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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 3vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subs idiary of bel fuse, inc. features ? wide input voltage range ? ability to sink and source current ? fixed switching frequency ? cost efficient open frame design ? power good signal ? over temperature protection ? remote sense ? output over current protection ? remote on/off ? output voltage programmable ? tunable loop tm (a registered trademark of lineage power systems) to optimize dynamic output voltage response ? 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 applications description the slin-02e2ax power modules are non-isolated dc-dc conver ters that can deliver up to 2a of output current. these modules operate over a wide range of input voltage (v in = 3vdc-14vdc) and provide a precisely regulated output voltage from 0.6vdc to 5.5vdc, programmable via an external resistor. features include remote on/off, adjustable output voltage, and over current and over temperature protection. a new feature, the tunable loop tm , allows the user to optimize the dynamic response of the converter to match the load with reduced amount of output capacitance leading to savings on cost and pwb area. part selection output voltage input voltage max. output current max. output power typical efficiency model number active high model number active low 0.6 vdc - 5.5 vdc 3 vdc - 14 vdc 2 a 11 w 93.6% SLIN-02E2A0 slin-02e2al notes: add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation s lin ? 02 e 2a 0 1 2 3 4 5 6 1---surface mount 4--- wide input voltage range (3-14v) 2---series code 5--- wide output vo ltage range (0.6-5.5v) 3---output current (2a) 6--- enable, active high, change ?0? to ?l? means active low ? distributed power architectures ? ? intermediate bus voltage applications ? networking equipment ? telecommunications equipment ? industrial equipment slin-02e2ax rohs com p liant rev.b
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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. absolute maximum ratings parameter min typ max unit notes continuous input voltage -0.3 - 15 v operating ambient tem perature -40 - 85 c storage temperature -55 - 125 c note: stresses in excess of the absolute maximum ratings can cause permanent damage to the device. these are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operati ons 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 3.0 - 14 v input current (full load) - - 1.8 a v in =3v to 14v input current (no load) vo=0.6v vo=5.5v - - 20 48 - - ma ma v in =12v, i o = 0, module enabled input stand-by current - 8 - ma v in = 12.0vdc, module disabled input reflected ripple current (pk-pk) - 20 - ma 5hz to 20mhz, 1 h source impedance; v in =0 to 14v , i o = i omax ; see test configurations i 2 t inrush current transient - - 1 a 2 s input ripple rejection (120hz) - 65 - db turn-on threshold - - 2.95 v turn-off threshold - - 2.8 v hysteresis - 0.2 - 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 applications, ranging from simple standalone operation to an integrated part of sophisticated po wer architecture. to pres erve maximum flexibility, internal fusing is not included; however, to achieve maximum safety and sy stem protection, always use an input line fuse. the safety agencies require a fast-acting fuse with a maximu m rating of 4a. based on the information provided in this data sheet on inrush energy and maximum dc input curr ent, 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. output specifications parameter min typ max unit notes output voltage set point -1 .5 - +1.5 %vo,set with 0.5% tolerance for external resistor used to set output voltage output voltage -2.5 - +2.5 %vo,set over all operating input voltage, resistive load, and temperature conditions until end of life adjustment range 1 0.6 - 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) - - 0.4 %vo,set ripple and noise (pk-pk) - 50 100 mv ripple and noise (rms) - 20 38 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 - 2 a in either sink or source mode output dc current limit - 180 %io,max hiccup mode output short-circuit current - 140 ma vo 250mv, hiccup mode output capacitance 2 esr 1 m ? esr 0.15 m ? esr 10 m ? 