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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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. features ? wide input voltage range ? output voltage sequencing ? monotonic start-up ? over temperature protection ? negative remote on/off ? output over current protection ? true differential remote sense ? tunable loop tm (a registered trademark of lineage powe r systems) to optimize dynamic output voltage response ? parallel operation with active current sharing ? compliant to rohs eu directive 2002/95/ec ? ul * 60950 recognized, csa? c22.2 no. 60950-1-07 certified ? vde ? 0805 (en60950 - 1 2 nd edition) licensed applications ? distributed power architectures ? telecommunications equipment ? intermediate bus voltage applications ? industrial applications description the SLIN-50E1AL power modules are non-isolated dc/dc conver ters that can deliver up to 50 a of output current. these modules operate over a wide range of input volt age (vin = 4.5 vdc-14 vdc) and provide a precisely regulated output voltage from 0.7 vdc to 2.0 vdc, progr ammable via an external resistor. features include remote on/off, adjustable output voltage, over curren t and over temperature pr otection, output voltage sequencing and paralleling. a new feature, the tunable loop tm , allows the user to optimize the dynamic response of the converter to match the load with redu ced amount of output capacitance leading to savings on cost and pwb area. part selection output voltage input voltage max. output current typical efficiency model number active low 0.7 vdc - 2 vdc 4.5 vdc - 14 vdc 50 a 87% SLIN-50E1AL notes: add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation s lin ? 50 e 1a l 1 2 3 4 5 6 1---surface mount 4--- wide input voltage range (4.5-14v) 2---series code 5--- wide output voltage range (0.7-2v) 3---output current (50a) 6--- enable, active low SLIN-50E1AL rohs com p liant rev. a
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. absolute maximum ratings parameter min typ max unit notes continuous input voltage -0.3 - 14 v sequencing pin voltage -0.3 - 4 v operating ambient te mperature -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) - - 26 a v in = v in,min to v in,max , i o = i o,max - 73.4 - ma vo=0.7v, v in = v in,mon , i o =0 module enabled input current (no load) - 136 - ma vo=1.8v, v in = v in,mon , i o =0 module enabled input stand-by current - 1.3 - ma v in = v in,mon , module disabled input reflected ripple current (pk-pk) - - 73 ma 5hz to 20mhz, 1 h source impedance; v in,min to v in,max, i o = i omax i 2 t inrush current transient - - 1 a 2 s input ripple rejection (120hz) - 50 - db turn-on threshold - 4.26 - v turn-off threshold - 4.04 - v hysteresis - 0.22 - 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 surface mount, fast acting fuse with a maximum rating of 30a. based on the information provided in this data sheet on inrush energy and maximum dc input current, 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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. output specifications parameter min typ max unit notes output voltage set point -1.0 - +1.0 %vo,set v in =v in,nom , i o =i o, nom, t ref =25c. output voltage -2.0 - +2.0 %vo,set over all operating input voltage, resistive load, and temperature conditio ns until end of life adjustment range 0.7 - 2.0 v selected by an external resistor remote sense range - - 0.5 v load regulation - - 8 mv i o =i o, min to i o, max line regulation - - 5 mv v in =v in, min to v in, max temperature regulation (-40c to 85c) - - 8 mv t ref =t a, min to t a, max ripple and noise (pk-pk) - - 50 mv 5hz to 20mhz bw, v in =v in, nom and i o =i o, min to i o, max , co = 1 f // 10 f ceramic capacitors output current range 0 - 50 a output dc current limit - 180 - %io,max hiccup mode output short-circuit current - 5.5 - a vo 250mv, hiccup mode output capacitance esr 1 m ? esr 10 m ? esr 1 m ? esr 10 m ? - - - - - - - - 1200 10000 20000 20000 uf uf uf uf without the tunable loop tm without the tunable loop tm with the tunable loop tm with the tunable loop tm - 4.8 - ms case 1 : on/off input is set to logic low (module on) 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 - 4.8 - ms case 2: input power is applied for at least one second and then the on/off input is set to logic low (delay from instant at which von/off=0.3v until vo=10% of vo, set) output voltage rise time - 3.6 - ms time for vo to rise from 10% of vo, set to 90% of vo, set output voltage overshoot - - 3 %vo,set i o =i o, max ,v in =4.5 to 14vdc, t a =25c 