ( 7 x ) ( 1 , 2 7 [ 0 . 0 5 ] ) 1 3 , 2 0 [ 0 . 5 2 0 ] 5 0 , 8 [ 2 . 0 0 ] p i n l e n g t h 3 , 6 0 [ 0 . 1 4 2 ] ( n o t e 1 ) 1 1 * should be connected together through a ground plane. en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet characteristics min typ max unit t ref maximum operating temperature, see thermal considerations -45 +115 ?c t s storage temperature -55 +125 ?c v i input voltage -0.3 16 vdc v tr input voltage transient -0.3 40 vdc v rc remote control voltage negative logic -0.3 16 vdc positive logic -0.3 16 vdc characteristics conditions min typ max unit v i input voltage range 8.3 12 16 v v loff turn-off input voltage i o max 7.8 v v ion turn-on input voltage i o max 8.0 v c i input capacitance 30 f p ii input idling power i o = 0 a, v i = 12 v v o = 1.00 v 485 580 mw v o = 1.20 v 520 625 mw v o = 1.50 v 580 695 mw v o = 1.80 v 640 770 mw v o = 2.50 v 805 965 mw v o = 3.30 v 985 1180 mw v o = 5.00 v 1280 1520 mw p rc input stand-by power v i = 12 v, rc activated 40 mw v i ac input ripple 1) 20 hz ... 5 mhz v i = 12 v, i o = 1.0 x i o max v o = 1.00 v 170 mv p-p v o = 1.20 v 190 mv p-p v o = 1.50 v 210 mv p-p v o = 1.80 v 250 mv p-p v o = 2.50 v 310 mv p-p v o = 3.30 v 350 mv p-p v o = 5.00 v 450 mv p-p input stress in excess of absolute maximum ratings may cause permanent damage. absolute maximum ratings, sometimes referred to as no destruction limits, are normally tested with one parameter at a time exceeding the limits of output data or electrical characteristics. if exposed to stress above these limits, function and performance may degrade in an unspecified manner. absolute maximum ratings t ref = -30 ... +90 ?c, v i = 8.3...16 v unless otherwise specified typ values specified at: t ref = +25 ?c, v i nom, i o max = 16 a 1) measured with 4 x 4.7 f ceramic capacitors fundamental circuit diagram gnd gnd pwm +in +out +sense vadj controller ref gnd error amplifier rc rc gnd block en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet characteristics random vibration iec 60068-2-64 frequency acceleration density 5 ... 500 hz 0.5 g 2 /hz mechanical shock (half sinus) iec 60068-2-27 peak acceleration duration 50 g 11 ms lead integrity iec 60068-2-21 ub simultaneous bending all leads temperature cycling jesd22-a104-b g temperature number of cycles -40 ... +125 ?c 300 accelerated damp heat jesd22-a101-b temperature humidity duration bias +85 ?c 85 % rh 1000 hours max input voltage solderability iec 60068-2-54 (aged according to jesd22-a101- b, 240h no bias) solder immersion depth time for onset of wetting wetting force 2 mm < 2.5 s > 200 mn/m cold (in operation) iec 60068-2-1 temperature duration -45 ?c 72 h high temperature storage jesd22-a103-b a temperature duration +125 ?c 1000 h product qualification specification en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet ericsson power modules dc/dc converters and dc/dc regulators are designed in accordance with safety standards iec/en/ul 60 950, safety of information technology equipment. iec/en/ul60950 contains requirements to prevent injury or damage due to the following hazards: ? electrical shock ? energy hazards ? fire ? mechanical and heat hazards ? radiation hazards ? chemical hazards on-board dc-dc converters are defined as component power supplies. as components they cannot fully comply with the provisions of any safety requirements without conditions of acceptability. it is the responsibility of the installer to ensure that the final product housing these components complies with the requirements of all applicable safety standards and directives for the final product. component power supplies for general use should comply with the requirements in iec60950, en60950 and ul60950 safety of information technology equipment. there are other more product related standards, e.g. iec61204-7 safety standard for power supplies", ieee802.3af ethernet lan/man data terminal equipment power, and ets300132-2 power supply interface at the input to telecommunications equipment; part 2: dc, but all of these standards are based on iec/en/ul60950 with regards to safety. ericsson power modules dc/dc converters and dc/dc regulators are ul 60 950 recognized and certified in accordance with en 60 950. the flammability rating for all construction parts of the products meets ul 94v-0. the products should be installed in the end-use equipment, in accordance with the requirements of the ultimate application. normally the output of the dc/dc converter is considered as selv (safety extra low voltage) and the input source must be isolated by minimum double or reinforced insulation from the primary circuit (ac mains) in accordance with iec/en/ul 60 950. safety specification isolated dc/dc converters. the input voltage to the dc/dc regulator is selv (safety extra low voltage) and the output remains selv under normal and abnormal operating conditions. it is recommended that a slow blow fuse with a rating twice the maximum input current per selected product be used at the input of each dc/dc regulator. non-isolated dc/dc regulators. 24 v dc systems. the input voltage to the dc/dc converter is selv (safety extra low voltage) and the output remains selv under normal and abnormal operating conditions. 