bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converters 12 vdc input 0.9 vdc - 3.3 vdc/7 a output ? non-isolated ? remote on/off ? fixed frequency ? input under voltage lockout ? high efficiency ? ocp/scp ? high power density ? wide range trim ? low cost ? ul60950-1 recognized (ul/cul) description the bel xrah-07a1a0 modules are a series of non-isolated, step down dc/dc converters that operate from a nominal 12 vdc source. these converters are available in a range of output voltages from 0.9 vdc to 3.3 vdc. it is packaged in a compact, overmolded package rated at 7 a. optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. the output is closely regulated and the efficiency is typically 88% for 3.3 vdc output at full load. typical features include remote on/off, input under voltage lockout, over current protection and short circuit protection. part selection output voltage input voltage max. output current max. output power typical efficiency part number surface mount part number vertical mount 0.9 vdc - 3.3 vdc 12 vdc 7 a 23.1 w 88% SRAH-07A1A0 vrah-07a1a0 notes: 1. add ?0? suffix at the end of the model number to indicate ?tube packaging?, and ?r? for ?reel packaging?, and ?g? for ?tray packaging?. 2. all part numbers above indicate rohs 6. change the second letter "r" to "7" for rohs 5 part numbers. absolute maximum ratings parameter min typ max notes input voltage (continuous) -0.3 v - 15 v output enable terminal voltage -0.3 v - 14 v ambient temperature -40 c - 85 c storage temperature -55 c - 125 c input specifications parameter min typ max notes input voltage 10 v - 14 v input current (no load) - - 100 ma input current (full load) v o =3.3 v v o =2.5 v v o =1.8 v v o =1.5 v v o =1.2 v v o =0.9 v - - - - - - - - - - - - 3.0 a 2.6 a 1.9 a 1.6 a 1.3 a 1.0 a remote off input current - 3 ma 10 ma xrah-07a1a0 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 non-isolated dc/dc converters 12 vdc input 0.9 vdc - 3.3 vdc/7 a output input specifications (continued) parameter min typ max notes input reflected ripple current (pk-pk) - 180 ma - input reflected ripple current (rms) - 50 ma - tested with simulated source impedance of 500 nh, 5 hz to 20 mhz and two 270 uf/16 v oscon capacitors with esr=0.018 ohm max. at 100 khz i 2 t inrush current transient - 0.01 a 2 s0.02 a 2 s turn on voltage threshold - 9.5 v - turn off voltage threshold - 9.0 v 9.5 v output specifications parameter min typ max notes output voltage set point v o =3.3 v v o =2.5 v v o =1.8 v v o =1.5 v v o =1.2 v v o =0.9 v 3.247 v 2.460 v 1.771 v 1.476 v 1.181 v 0.886 v 3.3 v 2.5 v 1.8v 1.5 v 1.2 v 0.9 v 3.353 v 2.540 v 1.829 v 1.524 v 1.219 v 0.914 v test conditions: vin=12 v, io=50% full load line regulation - 3mv 6mv load regulation v o =3.3 v v o =2.5 v v o =1.8 v v o =1.5 v v o =1.2 v v o =0.9 v - - - - - - 5 mv 5 mv 5 mv 3 mv 3 mv 10 mv 10 mv 10 mv 6 mv 6 mv c to +85 c) - 30 mv 50 mv output current 0 a - 7 a current limit threshold 10 a - 20 a short circuit surge transient - 0.02 a 2 s 0.04 a 2 s ripple and noise (rms) v o =3.3 v v o =2.5 v v o =1.8 v v o =1.5 v v o =1.2 v v o =0.9 v - - - - - - 20 mv 20 mv 15 mv 15 mv 15 mv 10 mv 50 mv 50 mv 40 mv 40 mv 30 mv 30 mv ripple and noise (pk-pk) v o =3.3 v v o =2.5 v v o =1.8 v v o =1.5 v v o =1.2 v v o =0.9 v - - - - - - 70 mv 70 mv 60 mv 60 mv 60 mv 50 mv 100 mv 100 mv 100 mv 80 mv 80 mv 70 mv test condition: 0-20 mhz bw, with a 330 uf/10 v tantalum capacitor at the output. turn on time - 8 ms 20 ms overshoot at turn on - 0% 3% output capacitance 330 uf - 2800 uf transient response overshoot - 120 mv 180 mv 50% ~ 100% max load settling time - 50 us 80 us overshoot - 120 mv 180 mv 100% ~ 50% max load settling time all - 50 us 80 us test conditions: di/dt = 0.5 a/us; vin = 12 v; with a 330 uf/10 v tantalum capacitor at the output. note: all specifications are typical at nominal input, full load at 25 c unless otherwise stated.