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 4 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. general specifications parameter min typ max unit notes efficiency vo=0.7v vo=1.2v vo=1.8v - - - 81.1 87.0 90.1 - - - % % % vin= 12vdc, t a =25c io=io, max , vo= vo,set switching frequency - 260 - khz over temperature protection - 125 - c sequencing slew rate capability - - 2 v/ms v in, min to v in, max ; i o, min to i o, max vseq < vo 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: 1v/ms - - 100 200 200 400 mv mv v in, min to v in, max ; i o, min - i o, max vseq < vo pgood (power good) internal pull-up, v pgood overvoltage threshold for pgood undervoltage threshold for pgood - - - 5 112.5 87.5 - - - v %vo,set %vo,set forced load share accuracy - 10 - %io number of units in parallel - - 5 - weight - 14.22 - g mtbf 4,755,661 hours calculated mtbf (i o =i o , max , ta=40c) per telecordia issue 2, method i, case 3 dimensions inches (l w h) millimeters (l w h) 1.30 x 0.90 x 0.34 33 x 22.9 x 10 - 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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. efficiency data 70 75 80 85 90 9 5 0 1020304050 vin =4.5v vin=12v vin=14v 70 75 80 85 90 95 0 1020304050 vin =4.5v vi n=12v vin =14v efficiency, vo=0.7v, t a =25c vo=1.2v, t a =25c 70 75 80 85 90 95 100 0 1020304050 vin =12v vin =4.5v vi n =14v efficiency, (%) output current, i o (a) vo=1.8v, t a =25c
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. thermal derating curves 25 30 35 40 45 50 55 35 45 55 65 75 85 2m/s ( 4 00 lfm) 1. 5m/ s (300lfm) 1m /s ( 20 0l fm ) 0. 5m/ s (100lfm) nc 25 30 35 40 45 50 55 35 45 55 65 75 85 2m/ s (400lfm) 1. 5m/ s ( 3 00 lfm) 1m/s ( 2 00 lfm) 0.5m/s (100lfm) nc output current, io ( a ) ambient temperature, t a o c output current, io ( a ) ambient temperature, t a o c vo=0.7v, vin=12v vo=1.2v, vin=12v 25 30 35 40 45 50 5 5 35 45 55 65 75 85 2m/ s (400lfm) 1. 5m/ s (300lfm) 1m/s (200lfm) 0.5m/s (100lfm) nc output current, io (a) ambient temperature, t a o c vo=1.8v, vin=12v
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary 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 ) ( 10mv/div ) time, t (1 s/div) vo=0.7v, t a =25c , vin=12v, io = io,max vo=1.2v, ta=25c , vin=12v, io = io,max output voltage v o (v) (10mv/div) time, t (1 s/div) vo=1.8v, ta=25c , vin=12v, 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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. transient response waveforms tbd output current, output voltage i o ( a ) ( 2a/div ) v o ( v ) ( 200mv/div ) time, t (20 s /div) output current, output voltage i o ( a ) ( 10a/div ) v o ( v ) ( 5mv/div ) time, t (0.5ms /div) transient response to dynamic load change from 0% to 50% to 0%. vo=0.7v, ta=25c , vin=12v transient response to dynamic load change from 50% to 100%. vo=1.2v, ta=25c, vin=12v, cext =5x47uf+ +13x330ufpolymer,ctune=120nf,rtune=180ohms output current, output voltage i o (a) (10a/div) v o (v) (10mv/div) time, t (0.5ms /div) transient response to dynamic load change from 50% to 100%. vo=1.8v, ta=25c, vin=12v, cext =5x47uf+ +8x330ufpolymer,ctune=47nf,rtune=220ohms
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. startup time output voltage on/off voltage vo ( v ) ( 200mv/div ) v on/off ( v ) ( 5v/div ) time, t (2 ms/div) output voltage on/off voltage vo ( v ) ( 500mv/div ) v on/off ( v ) ( 5v/div ) time, t (2 ms/div) start-up using on/off voltage (io = io,max) vo=0.7v, vin = 12v, ta=25c start-up using on/off voltage (i o = i o,max ) vo=1.2v, vin = 12v, ta=25c output voltage on/off voltage vo (v) (500mv/div) v on/off (v) (5v/div) time, t (2 ms/div) start-up using on/off voltage (i o = i o,max ) vo=1.8v, vin = 12v, ta=25c
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. startup time (continued) output voltage input voltage vo ( v ) ( 200mv/div ) v in ( v ) ( 5v/div ) time, t (2 ms/div) output voltage input voltage vo ( v ) ( 500mv/div ) v in ( v ) ( 5v/div ) time, t (2 ms/div) start-up using input voltage (v in = 12v, io = i o,max ), vo=0.7v, ta=25c start-up using input voltage (v in = 12v, i o = i o,max ), vo=1.2v, ta=25c output voltage input voltage vo(v) (500mv/div) v in (v) (5v/div) time, t (2 ms/div) start-up using input voltage (v in = 12v, i o = i o,max ), vo=1.8v, ta=25c
