View SLIN-20E1A_8611583.PDF datasheet online --- IC-ON-LINE

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bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 1 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. features applications description the SLIN-20E1Ax power modules are non-isolated dc-dc conver ters that can deliver up to 20a of output current. these modules operate over a wide range of input voltage (v in = 4.5vdc-14vdc) and provide a precisely regulated output voltage from 0.69vdc to 5.5vdc, programmable via an external resistor. two new features added with this family of products are fr equency synchronization and the tunable loop tm . other features include remote on/off, adjustable output voltage, over curren t and over temperature protection, power good and output voltage sequencing. the tunable loop tm allows the user to optimize the dynamic response of the converter to match the load with reduced amount of output capaci tance leading to savings on cost and pwb area. part selection output voltage input voltage max. output current typical efficiency model number active high model number active low 0.69 vdc - 5.5 vdc 4.5 vdc - 14 vdc 20 a 90% SLIN-20E1A0 SLIN-20E1Al notes: add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation s lin ? 20 e 1a 0 1 2 3 4 5 6 1---surface mount 4--- wide input voltage range (4.5-14v) 2---series code 5--- wide out put voltage range (0.69-5.5v) 3---output current (20a) 6--- enable, active high, change ?0? to ?l? means active low ? wide input voltage range ? ability to sink and source current ? fixed switching frequency ? over temperature protection ? power good signal ? output over current protection ? remote sense ? remote on/off ? tunable loop tm (a registered trademark of lineage power systems) to optimize dynamic output voltage response ? flexible output voltage sequencing ? fixed switching frequency and ability to synchronize with external clock ? class 1, category 2, non-isolated dc/dc converter (refer to ipc-9592) ? compliant to rohs eu directive 2002/95/ec ? compatible in a pb-free or snpb reflow environment ? ul * 60950-1recognized, csa ? c22.2 no. 60950-1-03 certified ? vde ? 0805:2001-12 (en60950-1) licensed ? distributed power architectures ? servers and storage applications ? intermediate bus voltage applications ? networking equipment ? telecommunications equipment ? industrial equipment SLIN-20E1Ax rohs com p liant rev.g
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 2 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. absolute maximum ratings parameter min typ max unit notes continuous input voltage -0.3 - 15 v voltage on seq terminal -0.3 - v in v voltage on sync terminal -0.3 - 12 v voltage on pg terminal -0.3 - 6 v operating ambient tem perature -40 - 85 c storage temperature -55 - 125 c note: stresses in excess of the absolute maximum rating s can cause permanent dama ge to the device. these are absolute stress ratings only, functional operati on of the device is not implied at these or any other conditions in excess of those given in the operatio ns sections of the data sheet. exposure to absolute maximum ratings for extended periods can adv ersely affect the device reliability. input specifications parameter min typ max unit notes operating input voltage 4.5 - 14 v input current (full load) - - 20 a v in =4.5v to 14v - 42 - ma vo=0.69v, v in =10v, i o =0, module enabled input current (no load) - 74 - ma vo=3.3v, v in =12v, i o =0, module enabled input stand-by current - 3 - ma v in = 12v, module disabled input reflected ripple current (pk-pk) - 43 - ma 5hz to 20mhz, 1 h source impedance; v in =4.5 to 14v , i o = i omax i 2 t inrush current transient - - 1 a 2 s input ripple rejection (120hz) - 45 - db turn-on threshold - 4.45 - v turn-off threshold - 4.2 - v hysteresis - 0.25 - v caution: this converter is not internally fused. an input line fuse must be used in application. this power module can be used in a wide variety of appl ications, ranging from simple standalone operation to an integrated part of sophisticated power architecture. to preserve maximum flexibility, internal fusing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. the safety agencies require a fast-acting fuse with a maximum rating of 20a. based on the information provided in this data sheet on inrush energy and maximum dc input curren t, the same type of fuse with a lower rating can be used. refer to the fuse manufacturer?s data sheet for further information. note: unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 3 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. output specifications parameter min typ max unit notes output voltage set point -1 .5 - +1.5 %vo,set output voltage -2.5 - +2.5 %vo,set over all operating input voltage, resistive load, and temperature conditio ns until end of life adjustment range 1 0.69 - 5.5 v selected by an external resistor remote sense range - - 0.5 v load regulation v o 2.5v v o < 2.5v - - - - 10 5 mv mv i o =i o, min to i o, max line regulation v o 2.5v v o < 2.5v - - - - 0.4 10 %vo,set mv v in =v in, min to v in, max temperature regulation (-40c to +85c) - - 0.5 %vo,set v o < 2.5v, t ref =t a, min to t a, max ripple and noise (pk-pk) - 30 80 mv ripple and noise (rms) - 14 28 mv 5hz to 20mhz bw, v in =v in, nom and i o =i o, min to i o, max co = 0.1 f // 10 f ceramic capacitors) output current range 0 - 20 a output dc current limit - 120 - %io,max hiccup mode output short-circuit current - 2.6 - a vo 250mv, hiccup mode output capacitance 2 esr 1 m ? esr 0.15 m ? esr 10 m ? 