22 0 0 - - - 47 1000 3000 uf uf uf without the tunable loop tm with the tunable loop tm with the tunable loop tm - 5 - 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 - 5.2 - 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 - 1.4 - ms time for vo to rise fr om 10% of vo, set to 90% of vo, set output voltage overshoot - - 3.0 %vo,set vin=vin, min to vin, ma x, io=io, min to io, max, with or without maximum external capacitance 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. general specifications parameter min typ max unit notes efficiency vo=0.6v vo=1.2v vo=1.8v vo=2.5v vo=3.3v vo=5.0v - - - - - - 68.7 80.7 85.9 89 91.1 93.6 - - - - - - % % % % % % vin= 12vdc, ta=25c io=io, max , vo= vo,set switching frequency - 600 - khz over temperature protection 140 - - c pgood (power good) overvoltage threshold for pgood undervoltage threshold for pgood pulldown resistance of pgood pin - - - 112.5 87.5 30 - - 70 %vo,set %vo,set ? signal interface open drain, vsupply 5vdc weight - 0.9 - g mtbf 26,121,938 hours calculated per bell core sr-332 (io=0.8io, max, ta=40c, telecordia issue 2 method 1 case 3) dimensions inches (l w h) millimeters (l w h) 0.48 x 0.48 x 0.246 12.19 x 12.19 x 6.25 - 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 5 non-isolated dc/dc converters 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. efficiency data 55 60 65 70 75 80 85 0 0.4 0.8 1.2 1.6 2 vin=14v vin=12v vin=3v 65 70 75 80 85 90 95 0 0.4 0.8 1.2 1.6 2 vin=14v vin=3v vin=12v efficiency, vo=0.6v vo=1.2v 70 75 80 85 90 95 0 0.4 0.8 1.2 1.6 2 vin=14v vin=12v vin=3v 70 75 80 85 90 95 100 0 0.4 0.8 1.2 1.6 2 vin=14v vin=12v vin=3.3v efficiency, (%) ) output current, i o (a) efficiency, vo=1.8v vo=2.5v 70 75 80 85 90 95 100 0 0.4 0.8 1.2 1.6 2 vin=14v vin=12v vin=4.5v 70 75 80 85 90 95 100 0 0.4 0.8 1.2 1.6 2 vin=14v vin=12v vin=6.5v 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. thermal derating curves 0 0.5 1 1.5 2 2.5 45 55 65 75 85 nc 0 0.5 1 1.5 2 2.5 45 55 65 75 85 output current, io ( a ) ambient temperature, t a o c output current, io ( a ) ambient temperature, t a o c vo=0.6v vo=1.2v 0 0.5 1 1.5 2 2.5 45 55 65 75 85 0 0.5 1 1.5 2 2.5 45 55 65 75 85 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 0 0.5 1 1.5 2 2.5 45 55 65 75 85 0 0.5 1 1.5 2 2.5 45 55 65 75 85 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary 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) vin=12v, vo=0.6v, io = io,max vin=12v, vo=1.2v, io = io,max output voltage v o (v) (10mv/div) time, t (1 s/div) output voltage v o ( v ) ( 10mv/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 ) ( 10mv/div ) time, t (1 s/div) output voltage v o (v) (10mv/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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. . transient response waveforms output current, output voltage i o ( a ) ( 1a/div ) v o ( v ) ( 100mv/div ) time, t (20 s /div) output current, output voltage i o ( a ) ( 1a/div ) v o ( v ) ( 100mv/div ) time, t (20 s /div) transient response to dynamic load change from 0% to 50% to 0%. vo=0.6v transient response to dynamic load change from 0% to 50% to 0%. vo=1.2v output current, output voltage i o (a) (1a/div) v o (v) (100mv/div) time, t (20 s /div) output current, output voltage i o ( a ) ( 1a/div ) v o ( v ) ( 100mv/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 ) ( 1a/div ) v o ( v ) ( 100mv/div ) time, t (20 s /div) output current, output voltage i o (a) (1a/div) v o (v) (100mv/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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. startup time output voltage on/off voltage v o ( v ) ( 200 m v/div ) v on/off ( v ) ( 5v/div ) time, t (1 ms/div) output voltage on/off voltage v o ( v ) ( 500 m v/div ) v on/off ( v ) ( 5v/div ) time, t (2 ms/div) start-up using on/off voltage (i o = i o,max , v in= 12v, cext= 22uf), vo=0.6v start-up using on/off voltage (i o = i o,max , v in= 12v, cext= 22uf), vo=1.2v output voltage on/off voltage v o (v) 500mv/div) v on/off (v) (5v/div) time, t (2 ms/div) output voltage on/off voltage v o ( v ) ( 1v/div ) v on/off ( v ) ( 5v/div ) time, t (2 ms/div) start-up