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. test configurations input reflected ripple current test setup. to oscilloscope current probe l te s t 1 h battery c s 1000 f electrolytic e.s.r.<0.1 @ 20 c 100kh z 2x100 f tantalum v in (+) com note: measure input reflected ripple current with a simulated source inductance (l tes t ) of 1 h. capac itor c s offsets possible battery impedance. measure current as shown above. c in output ripple and noise test setup. note: all voltage measurem ents to be take n at the m odu le te rmin als, a s shown above. if sockets are used the n kelvi n conn ection s are r equired a t the mod ule ter mi nals to avoid me asureme nt error s due to socket co ntact r es i sta n ce . vo+ com 0.1uf resistive load scope using bnc sock et cop per strip g round plane 10uf output voltage and efficiency test setup. v o co m v in (+) com r lo ad r contact r di s tri b uti o n r contact r di s tri b uti o n r co ntac t r co ntac t r d istr ibu tion r d istr ibu tion v in v o n ote: all voltag e m easurem ent s to b e ta ken at th e m odule termin als, as sh own ab ove. if sockets are use d th en kelvin co nnect io ns are req uired a t th e m odule termina ls to avoid m easu re men t errors due to s ocket co ntact 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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. input filtering the SLIN-50E1AL module should be connected to a low ac -impedance source. a highly inductive source can affect the stability of the module. an input capacitor mu st be placed directly adjacen t to the input pin of the module to minimize input ripple voltage and ensure module stability. 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 vo ltages at maximum load current with 2x22f, 4x22 f or 4x47 f ceramic capacitors and an input of 12v. input ripple voltage (mvp-p) 50 75 100 125 150 175 200 225 250 1 1.25 1.5 1.75 2 2x22uf 4x22uf 4x47uf output voltage (vdc) output filtering the SLIN-50E1AL 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 t he 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 dy namic 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. for stabl e operation of the module, limit t he capacitance to less than the maximum output capacitance as specified in the electrical specific ation table. optimal performance of the module can be achieved by using the tunable loop feature described late r in this data sheet. the figure below shows the output ripple voltage for various output voltages with external 2x10f, 2x47 f, 4x47 f or 8x47 f ceramic capacitors at the input voltage of 12v. 0 10 20 30 40 50 60 70 80 1 1.2 1.4 1.6 1.8 2 ripple (mvp-p) output voltage(volts) 2x10uf ext cap 2x47uf ext cap 4x47uf ext cap 8x47uf ext cap
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. 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 2nd edition, csa c22.2 no. 60950-1-07, din en 60950-1:2006 + a11 (vde0805 teil 1 + a11):2009-11; en 60950-1 :2006 + a11:2009-03. 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 ac ting fuse with a maximum rating of 30a in the positive input lead. remote on/off parameter min typ max unit notes signal low (unit on) -0.3 - 0.6 v signal high (unit off) active low 3.0 - vin,max v the remote on/off pin open, unit off. the SLIN-50E1AL power modules feature an on/off pin for remote on/off operation. if not using the on/off pin, connect the pin to ground (the module will be on). the on/off signal (v on/off ) is referenced to ground. the circuit configuration for remote on/off operation of the module using the on/off pin is shown below. during a logic high on the on/off pin (transistor q1 is off), the module remains off. the external resistor r1 should be chosen to maintain 3.0v minimum on the on/o ff pin to ensure that the module is off when transistor q1 is in the off state. suitable values for r1 are 4.7k for input voltage of 12v and 3k for 5vin. during logic- low when q1 is turned on, the module is turned on. the on/off pin can also be used to synchronize the out put voltage start-up and shutdown of multiple modules in parallel. by connecting on/off pins of multiple modules , the output start-up can be synchronized (please refer to characterization curves). over current protection to provide protection in a fault (output overload) c ondition, the unit should be equipped with internal current-limiting circuitry and can endure current limiting c ontinuously. at the point of current-limit inception, the unit enters hiccup mode. the unit operates normally once t he output current is brought back into its specified range. remote on/off implementation using on/off q1 gnd pwm enable on/off vin+ on/off _ + i v module r1 on/off 5.11k 5.11k