0 0 0 - - - 200 1000 10000 uf uf uf without the tunable loop tm with the tunable loop tm with the tunable loop tm - 2 - ms case 1: on/off input is enabled and then input power is applied (delay from instant at which v in = v in, min until vo =10% of vo, set) turn-on delay time - 2 - ms case 2: input power is applied for at least one second and then the on /off input is enabled (delay from instant at which von/off is enabled until vo =10% of vo, set) output voltage rise time - 5 - ms time for vo to rise from 10% of vo, set to 90% of vo, set output voltage overshoot - - 3 %vo,set vin=vin, min to vin, max, io=io, min to io, max, with or without maximum external capacitance dynamic load response peak deviation - 380 - mv v50%~100% of max load settling time - 30 - us peak deviation - 300 - mv v100%~50% of max load settling time - 30 - us di/dt=10a/us, vin=vi n,nom, vo=1.5v, ta=25c, co=0 notes: 1. some output voltages may not be possible depending on the input voltage. 2. external capacitors may require using the new tunable loop tm feature to ensure that the module is stable as well as getting the best transient response (see the tunable loop tm section for details). 3. unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 4 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. general specifications parameter min typ max unit notes efficiency vo=0.69v vo=1.2v vo=1.8v vo=2.5v vo=3.3v vo=5.0v - - - - - - 72.1 81.3 85.7 88.0 89.7 91.8 - - - - - - % % % % % % vin= 12vdc, ta=25c io=io, max , vo= vo,set switching frequency - 550 - khz over temperature protection - 135 - c sequencing delay time 10 - - ms delay from v in, min to application of voltage on seq pin tracking accuracy power-up: 2v/ms power-down: 2v/ms - - - - 150 100 mv mv vin, min to vin, ma x; io, min to io, max, vseq < vo pgood (power good) output voltage limit for pgood pulldown resistance of pgood pin 89.1 - - 7 110.8 50 %vo,set ? signal interface open drain, vsupply 6vdc weight - 6.05 - g mtbf 14,262,200 hours hours calculated per bell core sr-332 (io=0.8io, max, vo=5,v ta=40c, telecordia method issue 2, method i case 3) dimensions inches (l w h) millimeters (l w h) 1.30 x 0.53 x 0.334 33.02 x 13.46 x 8.5 - frequency synchronization synchronization frequency range 520 - 600 khz high-level input voltage 2.5 - - v low-level input voltage - - 0.8 v input current, sync - - 1 ma minimum pulse width, sync 250 - - ns minimum setup/hold time, sync 250 - - ns note : unless otherwise indicated, specifications appl y over all operating input voltage, resistive load, and temperature conditions.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 5 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. efficiency data 70 75 80 85 90 0 5 10 15 20 vin=10v vin=7v vin=5v 70 75 80 85 90 95 05101520 vin=14v vin=12v vin=4.5v efficiency, vo=0.69v vo=1.2v 70 75 80 85 90 95 0510152 0 vin=14v vin=12v vin=4.5v 70 75 80 85 90 95 100 0 5 10 15 20 vin=14v vin=12v vin=4.5v efficiency, (%) ) output current, i o (a) efficiency, vo=1.8v vo=2.5v 70 75 80 85 90 95 100 0 5 10 15 2 0 vin=14v vin=12v vin=4.5v 70 75 80 85 90 95 100 0 5 10 15 20 vin=14v vin=12v vin=7v efficiency, (%) output current, i o (a) vo=3.3v vo=5.0v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 6 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. thermal derating curves 4 6 8 10 12 14 16 18 20 22 35 45 55 65 75 85 nc 0.5m/s (100lfm) 1m/s (200lfm) 2m/s (400lfm) 4 6 8 10 12 14 16 18 20 22 25 35 45 55 65 75 85 nc 0.5m/s (100lfm) 1m/s (200lfm) 2m/s (400lfm) output current, io ( a ) ambient temperature, t a o c output current, io ( a ) ambient temperature, t a o c vo=0.69v vo=1.2v 4 6 8 10 12 14 16 18 20 22 25 35 45 55 65 75 85 nc 0.5m/s (100lfm) 1m/s (200lfm) 2m/s (400lfm) 4 6 8 10 12 14 16 18 20 22 25 35 45 55 65 75 85 nc 0.5m/s (100lfm) 1m/s (200lfm) 2m/s (400lfm) output current, io (a) ambient temperature, t a o c output current, io ( a ) ambient temperature, t a o c vo=1.8v vo=2.5v 4 6 8 10 12 14 16 18 20 22 25 35 45 55 65 75 85 nc 0.5m/s (100lfm) 1m/s (200lfm) 2m/s (400lfm) 4 6 8 10 12 14 16 18 20 22 25 35 45 55 65 75 85 nc 0.5m/s (100lfm) 1m/s (200lfm) 2m/s (400lfm) 1.5m/s (300lfm) output current, io ( a ) ambient temperature, t a o c output current, io (a) ambient temperature, t a o c vo=3.3v vo=5.0v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 7 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. ripple and noise waveforms output voltage v o ( v ) ( 10mv/div ) time, t (1 s/div) output voltage v o ( v ) ( 20mv/div ) time, t (1 s/div) vin=12v, vo=0.69v, io = io,max vin=12v, vo=1.2v, io = io,max output voltage v o (v) (20mv/div) time, t (1 s/div) output voltage v o ( v ) ( 20mv/div ) time, t (1 s/div) vin=12v, vo=1.8v, io = io,max vin=12v, vo=2.5v, io = io,max output voltage v o ( v ) ( 20mv/div ) time, t (1 s/div) output voltage v o (v) (20mv/div) time, t (1 s/div) vin=12v, vo=3.3v, io = io,max vin=12v, vo=5.0v, io = io,max