using on/off voltage (i o = i o,max , v in= 12v, cext= 22uf), vo=1.8v start-up using on/off voltage (i o = i o,max , v in= 12v, cext= 22uf), vo=2.5v output voltage on/off voltage v o ( v ) ( 1v/div ) v on/off ( v ) ( 5v/div ) time, t (2 ms/div) output voltage on/off voltage v o (v) (2v/div) v on/off (v) (5v/div) time, t (2 ms/div) start-up using on/off voltage (i o = i o,max , v in= 12v, cext= 22uf), vo=3.3v start-up using on/off voltage (i o = i o,max , v in= 12v, cext= 22uf), 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. startup time (continued) output voltage intput voltage v o ( v ) ( 200 m v/div ) v in ( v ) 5v/div ) time, t (1 ms/div) output voltage intput voltage v o ( 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=0.6v start-up using input voltage (v in = 12v, cext= 22uf, i o = i o,max ), vo=1.2v output voltage intput voltage v o (v) (500mv/div) v in (v) 5v/div) time, t (2 ms/div) output voltage intput voltage v o ( v ) ( 1v/div ) v in ( v ) 5v/div ) time, t (2 ms/div) start-up using input voltage (v in = 12v, cext= 22uf, i o = i o,max ), vo=1.8v start-up using input voltage (v in = 12v, cext= 22uf, i o = i o,max ), vo=2.5v output voltage intput voltage v o ( v ) 1v/div ) v in ( v ) 5v/div ) time, t (2 ms/div) output voltage intput voltage v o (v) (2v/div) v in (v) 5v/div) time, t (2 ms/div) start-up using input voltage (v in = 12v, cext= 22uf, i o = i o,max ), vo=3.3v start-up using input voltage (v in = 12v, cext= 22uf, 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary 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 using 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. input filtering the slin-02e2ax module should be connected to a low ac -impedance source. a highly inductive source can affect the stability of the module. input capacitance mu st 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, ceramic capacitors are recommended at the input of the module. the figure below shows the input ripple voltage for various output voltages at 2a of load current with 1x10 f or 1x22 f ceramic capacitors and an input of 5v. input ripple voltage (mvp-p) 20 30 40 50 60 70 80 90 0.5 1 1.5 2 2.5 3 3.5 1x10uf 1x22uf output voltage (vdc) the figure below shows the input ripple voltage for various ou tput voltages at 2a of load current with 1x10 f or 1x22 f ceramic capacitors and an input of 12v. input ripple voltage (mvp-p) 20 30 40 50 60 70 80 90 100 110 0.511.522.533.544.55 1x10uf 1x22uf output voltage (vdc)
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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. output filtering the slin-02e2ax modules are designed for low output ripple voltage and will meet the maximum output ripple specification with 0.1 f ceramic and 22 f ceramic capaci tors at the output of the module. however, additional output filtering may be required by the system designer fo r a number of reasons. first, there may be a need to further reduce the output ripple and noise of the modul e. 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. a minimu m 22uf external cap must be used . the figure below provides output ripple information for different external capacitance values at various vo and for a load current of 2a. for stable operation of the module, limit the capacitance to less t han the maximum output capacitance as specified in the electrical specification table. optimal performanc e of the module can be achieved by using the tunable loop tm feature described later in this data sheet. 0 2 4 6 8 10 12 14 0.5 1.5 2.5 3.5 4.5 output voltage(volts) ripple(mvp-p) 1x22uf external cap 1x47uf external cap 2x47uf external cap note: output ripple voltage for various output voltage s with external 1x22 f, 1x47 f, 2x47 f ceramic capacitors at the output (2a 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, and din en 60950-1 (vde 0850 teil 1):2006-11. for the converter output to be considered meeting the requirements of safety extra-low voltage (selv), the input must meet selv requirements. the power modul e has extra-low voltage (e lv) outputs when all inputs are elv. the input to these units is to be provided with a fast-act ing fuse with a maximum rating of 4a 