48 and 60 v dc systems. if the input voltage to ericsson power modules dc/dc converter is 75 v dc or less, then the output remains selv (safety extra low voltage) under normal and abnormal operating conditions. single fault testing in the input power supply circuit should be performed with the dc/dc converter connected to demonstrate that the input voltage does not exceed 75 v dc. if the input power source circuit is a dc power system, the source may be treated as a tnv2 circuit and testing has demonstrated compliance with selv limits and isolation requirements equivalent to basic insulation in accordance with iec/en/ul 60 950. it is recommended that a fast blow fuse with a rating twice the maximum input current per selected product be used at the input of each dc/dc converter. if an input filter is used in the circuit the fuse should be placed in front of the input filter. in the rare event of a component problem in the input filter or in the dc/dc converter that imposes a short circuit on the input source, this fuse will provide the following functions: ? isolate the faulty dc/dc converter from the input power source so as not to affect the operation of other parts of the system. ? protect the distribution wiring from excessive current and power loss thus preventing hazardous overheating. the galvanic isolation is verified in an electric strength test. the test voltage (v iso ) between input and output is 1500 vdc or 2250 vdc for 60 seconds (refer to product specification). leakage current is less than 1a at nominal input voltage. general information. en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet t ref = -30 ... +90 c, v i = 8.3 ... 16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom. i o max = 16 a. note: +sense connected to +out. r adj 41.42 k ? adjusted to 1.0 vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 2 mv dv o load regulation 0 .01... 1.0 x i o max, v i nom 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 100 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 22 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 24 s i o output current 0 16 a p o max max output power 16 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 1.00 v 83.6 % efficiency - 100% load i o = i o max, v o = 1.00 v 77.3 81.5 % p d power dissipation i o = i o max, v o = 1.00 v 3.6 4.7 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 1.00 v 2.4 a mtbf predicted reliability 5 million hours en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet start-up output voltage vs. load current. start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation output characteristics adjusted to 1.0 vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 7 > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f output current derating at 1 v input available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref = +25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref =+25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to 1.0 vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet t ref = -30 ... +90 c, v i = 8.3 ... 16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom, i o max = 16 a. note: +sense connected to +out. r adj 22.46 k ? adjusted to 1. vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 2 mv dv o load regulation 0 .01... 1.0 x i o max, v i nom 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 100 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 21 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 21 s i o output current 0 16 a p o max max output power 19.2 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 1.20 v 85.6 % efficiency - 100% load i o = i o max, v o = 1.20 v 80.1 83.9 % p d power dissipation i o = i o max, v o = 1.20 v 3.6 4.7 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 1.20 v 2.8 a mtbf predicted reliability 5 million hours 10 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output characteristic start-up output voltage vs. load current. start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to 1. vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 [a] [v] 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f output current derating at 1 v input available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. 11 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref = +25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to 1. vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet t ref = -30 ... +90 c, v i = 8.3 ...16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom. i o max = 16 a. note: +sense connected to +out. r adj 13.05 k ? adjusted to 1. vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 2 mv dv o load regulation 0 .01... 1.0 x i o max, v i nom 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 100 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 20 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 20 s i o output current 0 16 a p o max max output power 24 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 1.50 v 87.7 % efficiency - 100% load i o = i o max, v o = 1.50 v 82.9 86.3 % p d power dissipation i o = i o max, v o = 1.50 v 3.8 4.9 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 1.50 v 3.4 a mtbf predicted reliability 5 million hours 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output characteristic start-up output voltage vs. load current. < " > < 7 > 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to 1. vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f output current derating at 1 v input available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref = +25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to 1. vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet t ref = C30+90 c, v i = 8.3 ... 