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 8 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. transient response waveforms output current, output voltage i o ( a ) ( 5a/div ) v o ( v ) ( 200mv/div ) time, t (20 s /div) output current, output voltage i o ( a ) ( 5a/div ) v o ( v ) ( 200mv/div ) time, t (20 s /div) transient response to dynamic load change from 0% to 50% to 0%. vo=0.69v transient response to dynamic load change from 0% to 50% to 0%. vo=1.2v output current, output voltage i o (a) (5a/div) v o (v) (200mv/div) time, t (20 s /div) output current, output voltage i o ( a ) ( 5a/div ) v o ( v ) ( 200mv/div ) time, t (20 s /div) transient response to dynamic load change from 0% to 50% to 0%. vo=1.8v transient response to dynamic load change from 0% to 50% to 0%. vo=2.5v output current, output voltage i o ( a ) ( 5a/div ) v o ( v ) ( 200mv/div ) time, t (20 s /div) output current, output voltage i o (a) (5a/div) v o (v) (500mv/div) time, t (20 s /div) transient response to dynamic load change from 0% to 50% to 0%. vo=3.3v transient response to dynamic load change from 0% to 50% to 0%. vo=5.0v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 9 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. startup time on/off voltage output voltage v on/off ( v ) ( 5v/div ) v o ( v ) ( 200mv/div ) time, t (2 ms/div) on/off voltage output voltage v on/off ( v ) ( 5v/div ) v o ( v ) ( 500 m v/div ) time, t (1 ms/div) start-up using on/off voltage (i o = i o,max ), vo=0.69v start-up using on/off voltage (i o = i o,max ), vo=1.2v on/off voltage output voltage v on/off (v) (5v/div) v o (v) (500mv/div) time, t (1 ms/div) on/off voltage output voltage v on/off ( v ) ( 5v/div ) v o ( v ) ( 1v/div ) time, t (1 ms/div) start-up using on/off voltage (i o = i o,max ), vo=1.8v start-up using on/off voltage (i o = i o,max ), vo=2.5v on/off voltage output voltage v on/off ( v ) ( 2v/div ) v o ( v ) ( 1v/div ) time, t (1 ms/div) on/off voltage output voltage v on/off (v) (5v/div) v o (v) (2v/div) time, t (1 ms/div) start-up using on/off voltage (i o = i o,max ), vo=3.3v start-up using on/off voltage (i o = i o,max ), vo=5.0v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 10 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. startup time (continued) output voltage input voltage v o ( v ) ( 1v/div ) v in ( v ) ( 5v/div ) time, t (1 ms/div) output voltage input voltage v o ( v ) ( 1v/div ) v in ( v ) ( 5v/div ) time, t (1 ms/div) start-up using input voltage (vin = 10v, i o = i o,max ), vo=0.69v start-up using input voltage (vin = 12v, i o = i o,max ), vo=1.2v output voltage input voltage v o (v) (1v/div) v in (v) (5v/div) time, t (1 ms/div) i output voltage input voltage v o ( v ) ( 1v/div ) v in ( v ) ( 5v/div ) time, t (1 ms/div) start-up using input voltage (vin = 12v, i o = i o,max ), vo=1.8v start-up using input voltage (vin = 12v, i o = i o,max ), vo=2.5v output voltage input voltage v o ( v ) ( 1v/div ) v in ( v ) ( 5v/div ) time, t (1ms/div) output voltage input voltage v o (v) (1v/div) v in (v) (5v/div) time, t (1ms/div) start-up using input voltage (vin = 12v, i o = i o,max ), vo=3.3v start-up using input voltage (vin = 12v, i o = i o,max ), vo=5.0v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 11 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. test configurations input reflected ripple current test setup. to oscilloscope current probe l test 1 h battery c s 1000 f electrolytic e.s.r.<0.1 f tantalum v in (+) com note: measure input reflected ripple current with a simulated source inductance (l test ) of 1 h. capacitor c s offsets possible battery impedance. measure current as shown above. c in output ripple and noise test setup note: all voltage measurements to be taken at the module terminals, as shown above. if sockets are used then kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. vo+ com 0.1uf resistive load scope u sing bnc socket copper strip ground plane 10uf output voltage and efficiency test setup v o com v in (+) com r load r contact r distribution r contact r distribution r contact r contact r distribution r distribution v in v o note: all voltage measurements to be taken at the module terminals, as shown above. if sockets are used then kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. = v o . i o v in . i in x 100 % efficiency