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. remote on/off parameter min typ max unit notes signal low (unit on) -0.2 - 0.3 v signal high (unit off) active low 3 - vin,max v the remote on/off pin open, unit on. the slin-02e2ax modules feature an on/off pin for remo te on/off operation. two on/off logic options are available. in the positive logic on/off option, the m odule turns on during a logic high on the on/off pin and turns off during a logic low. with the negative logic 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 configur ation for using the on/off pin is shown below. circuit configuration for using positive on/off logic for negative logic on/off modules, the circuit configuration is shown below. circuit configuration for using negative on/off logic q1 vin+ gn d + pwm enable on/off v on/off _ modu le i rpullup on/off 10k q2 10k 50 k 50k q3 10k 10k q1 on / of f vi n + gnd + pwm enable v on /o ff _ module i rpullup on/off 10k q2 10k
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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. over current protection to provide protection in a fault (output overload) condi tion, the unit is equipped with internal current-limiting circuitry and can endure current limiting continuously. at the point of curre nt-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 140c is exceeded at the thermal reference point t ref . the thermal shutdown is not intended as a guarantee t hat the unit will survive temperatures 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 undervoltage lockout lim it, the module operation 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-02e2ax module can be prog rammed to any voltage from 0.6vdc to 5.5vdc by connecting a resistor between the trim and gnd pins of the module. certain restrictions apply on the output voltage set point depending on the input voltage. these ar e shown in the output voltage vs. input voltage set point area plot below. the lower limit curve shows t hat for output voltages of 2.4v and higher, the input voltage needs to be larger than the minimum of 3v. 0 2 4 6 8 10 12 14 16 0.511.522.533.544.555.56 output voltage (v) input voltage (v) 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. output trim equations without an external resistor between trim and gnd pins, the output of the module will be 0.6vdc. to calculate the value of the trim resistor, rtrim, for a desired output voltage, use the following equation: () ? ? ? ? ? ? ? = k vo rtrim 6 . 0 0 . 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 ? ) 1.0 15 1.2 10 1.5 6.67 1.8 5 2.5 3.16 3.3 2.22 5.0 1.36 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-02e2ax modules have a remote sense feature to minimize the effects of distribution losses by regulating the voltage at the 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 . 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. voltage margining output voltage margining can be implemented in the slin-02e2ax 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-02e2ax 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-02e2ax modules can start into a prebiased output as long as the prebias voltage is 0.5v less than the set output voltage. power good the slin-02e2ax modules provide a power good (pgood) signal that is implemented with an open-drain output to indicate that the output voltage is within the 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 out put voltage going 12.5% outside the se t-point value. the pgood terminal should be connected through a pull-up resistor (suggested value 100k ) to a source of 5vdc or lower.
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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. tunable loop tm the slin-02e2ax 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 t he 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 affects 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 combinations 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 470uf 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, 4, and 5 list 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 1a to 2a step change (50% of full load), with an input voltage of 12v, 5v, and 3.3v, respectively.