16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom. i o max = 16 a. note: +sense connected to +out. r adj 9.024 k ? adjusted to 1. vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 2 mv dv o load regulation 0 .01... 1.0 x i o max, v i nom 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 100 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 18 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 18 s i o output current 0 16 a p o max max output power 28.8 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 1.80 v 89.2 % efficiency - 100% load i o = i o max, v o = 1.80 v 85.0 88.1 % p d power dissipation i o = i o max, v o = 1.80 v 3.9 5.1 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 1.80 v 4.0 a mtbf predicted reliability 5 million hours 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet efficiency output current derating at 1 v input adjusted to 1. vout - typical characteristics output characteristic start-up output voltage vs. load current. efficiency vs. load current and input voltage at t ref = +25 c [a] [% ] 7 7 7 7 < " > < 7 > 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. power dissipation < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref =+25 c < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output ripple adjusted to 1. vout - typical characteristics transient output voltage response to load current step-change (4-12-4 a) at t ref = +25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet t ref = -30 ... +90 c, v i = 8.3 ...16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom. i o max = 16 a. note: +sense connected to +out. r adj 5.009 k ? adjusted to . vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 6 mv dv o load regulation 0 .01... 1.0 x i o max, v i nom 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 150 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 16 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 16 s i o output current 0 16 a p o max max output power 40 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 2.50 v 91.4 % efficiency - 100% load i o = i o max, v o = 2.50 v 88.1 90.6 % p d power dissipation i o = i o max, v o = 2.50 v 4.1 5.4 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 2.50 v 5.3 a mtbf predicted reliability 5 million hours 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output characteristic start-up output voltage vs. load current. [a] [v] 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to . vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 [a] [w ] 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f output current derating at 1 v input available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. 0 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref = +25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to . vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet t ref = -30 ... +90 c, v i = 8.3 ...16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom . i o max = 16 a. note: +sense connected to +out. r adj 3.122 k ? adjusted to . vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 6 mv dv o load regulation i o = 0.01... i o max, v i nom 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 150 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 17 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 17 s i o output current 0 16 a p o max max output power 52.8 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0,5 x i o max, v o = 3.30 v 92.8 % efficiency - 100% load i o = i o max, v o = 3.30 v 90.1 92.3 % p d power dissipation i o = i o max, v o = 3.30 v 4.3 5.8 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 3.30 v 6.9 a mtbf predicted reliability 5 million hours en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output current derating at 1 v input output characteristic start-up output voltage vs. load current. available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < " > < 7 > 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to . vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref = +25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to . vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet t ref = -30 ... +90 c, v i = 8.3 ...16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom . i o max = 16 a. note: +sense connected to +out. r adj 1.472 k ? adjusted to .0 vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 12 mv dv o load regulation 0 .01... 