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 12 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. input filtering the SLIN-20E1Ax should be connected to a low ac-impedanc e source. a highly inductive source can affect the stability of the module. input capaci tance must be placed directly adjacent to the input pin of the module, to minimize input ripple voltage and ensure module stability. to minimize input voltage ripple, low-esr polymer and ce ramic capacitors are recommended at the input of the module. to minimize input voltage ripple, ceramic capacitors are recommended at the input of the module. the figure below shows the input ripple voltage for various output volt ages at 20a of load current with 2x22 f or 3x22 f ceramic capacitors and an input of 12v. 0 50 100 150 200 250 300 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 2x22uf 3x22 uf note: input ripple voltage for various output voltages with 2x 22 f or 3x22 f ceramic capacitors at the input (20a load). input voltage is 12v. output filtering the SLIN-20E1Ax modules are designed for low output ripple voltage and will meet the maximum output ripple specification with 0.1 f ceramic and 10 f ceramic capa citors at the output of the module. however, additional output filtering may be required by the system designer for a number of reasons. first, there may be a need to further reduce the output ripple and noise of the module. second, the dynamic response characteristics may need to be customized to a particular load step change. to reduce the output ripple and improve the dynamic resp onse to a step load change, additional capacitance at the output can be used. low esr polymer and ceramic capacitors are recommended to improve the dynamic response of the module. the figure on the next page provides output ripple information for different external capacitance values at various vo and for a full load curr ent of 20a. for stable operation of the module, limit the capacitance to less than the maximum output capacitance as specified in the electrical specification table. optimal performance of the module can be achieved by using the tunable loop tm feature described later in this data sheet.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 13 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. output filtering (continued) 0 10 20 30 40 0.51.52.53.54.55.5 output voltage (volts) ripple (mvp-p) 1x10uf external cap 1x47uf external cap 2x47uf external cap 4x47uf external cap note: output ripple voltage for various output voltages with external 1x10 f, 1x47 f, 2x47 f or 4x47 f ceramic capacitors at the output (20a load). input voltage is 12v. safety considerations for safety agency approval the power module must be inst alled in compliance with the spacing and separation requirements of the end-use safety agency standards, i.e., ul 60950-1, csa c22.2 no. 60950-1-03, and vde 0850:2001-12 (en60950-1) licensed. for the converter output to be considered meeting the requir ements of safety extra-low voltage (selv), the input must meet selv requirements. the power module has ex tra-low voltage (elv) outputs when all inputs are elv. the input to these units is to be provided with a fast-a cting fuse with a maximum rating of 20a in the positive input lead.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 14 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. remote on/off parameter min typ max unit notes signal low (unit on) 0 - 1 v signal high (unit off) active low 2.0 - vin,max v the remote on/off pin open, unit on. signal low (unit off) - - 3.5 v signal high (unit on) active high vin-1 - vin,max v the remote on/off pin open, unit on. the SLIN-20E1Ax modules feature an on/off pin for remote on/off operation. two on/off logic options are available. in the positive logic on/off option, the module turns on during a logic high on the on/off pin and turns off during a logic low. with the negative logi c on/off option, the module turns off during logic high and on during logic low. the on/off signal is always referenced to ground. for either on/off logic option, leaving the on/off pin disconnected will turn the module on when input voltage is present. for positive logic modules, the circuit configuration fo r using the on/off pin is shown below. when the external transistor q1 is in the off state, the internal pw m enable signal is pulled high through an internal 24.9k resistor and the external pullup resistor and the module is on. when transistor q1 is turned on, the on/off pin is pulled low and the module is off. a suggested value for r pullup is 20k . 23k i on/off 24.9k q1 gnd on/off vin+ _ + pwm enable v on/off module rpullup 22k q3 22k 12.1k q2 22k circuit configuration for using positive on/off logic for negative logic on/off modules, the circuit configurat ion is shown below. the on/off pin should be pulled high with an external pull-up resistor (suggested value for the 4.5v to 14v input range is 20kohms). when transistor q1 is in the off state, the on/off pin is pulled high, inte rnal transistor q2 is turned on and the module is off. to turn the module on, q1 is turned on pulling the on/off pin low, turning transistor q2 off resulting in the pwm enable pin going high and the module turning on. 24.9k q1 on/off vin+ gnd _ + pwm enable v on/off module i rpullup1 on/off 22k q2 23k 12.1k circuit configuration for using negative on/off logic