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. 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 125c is exceeded at the thermal reference point t ref . 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-50E1AL can be programmed to any voltage from 0.7vdc to 2.0vdc by connecting a single resistor (shown as r trim in the figure below) between trim + and trim- pins of the module. the following equation will be used to set the output voltage of the module: ? ? ? ? ? ? ? = 7 . 0 14000 vo r trim rtrim is the external resistor in ? vo is the desired output voltage 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. table 1 provides rtrim values required for some common output voltages. table 1 v o (+) trim+ gnd r trim load v in (+) on/off vout trim ? circuit configuration to program output voltage using an external resistor v o, set (v) rtrim ( k ? ) 0.7 open 1.0 46.6 1.2 28 1.5 17.5 1.8 12.7
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. remote sense the SLIN-50E1AL power modules have differential remote se nse to minimize the effects of distribution losses by regulating the voltage at the remo te sense pin. the voltage between the sense pin and vout pin must not exceed 0.5v. note that the output voltage of the module cannot exceed the specified maximum value. this includes the voltage drop between the sense and vout pins . when the remote sense feature is not being used, connect the sense pin to the vout pin . voltage margining output voltage margining can be implemented in the SLIN-50E1AL 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. t he figure below shows the circui t configuration for output voltage margining. circuit configuration for margining output voltage monotonic start-up and shutdown the SLIN-50E1AL modules have monotonic start-up and shut down behavior for any combination of rated input voltage, output current and operating temperature range. startup into pre-biased output the SLIN-50E1AL 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 . vo module trim? trim+ q1 rtrim rmargin-up q2 rmargin-down
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. output voltage sequencing the SLIN-50E1AL modules include a sequencing feature that enables users to implement various types of output voltage sequencing in their applications. this is acco mplished via an additional sequencing pin. when not using the sequencing feature, 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 basis. by connecting multiple modules together, multiple modules can track 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 so that the module is on by default. after applying input voltage to the module, a minimum 10msec delay is required before applying vo ltage on the seq pin. alternatively, input voltage can be applied while the unit is off and then the unit can be enabled. in this case the seq signal must be applied 10ms after the unit is enabled. this delay gives the module enou gh time to complete its internal power-up soft-start cycle. during the delay time, the seq pin may be held to ground. 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 representatives for additional information. power good the SLIN-50E1AL modules provide a power good (pgood) si gnal to indicate that the output voltage is within the regulation limits of the power modul e. the pgood signal will be de-assert ed to a low state if any condition such as over-temperature, over-current or loss of regulation occurs that would result in the output voltage going 12.5% outside the set point value. the pgood terminal is internally pulled-up and provides a voltage of ~5v, when asserted, thus eliminating the need fo r an external source and pull-up 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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. active load sharing for additional power requirements, the SLIN-50E1AL power module is also avail able with a parallel option. up to five modules can be configured, in parallel, with active load sharing. good layout techniques should be observed when using mult iple units in parallel. to implement forced load sharing, the following connections should be made: ? the share pins of all units in parallel must be conne cted together. the path of these connections should be as direct as possible. ? all remote-sense pins should be connected to the po wer bus at the same point, i.e., connect all the sense(+) pins to the (+) side of the bus. close pr oximity and directness are necessary for good noise immunity. some special considerations apply for desig n of converters in parallel operation: ? when sizing the number of modules required for paralle l operation, take note of the fact that current sharing has some tolerance. in addition, under transient conditions such as a dynamic load change and during startup, all converter output currents will not be equal. to