1.0 x i o max, v i nom 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 150 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 16 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 15 s i o output current 0 16 a p o max max output power 80 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 3.30 v 94.5 % efficiency - 100% load i o = i o max, v o = 3.30 v 91.0 94.3 % p d power dissipation i o = i o max, v o = 3.30 v 4.8 7.9 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 3.30 v 10.2 a mtbf predicted reliability 5 million hours en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output current derating at 1 v input output characteristic start-up output voltage vs. load current. available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < " > < 7 > 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (2 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to .0 vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (2 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref =+25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to .0 vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet emc specification the conducted emi measurement was performed using a regulator placed directly on the test bench. the fundamental switching frequency for pmb 8000 is 300 khz. the measure - ment below has been performed with vin = 12 v, vout = 5 v and max load. input filter 4 x 4.7 m f and output filter 2 x 150 m f was used during the measurement. 1 s j o u f e $ j s d v u # p b s e & . $ 3 f d j w f s $ p n q v u f s d n d n % $ 1 p x f s 4 p v s d f 3 f t j t u j w f - p b e ? ' 1 p x f s 3 f h v m b u p s layout recommendation -1 0 0 20 40 60 80 100 lev el [d b a] 150 k 300 k 5 00 k 1 m 2 m 3 m 5 m 7 m 1 0m 30m fr eque nc y [h z] m es ep m_ pm b 16a _1 _p re pk pmb 8818. conducted emi input terminal value (typ) # / $ $ p o o f d u p s u p 4 d p q f 7 p v u 4 f o t f 5 s j n ( / % - p b e - p x & 4 3 1 p m z n f s $ b q b d j u p s $ p o e v d u p s g s p n 7 p v u u p d b q b d j u p s t n n < j o > y m output ripple and noise test setup output ripple and noise the circuit below has been used for the ripple and noise measurements on the pmb 8000 series dc/dc regulators. the radiated emi performance of the dc/dc regulator will be optimised by including a ground plane in the pcb area under the dc/dc regulator. this approach will return switch - ing noise to ground as directly as possible, with improve - ments to both emissions and susceptibility. test set up. en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet vout (v) radj (kohm) vtrim (v) 0.75 open open 1.0 41.42 0.684 1.2 22.46 0.670 1.5 13.05 0.650 1.8 9.024 0.630 2.5 5.009 0.583 3.3 3.122 0.530 5.00 1.472 0.417 5.50 1.212 0.383 circuit configuration for output voltage adjust i n c r e a s e + o u t g n d v a d j l o a d r a d j s e n s e * o d s f b t f 0 v u ( / % 7 b e k - p b e 4 f o t f operating information remote control (rc) standard version with "positive logic". rc regulator condition min typ max unit low level referenced to gnd off -0.3 0.3 v open on 1.7 16 v the rc pin may be used to turn on or turn off the regulator using a suitable open collector function. turn off is achieved by connecting the rc pin to ground. the regulator will run in normal operation when the rc pin is left open. r c + i n m o d u l e + i n g n d input voltage the input voltage range 8.316 vdc makes the pmb 8000 easy to use in intermediate bus applications when pow - ered by a non-regulated bus converter or a regulated bus converter. for output voltage trims over 5.25 vout the input voltage must be reduced to a maximum of 14 v in order to maintain specified data. rc regulator condition min typ max unit high level referenced to gnd off 1.7 16 v open on the rc pin may be used to turn on or turn off the regulator using a suitable open collector function.turn off is achieved by connecting the rc pin to the input voltage. the regulator will run in normal operation when the rc pin is left open. r c v i m o d u l e v i g n d option "negative logic" output voltage adjust (v adj ) all pmb 8000 series dc/dc regulators have an output voltage adjust pin (vadj). this pin can be used to adjust the output voltage above output voltage initial setting (0.75 v). when increasing the output voltage the maximum power rating of the converter remains the same, and the output current capability will therefore decrease correspondingly. to increase the output voltage a resistor or a voltage signal should be connected/applied between vadj pin and gnd, pin 5. the resistor/voltage signal value for some standard output trims are given below, for other voltage set points use the formulas to calculate the correct resistor or voltage signal. for output voltages of 5.25 v and higher the input voltage is restricted to maximum 14 vin. formula 1: radj = (10 500 / (vout C 0.7525)) C 1000 (ohm) formula 2: vtrim = (0.7 C 0.0667 x (vout C 0.7525)) (v) turn off input voltage the pmb 8000 series dc/dc regulators monitor the input voltage and will turn on and turn off at predetermined levels. the minimum hysteresis between turn on and turn off input voltage is 0.2 v where the turn on input voltage is the high - est. en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet optional input filter to minimize input ripple and to ensure even better stability more capacitors can be added, see table below. consider the max output power in a given application and choose sufficient capacitors to obtain desired ripple level. make sure that the extra capacitors are placed near the input pins. the table below is just an example since the board layout also has effect on the result. required output filter external output capacitance is also required to reduce the output ripple and to obtain specified load step response. it is recommended to use low esr polymer capacitors or low esr ceramic capacitor s. minimum requirement: pmb 8818t p 2 x 150 f. (low esr polymer type). this is the output filter used in the verification and needed to meet the specification. output power desired input ripple (mv p-p ) 150 250 500 0-20 w 2 x 4.7 f ----- ----- 20-40 w 5 x 4.7 f 2 x 4.7 f ----- 40-60 w 8 x 4.7 f 4 x 4.7 f 2 x 4.7 f 60-80 w 11 x 4.7 f 7 x 4.7 f 4 x 4.7 f note: all output characteristics in the datasheet are measured with 4 x 4.7 f at the input pins. all pmb 8000 series dc/dc regulators have a positive re - mote sense pin that can be used to compensate for moder - ate amounts of resistance in the distribution system and al - low for voltage regulation at the load or other selected point. the remote sense line will carry very little current and does not need a large cross sectional area. however, the sense line on the pcb should be located close to a ground trace or ground plane. the remote sense circuitry will compensate for up to 10% voltage drop between the sense voltage and the voltage at the output pins from v o nom. if the remote sense is not needed the sense pin should be left open or connected to the positive output. remote sense current limit protection the pmb 8000 series dc/dc regulators include current limiting circuitry that allows them to withstand continuous overloads or short circuit conditions on the output. the out - put voltage will decrease towards zero for output currents in excess of max output current (iomax). when the current limit is reached the regulator will go into hiccup mode. the cur - rent limit is temperature dependent, i.e. the limit decrease at higher operating temperature, the regulator is guaranteed to start at i o max x 1.25 @ tref 115c. the regulator will resume normal operation after removal of the overload. the load distribution system should be designed to carry the maximum output short circuit current specified. over temperature protection (otp) the pmb 8000 series dc/dc regulators are protected from thermal overload by an internal over temperature shutdown circuit. when the pcb temperature near the ic circuit reach - es 130 c the converter will shut down immediately. the regulator will make continuous attempts to start up (non- latching mode) and resume normal operation automatically when the temperature has dropped below the temperature threshold. input and output impedance the impedance of both the power source and the load will interact with the impedance of the dc/dc regulator. it is most important to have a low characteristic impedance, both at the input and output, as the regulators have a low energy storage capability. use capacitors across the input if the source inductance is greater than 4.7 m h. suitable input capacitors are 22 m f - 220 m f low esr ceramics. minimum required external capacitors required input filter external input capacitors are required to increase the life - time of the internal capacitors. low esr ceramics should be used, the minimum input capacitance is stated below: pmb 8818t p 2 x 4.7 m f maximum capacitive load when powering loads with significant dynamic current requirements, the voltage regulation at the load can be improved by addition of decoupling capacitance at the load. the most effective technique is to locate low esr ceramic capacitors as close to the load as possible, using several capacitors to lower the total esr. these ceramic capacitors will handle short duration high-frequency components of dynamic load changes. in addition, higher values of capacitors (electrolytic capacitors) should be used to handle the mid-frequency components. it is equally important to use good design practice when configuring the dc distribution system. low resistance and low inductance pcb layouts and cabling should be used. remember that when using remote sensing, all resistance (including the esr), inductance and capacitance of the distribution system is within the feedback loop of the regulator. this can affect on the regulators compensation and the resulting stability and dynamic response performance. very low esr and high capacitance must be used with care. a rule of thumb is that the total capacitance must never exceed typically 500-700 m f if only low esr (< 2m ? ) ceramic capacitors are used. if more capacitance is needed, a combination of low esr type and electrolytic capacitors should be used, otherwise the stability will be affected. operating information 0 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet thermal considerations general the pmb 8000 series dc/dc regulators are designed to operate in a variety of thermal environments, however sufficient cooling should be provided to help ensure reliable operation. heat is removed by conduction, convection and radiation to the surrounding environment. increased airflow enhances the heat transfer via convection. proper cooling can be verified by measuring the temperature at the reference point (t ref ). 1 t r e f the pmb 8000 thermal testing is performed with the product mounted on an fr4 board 254 ? 254 mm with 8 ? 254 mm with 8 254 mm with 8 layers of 35 m m copper. airflow is perpendicular to the t ref side. 2 5 m m [ 1 i n . ] a i r f l o w t e s t b o a r d c h o k e calculation of ambient temperature by using the thermal resistance the maximum allowed ambient temperature can be calculated. 