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 15 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. over current protection to provide protection in a fault (out put overload) condition, the unit is e quipped with internal current-limiting circuitry and can endure current limiting continuously. at t he point of current-limit inception, the unit enters hiccup mode. the unit operates normally once the output current is brought back into its specified range. over temperature protection to provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. the unit will shutdown if the over temperature threshold of 135c is exceeded at the thermal reference point tref. the thermal shutdown is not intended as a guarantee that the unit will survive temperatur es beyond its rating. once the unit goes into thermal shutdown it will then wait to cool before attempting to restart. input under-voltage lockout at input voltages below the input under voltage lockout limit, the module operat ion is disabled. the module will begin to operate at an input voltage above the under voltage lockout turn-on threshold. output voltage programming the output voltage of the SLIN-20E1Ax can be programmed to any voltage from 0.69dc to 5.5vdc by connecting a resistor between the trim and gnd pins of the modul e. certain restrictions appl y on the output voltage set point depending on the input voltage. these are shown in the output voltage vs. input voltage set point area plot in the figure below. the upper limit curve shows that for output voltages of 0.9v and lower, the input voltage must be lower than the maximum of 14v. the lower limit curve shows that for output voltages of 3.3v and higher, the input voltage needs to be larger than the minimum of 4.5v. 0 2 4 6 8 10 12 14 16 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 output voltage (v) input voltage (v) lower limit upper limit output voltage vs. input voltage set point area plot showing limits where the output voltage can be set for different input voltages.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 16 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. output trim equations without an external resistor between trim and gnd pins, the output of the module will be 0.69vdc. to calculate the value of the trim resistor, rtrim, for a desired output voltage, use the following equation: () ? ? ? ? ? ? ? = k vo rtrim 69 . 0 9 . 6 rtrim is the external resistor in k ? vo is the desired output voltage. table 1 provides rtrim values requi red for some common output voltages. table 1 v o, set (v) rtrim ( k ? ) 0.7 690 1.0 22.26 1.2 13.53 1.5 8.519 1.8 6.216 2.5 3.812 3.3 2.644 5.0 1.601 by using a 0.5% tolerance trim resistor with a tc of 100ppm, a set point tolerance of 1.5% can be achieved as specified in the electrical specification. remote sense the SLIN-20E1Ax power modules have a remote sense featur e to minimize the effects of distribution losses by regulating the voltage between the s+ and s? pins. the voltage between the s? and gnd pins of the module must not drop below ?0.2v. if remote sense is bei ng used, the voltage between s+ and s? cannot be more than 0.5v larger than the voltage between vout and gnd. note that the output voltage of the module cannot exceed the specified maximum value. when the remote sense feature is not being us ed, connect the s+ pin to the vout pin and the s? pin to the gnd pin. circuit configuration for programming out put voltage using an external resistor
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 17 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. startup into pre-biased output the SLIN-20E1Ax modules can start into a prebiased output as long as the prebias voltage is 0.5v less than the set output voltage. note that prebias operation is not supported when output voltage sequencing is used. voltage margining output voltage margining can be implemented in the SLIN-20E1Ax modules by connecting a resistor, r margin-up , from the trim pin to the ground pin for margining- up the output voltage and by connecting a resistor, r margin-down , from the trim pin to output pin for margining-down. vo module gnd trim q1 rtrim rmargin-up q2 rmargin-down circuit configuration for margining output voltage monotonic start-up and shutdown the SLIN-20E1Ax modules have monotonic start-up and s hutdown behavior for any combination of rated input voltage, output