allow for such variation and avoid the likelihood of a converter shutting off due to a current overload, the total capacity of the paralleled system should be no more than 75% of the sum of the individual converters . as an example, for a system of four SLIN-50E1AL converters in parallel, the total current drawn shoul d be less that 75% of (4 x 50a), i.e. less than 150a. ? all modules should be turned on and off together. this is so that all modules come up at the same time avoiding the problem of one converter sourcing current into the other leading to an over current trip condition. to ensure that all modules come up simultaneously, the on/ off pins of all paralleled converters should be tied together and the converters enabled and disabled using the on/off pin. ? the share bus is not designed for redundant operatio n and the system will be non-functional upon failure of one of the unit when multiple units are in parallel. in particular, if one of the converters shuts down during operation, the other converters may also shut down due to their outputs hitting current limit. in such a situation, unless a coordi nated restart is ensured, the system may never properly restart since different converters will try to restart at different times caus ing an overload condition and subsequent shutdown. this situation can be avoided by having an external output voltage monitor circuit that detects a shutdown condition and forces all converters to shut down and restart together. tunable loop tm the SLIN-50E1AL 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. this r-c allows the user to externally adjust the voltage loop feedback compensation of the module.
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. tunable loop tm (continued) rtune gnd trim+ module trim- rtrim sense+ co1 sense- vout ctune 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 1000uf that might be needed for an application to meet 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 25a to 50a step change (50% of full load), with an input voltage of 12v. table 2 .general recommended values of r tune and c tune for vin=12v and various external ceramic capacitor combinations. c o 1 x 47uf 2x47uf 4x47uf 6x47uf 10 x 47u f 20 x 47uf r tune 330 330 330 330 270 270 c tune 330pf 560pf 1200pf 1800pf 2200pf 5600pf table 3 .recommended values of r tune and c tune to obtain transient deviation of 2% of vout for a 25a step load with vin=12v. v o 1.8v 1.2v 0.7v c o 5x47uf + 8x330uf polymer 5x47uf + 13x330uf polymer 5x47uf + 22x330uf polymer r tune 220 180 100 c tune 47nf 120nf 330nf ? v 35mv 23mv 14mv
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. 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. thermal test setup the thermal reference points, t ref used in the specifications is shown below. for reliable operation the temperatures at this point should not exceed 125 o c. the output power of the modul e should not exceed the rated power of the module (vo,set x io,max). preferred airflow direction and locati on of hot-spot of the module (tref). air flow x power module wind tunnel pwbs 12.7_ (0.50) 76.2_ (3.0) probe location for measuring airflow and ambient temperature 25.4_ (1.0)
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. example application circuit requirements: vin: 12v vout: 1.8v iout: 37.5a max., worst case load transient is from 25a to 37.5a vout: 1.5% of vout (27mv) for worst case load transient vin, ripple 1.5% of vin (180mv, p-p) ci1 4x22 f/16v ceramic capacitor (e.g. murata grm32er61c226ke20) ci2 200 f/16v bulk electrolytic co1 5x47 f/6.3v ceramic capacitor (e.g. murata grm31cr60j476me19) co2 8x 330 f/6.3v polymer (e.g. sanyo poscap) ctune 47nf ceramic capacitor (can be 1206, 0805 or 0603 size) rtune 220 ohms smt resistor (can be 1206, 0805 or 0603 size) rtrim 12.7k smt resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%) vout+ vin se- rtrim vout trim + sense + ctune seq rtune trim- sense- + ci2 vin+ co1 ci1 + co2 on/off module gnd pgood
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. mechanical outline
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary 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.) pin define pin# function 1 vin 2 gnd 3 vout 4 vout 5 gnd 6 vin 7 seq 8 pgood 9 on/off 10 vs- 11 vs+ 12 +trim 13 ?trim 14 share
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. packaging details the SLIN-50E1AL modules are supplied in tape & reel as standard. all dimensions are in millimeters and (in inches). reel dimensions: outside dimensions: 330.2 mm (13.00??) inside dimensions: 177.8 mm (7.00?) tape width: 56.00 mm (2.20?)