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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. tunable loop tm (continued) table 2 .general recommended values of r tune and c tune for vin=12v/5v/3.3v and various external ceramic capacitor combinations. co 1x47 f 2x47 f 3x47 f 4x47 f 10x47 f r tune 220 150 100 100 100 c tune 3900pf 10nf 18nf 18nf 22nf table 3 .recommended values of r tune and c tune to obtain transient deviation of 2% of vout for a 1a step load with vin=12v. vo 5v 3.3v 2.5v 1.8v 1.2v 0.6v co 1x22 f 1x47 f 2x47 f 2x47 f 3x47 f 330 f polymer r tune 220 220 150 150 100 100 c tune 2200pf 3900pf 10nf 10nf 18nf 68nf v 81mv 61mv 35mv 34mv 23mv 12mv table 4 .recommended values of r tune and c tune to obtain transient deviation of 2% of vout for a 1a step load with vin=5v. vo 3.3v 2.5v 1.8v 1.2v 0.6v co 1x47 f 2x47 f 2x47 f 3x47 f 330 f polymer r tune 220 150 150 100 100 c tune 3900pf 10nf 10nf 18nf 68nf v 62mv 35mv 34mv 23mv 12mv table 5 .recommended values of r tune and c tune to obtain transient deviation of 2% of vout for a 1a step load with vin=3.3v. vo 2.5v 1.8v 1.2v 0.6v co 3x47 f 2x47 f 3x47 f 330 f polymer r tune 100 150 100 100 c tune 18nf 10nf 18nf 68nf v 48mv 34mv 23mv 12mv
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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. thermal considerations power modules operate in a variety of thermal environm ents; 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 t he operating temperature of the module will re sult in an increase in reliability. the thermal data presented here is based on physical measurements taken in a wind tunnel. 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 the thermal reference point, t ref , used in the specifications is also shown below. for reliable operation the temperature at this point should not exceed 140 o c. the output power of the module should not exceed the rated power of the module (vo,set x io,max). preferred airflow direction and loca tion of hot-spot of the module (t ref ).
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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. example application circuit requirements: vin: 12v vout: 1.8v iout: 1a max., worst case load transient is from 1a to 1.5a vout: 1.5% of vout (27mv) for worst case load transient vin, ripple 1.5% of vin (180mv, p-p) module vout sense gnd trim rtune ctune rtrim vin co1 + ci2 ci1 vin+ vout+ on/off q3 ci1 1x10 f/16v ceramic capacitor (e.g. tdk c series) ci2 100 f/16v bulk electrolytic co1 2x47 f/6.3v ceramic capacitor (e.g. tdk c series, murata grm32er60j476me20) ctune 5600pf ceramic capacitor (can be 1206, 0805 or 0603 size) rtune 150 ? smt resistor (can be 1206, 0805 or 0603 size) rtrim 5k 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. mechanical outline pin function 1 on/off 2 vin 3 gnd 4 vout 5 sense 6 trim 7 gnd 8 nc 9 nc 10 pgood p in 7 pin 8
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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary 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.
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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. packaging details the slin-02e2ax 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 3 vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subsidiary of bel fuse, inc. surface mount information pick and place the slin-02e2ax 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. bottom side / first side assembly this module is not recommended for assembly on the botto m side of a customer board. if such an assembly is attempted, components may fall off the module during t he 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-02e2ax 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 re flow profile based on the volume and thickness of the package. the suggested pb-free solder paste is sn/a g/cu (sac). a 6 mil thick stencil is recommended. for questions regarding land grid array (lga) soldering, solder volume; please contact bel power for special manufacturing process instructions. the recommended linear reflow profile using sn/ag/cu sold er is shown in the figure on the next page. soldering outside of the recommended profile requires te sting to verify results and performance. msl rating the slin-02e2ax modules have a msl rating of 1. storage and handling the recommended storage environment and handling proc edures for moisture-sensitive surface mount packages is detailed in j-std-033 rev. a (handling, pa cking, shipping and use of moisture/reflow sensitive surface mount devices). moisture barrier bags (mbb) with desiccant are required for msl ratings of 2 or greater. these sealed packages should not be broken until ti me of use. once 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 minimum of 12 months from the bag seal date, when stored at the following conditi ons: < 40 c, < 90% relative humidity.
? 2011 bel fuse inc. specifications subject to change without notice.1/14/2011 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 3vdc - 14 vdc input, 0.6 vdc - 5.5 vdc /2 a outputs january 14, 2011 bel power, inc. , a subs idiary of bel fuse, inc. surface mount information (continued) 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. 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 2010-11-19 a first release. t. bubriski 2011-1-14 b updated table 3; added tables 4 and 5. 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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