current and operating temperature range. output voltage sequencing the SLIN-20E1Ax modules include a sequencing feature t hat enables users to implemen t various types of output voltage sequencing in their applications. this is acco mplished via an additional sequencing pin. when not using the sequencing feature, either tie the seq pin to vin or leave it unconnected. when an analog voltage is applied to the seq pin, the out put voltage tracks this voltage until the output reaches the set-point voltage. the final value of the seq volt age must be set higher than the set-point voltage of the module. the output voltage follows the voltage on the seq pin on a one-to-one volt basis. by connecting multiple modules together, multiple modules can tra ck their output voltages to the voltage applied on the seq pin. for proper voltage sequencing, first, input voltage is applie d to the module. the on/off pin of the module is left unconnected (or tied to gnd for negative logic modules or tied to vin for positive logic modules) so that the module is on by default.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 18 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. output voltage sequencing (continued) after applying input voltage to the module, a minimum 10msec delay is required before applying voltage on the seq pin. during this time, a voltage of 50mv ( 20 mv) is maintained on the seq pin. this can be done by applying the sequencing voltage through a resistor r1 connected in series with the seq pin. this delay gives the module enough time to complete its in ternal power-up soft-start cycle. during the delay time, the seq pin should be held close to ground (nominally 50m v 20 mv). this is required to keep the internal op- amp out of saturation thus preventing output overshoot during the start of the sequencing ramp. by selecting resistor r1 according to the following equation: 05 . 0 24950 1 ? = in v r the voltage at the sequencing pin will be 50mv when the sequencing signal is at zero. r1 gnd vin+ seq + - out 10k 499k module circuit showing connection of the sequencing signal to the seq pin after the 10msec delay, an analog voltage is applied to the seq pin and the output voltage of the module will track this voltage on a one-to-one volt basis until the out put reaches the set-point voltage. to initiate simultaneous shutdown of the modules, the seq pin vo ltage is lowered in a controlled manner. the output voltage of the modules tracks the volt ages below their set-point voltages on a one-to-one basis. a valid input voltage must be maintained until the tracking and output voltages reach ground potential. when using the sequencing feature to control start-up of the module, pre-bias i mmunity during start-up is disabled. the pre-bias immunity f eature of the module relies on the module being in the diode-mode during start- up. when using the sequencing feature, modules goes thro ugh an internal set-up time of 10msec, and will be in synchronous rectification mode when the vo ltage at the seq pin is applied. this will result in the module sinking current if a pre-bias voltage is present at the output of the module. when pre-bias immunity during start-up is required, the sequencing feature must be disabled. for additional guidelines on using the sequencing feature please contact the bel power technical representative for additional information. ohms
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 19 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. power good the SLIN-20E1Ax modules provide a power good (pgood ) signal that is implemented with an open-drain output to indicate that the output voltage is within th e regulation limits of the power module. the pgood signal will be de-asserted to a low state if any condition such as over temperature, over cu rrent or loss of regulation occurs that would result in the output voltage going 11% outside the set point value. the pgood terminal should be connected through a pull-up resistor (suggested value 100k ) to a source of 6vdc or less. synchronization the SLIN-20E1Ax modules can be synchronized using an external signal. details of the sync signal are provided in the electrical specifications table. if t he synchronization function is not being used, leave the sync pin floating. tunable loop tm the SLIN-20E1Ax modules have a new feature that optim izes transient response of the module called tunable loop tm . external capacitors are usually added to the output of the module for two reasons: to reduce output ripple and noise and to reduce output voltage deviations from the st eady-state value in the presence of dynamic load current changes. adding external capacitance however a ffects the voltage control loop of the module, typically causing the loop to slow down with sluggish response. larger values of external capacitance could also cause the module to become unstable. the tunable loop tm allows