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. surface mount information pick and place the SLIN-50E1AL modules use an open frame construc tion and are designed for a fully automated assembly process. the modules are fitted with a label designed to provide a large surface area for pick and place operations. the label meets all the requirements for surf ace 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. pick and place location. nozzle recommendations the module weight has been kept to a minimum by us ing open frame construction. even so, these modules have a relatively large mass when compared to conventional smt components. variables such as nozzle size, tip style, vacuum pressure and pick & placement speed should be considered to optimize this process. the minimum recommended inside nozzle diameter for reliable operation is 3mm. the maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 5 mm max. bottom side assembly this module is not recommended for assembly on the bottom side of a customer board. if such an assembly is attempted, components may fall off the module during the second reflow process. if assembly on the bottom side is planned, please contact bel power for special manufacturing process instructions. lead free soldering the SLIN-50E1AL modules are lead-free (pb-free) and rohs compliant and are both forward and backward compatible in a pb-free and a snpb soldering process. failure to observe the instructions may result in the failure of or cause damage to the modules an d can adversely affect long-term reliability.
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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. surface mount information (continued) pb-free reflow profile power systems will comply with j-std-020 rev. c (moist ure/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 reflow 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 below. per j-std-020 rev. c 0 50 100 150 200 250 300 reflow time (seconds) reflow temp (c) heati ng zone 1c/secon d peak temp 260c * min. time above 235c 15 seconds *time above 217c 60 seconds cooling zone 4c/second note: soldering outside of the recommended profile requires testing to verify results and performance. tin lead soldering the SLIN-50E1AL power modules are lead free modules and can be soldered either in a lead-free solder process or in a conventional tin/lead (sn/pb) process. it is recommended that the customer review data sheets in order to customize the solder reflow profile for each application board assembly. the following instructions must be observed when soldering these units. failure to observe these instructions may result in the failure of or cause damage to the modules, and can adversely affect long-term reliability. in a conventional tin/lead (sn/pb) solder process peak reflow temper atures are limited to less than 235 o c. typically, the eutectic solder melts at 183 o c, wets the land, and subsequently wicks the device connection. sufficient time must be allowed to fuse the plating on the connection to ensure a reliable solder joint. there are several types of smt reflow technolog ies currently used in the industry. these surface mount power modules can be reliably soldered using natural forced convection, ir (radiant infrared), or a combination of convection/ir. for reliable soldering the solder reflow profile should be established by accurately measuring the modules cp connector temperatures. reflow temp ( c) 0 50 10 0 15 0 200 250 300 p reheat zo ne max 4 o cs -1 so ak zo ne 30-240s heat zone max 4 o cs -1 p eak temp 235 o c cooling zo ne 1- 4 o cs -1 t lim above 205 o c max temp solder ( c) 200 205 210 215 220 225 230 235 240 0 10 203040 5060 reflow time (s) reflow profile for tin/lead (sn/pb) process time limit curve above 205 o c reflow for tin lead (sn/pb) process
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 26 non-isolated dc/dc converters 4.5 vdc - 14 vdc input, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. surface mount information (continued) msl rating the SLIN-50E1AL 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 mini mum of 12 months from the bag seal date, when stored at the following conditions: < 40 c, < 90% relative humidity. post solder cleaning and drying considerations post solder cleaning is usually the final circuit-board assemb ly process prior to electrical 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.
? 2011 bel fuse inc. specifications subject to change without notice. 021811 27 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, 0.7 vdc ? 2 vdc /50 a outputs february 18, 2011 bel power inc., a subsid iary of bel fuse inc. revision history date revision changes detail approval 2011-2-15 a first release 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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