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converters 12 vdc input 0.9 vdc - 3.3 vdc/7 a output general specifications parameter min typ max notes efficiency v o =3.3 v v o =2.5 v v o =1.8 v v o =1.5 v v o =1.2 v v o =0.9 v 85% 83% 80% 78% 75% 71% 88% 86% 83% 81% 78% 74% - - - - - - measured at vin=12 v, full load and ta=25 c switching frequency 250 khz 300 khz 350 khz output trim range (wide trim) - - 403% vo v o =0.9 v output trim range (narrow trim) v o =1.2 v-3.3 v v o =0.9 v 90% vo - - - 110% vo 110% vo mtbf 8,202,646 hours calculated per bell core sr-332 (vin=12 v; vo=3.3 v; i o = 5.6 a; t a = 25 c) dimensions (surface mount) inches (l w h) millimeters (l w h) 0.78 x 0.70 x 0.32 19.81 x 17.78 x 8.13 dimensions (vertical) inches (l w h) millimeters (l w h) 0.70 x 0.308 x 0.65 17.78 x 7.82 x 16.51 weight - 5 g - control specifications parameter min typ max notes remote on/off signal low (unit off) -0.3 v - 1 v signal high (unit on) 3.5 v - 14 v remote on/off pin open, unit on. output trim equations equations for calculating the trim resistor (in k ? ) given the desired adjusted voltage (vadj) and the nominal output voltage of the converter (vnom) are shown below. the trim up resistor should be connected between the trim pin and ground. 05 . 1 06 . 6 ? ? = nom adj trimup v v r note: output voltage vo=0.9 v when r trimup is not connected. module vout trim gnd rtrimup
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converters 12 vdc input 0.9 vdc - 3.3 vdc/7 a output efficiency data efficiency curve 60.0% 65.0% 70.0% 75.0% 80.0% 85.0% 90.0% 95.0% 0.70 1.75 3.50 5.25 7.00 output current (a) efficienc y 10.0 v 12.0 v 14.0 v vo=3.3 v efficiency curve 55.0% 60.0% 65.0% 70.0% 75.0% 80.0% 85.0% 90.0% 0.70 1.75 3.50 5.25 7.00 output current (a) efficienc y 10.0 v 12.0 v 14.0 v vo=1.8 v efficiency curve 45.0% 50.0% 55.0% 60.0% 65.0% 70.0% 75.0% 80.0% 85.0% 0.70 1.75 3.50 5.25 7.00 output current (a) efficienc y 10.0 v 12.0 v 14.0 v vo=0.9 v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converters 12 vdc input 0.9 vdc - 3.3 vdc/7 a output thermal derating curves vo=0.9 v - 2.5 v vo=3.3 v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converters 12 vdc input 0.9 vdc - 3.3 vdc/7 a output ripple and noise waveforms ripple and noise at full load 0.9 vdc output ripple and noise at full load 1.2 vdc output ripple and noise at full load 1.5 vdc output ripple and noise at full load 1.8 vdc output ripple and noise at full load 2.5 vdc output ripple and noise at full load 3.3 vdc output note: ripple and noise at 12 vdc input, with a 330 uf/10 v tantalum cap at the output, ta=25 deg c.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converters 12 vdc input 0.9 vdc - 3.3 vdc/7 a output transient response waveforms transients 50% to 100% load 0.9 vdc output transients 100% to 50% load 0.9 vdc output transients 50% to 100% load 1.2 vdc output transients 100% to 50% load 1.2 vdc output transients 50% to 100% load 1.5 vdc output transients 100% to 50% load 1.5 vdc output
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converters 12 vdc input 0.9 vdc - 3.3 vdc/7 a output transient response waveforms (continued) transients 50% to 100% load 1.8 vdc output transients 100% to 50% load 1.8 vdc output transients 50% to 100% load 2.5 vdc output transients 100% to 50% load 2.5 vdc output transients 50% to 100% load 3.3 vdc output transients 100% to 50% load 3.3 vdc output note: transient response at 12 v input, di/dt=0.5 a/us, with 330 uf/10 v tantalum cap at the output, ta=25 deg c.
? 2007 bel fuse inc. specifications subject to change without notice. 010507 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 12 vdc input 0.9 vdc - 3.3 vdc/7 a output mechanical outline SRAH-07A1A0 vrah-07a1a0 rohs compliance complies with the european dire ctive 2002/95/ec, calling for th e elimination of lead and other hazardous substances from electronic products. these parts are not however compatible with the higher temperatures associated with lead free solder processes and must be soldered using a reflow profile with a peak temperature of no more than 240 oc. bel pin connections pin function 1 remote on/off (option) 2 vin 3 ground 4 vout 5 trim (option) 6 n/a 7 n/a pin connections pin function 1 remote on/off (option) 2 vin 3 ground 4 vout 5 trim (option) bel bel
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