the user to externally adjust the vo ltage control loop to match the filter network connected to the output of the module. the tunable loop tm is implemented by connecting a series r-c between the sense and trim pins of the module, as shown below. this r-c allows the user to externally adjust the voltage loop feedback compensation of the module. module vout sense trim gnd rtune ctune rtrim c o circuit diagram showing connection of r tune and c tune to tune the control loop of the module recommended values of r tune and c tune for different output capacitor combin ations are given in tables 2 and 3. table 2 shows the recommended values of r tune and c tune for different values of ceramic output capacitors up to 940uf that might be needed for an application to m eet output ripple and noise requirements. selecting r tune and c tune according to table 2 will ensure stable operation of the module. in applications with tight output voltage limits in the presence of dynamic current loading, additional output capacitance will be required. table 3 lists recommended values of r tune and c tune in order to meet 2% output voltage deviation limits for some common output voltages in the presence of a 10a to 20a step change (50% of full load), with an input voltage of 12v.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 20 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. tunable loop tm (continued) table 2 .general recommended values of r tune and c tune for vin=12v and various external ceramic capacitor combinations. co 1x47 f 2x47 f 4x47 f 10x47 f 20x47 f r tune 240 240 240 150 150 c tune 1500pf 2700pf 5600pf 12nf 15nf table 3 .recommended values of r tune and c tune to obtain transient deviation of 2% of vout for a 10a step load with vin=12v. vo 5v 3.3v 2.5v 1.8v 1.2v 0.69v co 6x47 f 5x47 f + 330 f polymer 2x330 f polymer 6x47 f + 2x 330 f polymer 6x47 f + 4x330 f polymer 12x330 f polymer r tune 220 220 200 150 150 150 c tune 5600pf 7500pf 18nf 33nf 120nf 120nf v 99mv 66mv 50mv 36mv 24mv 12mv thermal considerations power modules operate in a variety of thermal envir onments; however, sufficient cooling should always be provided to help ensure reliable operation. considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. a reduction in the operating temperature of the module will result in an increase in reliability. the thermal data presented here is based on physical meas urements taken in a wind tunnel. the test set-up is shown below. a i r flow x power module w ind tunnel pwbs 12.7_ (0.50) 76.2_ (3.0) probe location for measuring airflow and ambient temperature 25.4_ (1.0) thermal test setup
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 21 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. thermal considerations (continued) the preferred airflow direction and the thermal reference points, t ref , used in the specifications are shown below. for reliable operation the temperatures at these points should not exceed 125 o c. the output power of the module should not exceed the rated powe r of the module (vo,set x io,max). preferred airflow direction and locati on of hot-spot of the module (tref). example application circuit requirements: vin: 12v vout: 1.8v iout: 15a max., worst case load transient is from 10a to 15a vout: 1.5% of vout (36mv) for worst case load transient vin, ripple 1.5% of vin (180mv, p-p) module trim vout s+ rtune gnd ctune rtrim co1 vin + ci2 ci1 vout+ vin+ q1 on/off s- + co2 ci1 2 x 22 f/16v ceramic capacitor (e.g. murata grm32er61c226ke20) ci2 200 f/16v bulk electrolytic co1 5 x 47 f/6.3v ceramic capacitor (e.g. murata grm31cr60j476me19) co2 2 x 330 f/6.3v polymer (e.g. sanyo, poscap) ctune 22nf ceramic capacitor (can be 1206, 0805 or 0603 size) rtune 150 ohms smt resistor (can be 1206, 0805 or 0603 size) rtrim 6.19k smt resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 22 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. mechanical outline top view side view
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 23 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. mechanical outline (continued) recommended pad layout dimensions are in millimeters and (inches). tolerances: x.x mm 0.5 mm (x.xx in. 0.02 in.) [unless otherwise indicated] x.xx mm 0.25 mm (x.xxx in 0.010 in.) note: this module is recommended and compatible with pb-free reflow soldering and must be soldered using a reflow profile with a peak temperature of no more than 260oc for less than 5 seconds. pin function 1 on/off 2 vin 3 seq 4 gnd 5 vout 6 trim 7 s+ 8 s- 9 pgood 10 sync
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 24 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. packaging details the SLIN-20E1Ax modules are supplied in tape & reel as standard. all dimensions are in m illimeters and (in inches). reel dimensions: outside dimensions: 330.2 mm (13.00??) inside dimensions: 177.8 mm (7.00?) tape width: 24.00 mm (0.945?)