1. the powerloss is calculated by using the formula ((1/ ) - 1) ? output power = power losses. = efficiency of converter. e.g 88% = 0.88 2. find the value of the thermal resistance for each product in the diagram by using the airflow speed at the output section of the converter. take the thermal resistance x powerloss to get the temperature increase. 3. max allowed calculated ambient temperature is: max t ref of dc/dc regulator C temperature increase. b. 5.11 w ? 7.2 c/w = 36.8 c c. 115 c - 36.8 c = max ambient temperature is 78.2 c the real temperature will be dependent on several factors, like pcb size and type, direction of airflow, air turbulence etc. it is recommended to verify the temperature by testing. a. (( ) - 1) ? 80 w = 5.11 w 1 0.94 e.g v output at 1 m/s, full load, 1 v in: thermal resistance vs. airspeed measured at the regulator. < n t > < ? $ 8 > 7 j o 7 p v u 7 j o 7 p v u 7 j o 7 p v u the pmb 8000 series regulator can accept up to 8mf of capacitive load on the output at full load. this gives <500 m f/a of i o . when using that large capacitance it is important to consider the selection of output capacitors; the resulting behavior is a combination of the amount of capacitance and esr. a combination of low esr and output capacitance exceeding 8mf for pmb 8818 can cause the regulator into over current protection mode (hick-up) due to high start up current. the output filter must therefore be designed without exceeding the above stated capacitance levels if the esr is lower then 30-40 m ? . parallel operation the pmb 8000 series dc/dc regulators can be connected in parallel with a common input. paralleling is accomplished by connecting the output voltage pins directly and using a load sharing device on the input. layout considerations should be made to avoid load imbalance. for more details on paralleling, please consult your local applications support. (max 115 c ) 1 en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet the pmb 8000 series dc/dc regulators are intended for manual or wave soldering. the plastic body of the pin connectors resists soldering heat for limited time up to 260 c. when hand soldering, care should be taken to avoid direct contact between the hot soldering iron tip and the pins for more than a few seconds in order to avoid melting of the plastic. delivery package information the pmb 8000 series regulators are delivered in antistatic trays with jedec standard outer dimensions. tray capacity 25 pcs. each box contains 4 full trays and one empty that functions as a lid. compatibility with rohs requirements the products are compatible with the relevant clauses and requirements of the rohs directive 2002/95/ec and have a maximum concentration value of 0.1% by weight in homogeneous materials for lead, mercury, hexavalent chromium, pbb and pbde and of 0.01% by weight in homogeneous materials for cadmium. exemptions in the rohs directive utilized in ericsson power modules products include: ? lead in high melting temperature type solder (used to lead in high melting temperature type solder (used to solder the die in semiconductor packages) ? lead in glass of electronics components and in electronic lead in glass of electronics components and in electronic ceramic parts (e.g. fill material in chip resistors) ? lead as an alloying element in copper alloy containing lead as an alloying element in copper alloy containing up to 4% lead by weight (used in connection pins made of brass reliability the mean time between failure (mtbf) of the pmb 8000 series dc/dc regulator family is calculated to be greater than 5 million hours at full output power and a reference temperature of +40 c using telcordia sr 332. soldering information en/lzt 146 066 r2a ? ericsson power modules, april 2007 pmb 8818t p datasheet sales offices and contact information company headquarters ericsson power modules ab lm ericssons v?g 30 se-126 25 stockholm sweden phone: +46-8-568-69620 fax: +46-8-568-69599 china ericsson simtek electronics co. 33 fuhua road jiading district shanghai 201 818 china phone: +86-21-5990-3258 fax: +86-21-5990-0188 north and south america ericsson inc. power modules 6300 legacy dr. plano, tx 75024 usa phone: +1-972-583-5254 +1-972-583-6910 fax: +1-972-583-7839 hong kong (asia pacific) ericsson ltd. 12/f. devon house 979 kings road quarry bay hong kong phone: +852-2590-2453 fax: +852-2590-7152 italy, spain (mediterranean) ericsson power modules ab via cadorna 71 20090 vimodrone (mi) italy phone: +39-02-265-946-07 fax: +39-02-265-946-69 all other countries contact company headquarters or visit our website: www.ericsson.com/powermodules information given in this data sheet is believed to be accurate and reliable. no responsibility is assumed for the consequences of its use nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of ericsson power modules. these products are sold only according to ericsson power modules general conditions of sale, unless otherwise confirmed in writing. specifications subject to change without notice. germany, austria ericsson power modules ab mhlhauser weg 18 85737 ismaning germany phone: +49-89-9500-6905 fax: +49-89-9500-6911 japan ericsson power modules ab kimura daini building, 3 fl. 3-29-7 minami-oomachi, shinagawa-ka tokyo 140-0013 japan phone: +81-3-5733-5107 fax: +81-3-5753-5162 |
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