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 25 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. surface mount information pick and place the SLIN-20E1Ax modules use an open frame construc tion and are designed for a fully automated assembly process. the modules are fitted with a label designe d to provide a large surface area for pick and place operations. the label meets all the requirements for su rface mount processing, as well as safety standards, and is able to withstand reflow temperatures of up to 300 o c. the label also carries product information such as part number and serial number. nozzle recommendations the module weight has been kept to a minimum by using open frame construction. variables such as nozzle size, tip style, vacuum pressure and placement speed sh ould be considered to optimize this process. the minimum recommended inside nozzle diameter for reli able operation is 3mm. the maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 7 mm. lead free soldering the SLIN-20E1Ax modules are lead-free (pb-free) and rohs compliant and fully compatible in a pb-free soldering process. failure to observe the instructions below may result in the failure of or cause damage to the modules and can adversely affect long-term reliability. pb-free reflow profile power systems will comply with j-std-020 rev. c (moistur e/reflow sensitivity classification for nonhermetic solid state surface mount devices) for both pb-free sold er profiles and msl classification procedures. this standard provides a recommended forced-air-convection refl ow profile based on the volume and thickness of the package. the suggested pb-free solder paste is sn/ag/ cu (sac). the recommended linear reflow profile using sn/ag/cu solder is shown in the figure below. solder ing outside of the recommended profile requires testing to verify results and performance. msl rating the SLIN-20E1Ax modules have a msl rating of 2. storage and handling the recommended storage environment and handling procedur es for moisture-sensitive surface mount packages is detailed in j-std-033 rev. a (handling, packing, sh ipping and use of moisture/reflow sensitive surface mount devices). moisture barrier bags (mbb) with desicc ant are required for msl ratings of 2 or greater. these sealed packages should not be broken until time of use. on ce the original package is broken, the floor life of the product at conditions of 30c and 60% relative humidity varies according to the msl rating (see j-std-033a). the shelf life for dry packed smt packages will be a minimu m of 12 months from the bag seal date, when stored at the following conditions: < 40 c, < 90% relative humidity. per j-std-020 rev. c 0 50 100 150 200 250 300 reflow time (seconds) reflow temp (c) heating zone 1c/second peak temp 260c * min. time above 235c 15 seconds *time above 217c 60 seconds cooling zone recommended linear reflow profile using sn/ag/cu solder.
? 2009 bel fuse inc. specifications subject to change without notice 12/10/10 26 corporate far east europe bel fuse inc. bel fuse ltd. bel fuse europe ltd. 206 van vorst street 8f/ 8 luk hop street preston technology management centre jersey city, nj 07302 san po kong marsh lane, suite g7, preston tel 201-432-0463 kowloon, hong kong lancashire, pr1 8ud, u.k. fax 201-432-9542 tel 852-2328-5515 tel 44-1772-556601 www.belfuse.com fax 852-2352-3706 fax 44-1772-888366 www.belfuse.com www.belfuse.com non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.69 vdc - 5.5 vdc /20 a outputs december 10, 2010 bel power, inc. , a subs idiary of bel fuse, inc. surface mount information (continued) post solder cleaning and drying considerations post solder cleaning is usually the final circuit-board as sembly process prior to elec trical board testing. the result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. revision history date revision changes detail approval 2009-6-10 a first release t. bubriski 2009-6-25 b section ?surface mount information? added. t. bubriski 2009-9-1 c tunable loop tm logo added. t. bubriski 2009-10-8 d updated startup time wa veforms on page 10. t. bubriski 2010-1-19 e updated remote on/off table on page 14. t. bubriski 2010-3-16 f updated derating curves on page 6. t. bubriski 2010-12-10 g updated the start-up waveforms on page 8 and the power good and tunable loop tm sections on page 19. t. bubriski rohs compliance complies with the european directive 2002/95/e c, calling for the elimination of lead and other hazardous substances from electronic products.

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