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 12v input / programmable output / 30a vrm ? high efficiency means less power dissipation ? remote on/off ? 2-wire remote sense ? 5 bit voltage programming scheme ? adaptive voltage positioning (load line) description the v7nb-30a07a is a non-isolated step down dc/dc co nverter capable of supplying up to 30a of average output current with output vo ltage selection via a 5-bit vid code. standar d features include remote on/off, over current protection, remote sense and a power good signal. this product also makes use of adaptive positioning to improve transient response performance. this model number can support multiple vid schemes by terminating pin 9 with specific resistor and reference co mbinations. typical applications include file servers, work stations and other computing applications. input specifications parameter min typ max notes input voltage range 10.8 vdc 13.2 vdc input current (disabled) 30ma input current (full load) 8a reflected ripple current 150ma rms with 100uf, 25mohm capacitor and 200nh of input inductance. output specifications parameter min typ max notes output current 0a 30a set point accuracy 1.62v 1.65 1.68v no load, excluding adaptive positioning, vid 01000 (08h), pin 9 terminated to ground through a 4.77k resistor. load line impedance 1.65 mohm 50mv droop from 0 to 30a ripple and noise 25mv pk-pk, 0 to 20mhz bandwidth full load with external 6 x 470uf 7mohm polymer capacitors and 6 x 10uf x5r ceramic capacitors. turn on time 8ms 16ms transient response deviation settling time 50mv 175us di/dt = 2.5a/us load step =50% of max load. external c out as specified for ripple and noise. includes load line remote sense compensation 0.3vdc output capacitance 800uf 5,000uf for applications requiring higher or lower output capacitance please consult factory. note 1: feedback compensation optimized for external 6 x 470uf, 7mohm, polymer capacitors and 6 x 10uf x5r ceramic capacitors. v rnb-30a07a preliminary
? 2004 bel fuse inc. specifications subject to change without notice. 030104 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 12v input / programmable output / 30a vrm general specifications parameter specification switching frequency 1.2 mhz typical (fixed) dimensions inches mm 3.8 x 1.0 x .81 96.5 x 25.4 x 20.6 operating temperature 0 c to 70 c non-operating temperature -40 c to 100 c protection features over current undervoltage 120% to 175% max io uvlo vin < 9.5v remote on/off active high efficiency (full load) 1.25v output 82.5% pin connections row a row b pin function pin function 1 vin+ 62 vin- 2 vin+ 61 vin- 3 vin+ 60 vin- 4 vin+ 59 vin- 5 reserved 58 vrm-pres 6 no pin 57 vid4 7 vid3 56 vid2 8 vid1 55 vid0 9 analog trim 54 nc 10 pwrgd 53 outen 11 vo-sen- 52 vo-sen+ 12 uvlo_set 51 reserved 13 vo- 50 vo+ 14 vo+ 49 vo+ 15 vo- 48 vo- 16 vo+ 47 vo+ 17 vo- 46 vo- 18 vo+ 45 vo+ 19 vo- 44 vo- 20 vo+ 43 vo+ 21 vo- 42 vo- 22 vo+ 41 vo+ 23 vo- 40 vo- 24 vo+ 39 vo+ 25 vo- 38 vo- 26 vo+ 37 vo+ 27 vo- 36 vo- 28 vo+ 35 vo+ 29 vo- 34 vo- 30 vo+ 33 vo+ 31 vo- 32 vo- voltage identification (vid) code vid4 vid3 vid2 vid1 vid0 vo (vdc) 1 1 1 1 1 out p ut off 1 1 1 1 0 1.1 1 1 1 0 1 1.125 1 1 1 0 0 1.15 1 1 0 1 1 1.175 1 1 0 1 0 1.2 1 1 0 0 1 1.225 1 1 0 0 0 1.25 1 0 1 1 1 1.275 1 0 1 1 0 1.3 1 0 1 0 1 1.325 1 0 1 0 0 1.35 1 0 0 1 1 1.375 1 0 0 1 0 1.4 1 0 0 0 1 1.425 1 0 0 0 0 1.45 0 1 1 1 1 1.475 0 1 1 1 0 1.5 0 1 1 0 1 1.525 0 1 1 0 0 1.55 0 1 0 1 1 1.575 0 1 0 1 0 1.6 0 1 0 0 1 1.625 0 1 0 0 0 1.65 0 0 1 1 1 1.675 0 0 1 1 0 1.7 0 0 1 0 1 1.725 0 0 1 0 0 1.75 0 0 0 1 1 1.775 0 0 0 1 0 1.8 0 0 0 0 1 1.825 0 0 0 0 0 1.85 see note 2. note 2: vrm 9 vid codes are achieved by terminating pin 9 to ground with an equivalent resistance of 4.77k. note 3: output voltage vs. vid can be modified by minus 400mv at each vid by applying a reference to pin 9. applied reference should have a thevenin equivalent voltage of 400mv and thevenin equivalent resistance of 4. 77k. application of this offset reference must be synchronized with enabling the vrm. see application circuit 1. note 4: if pin 9 is floating the resulting output voltage will be 50% of the va lues in the vid table at each vid setting.
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 12v input / programmable output / 30a vrm m echanical drawing
? 2004 bel fuse inc. specifications subject to change without notice. 030104 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 12v input / programmable output / 30a vrm 9.76k 9.76k 51.1 51.1 9.76k zi zf vid dac 11 52 vout v error +s -s 4.99k 9 memory vrm set point functional block diagram vid0 vid1 vid2 vid3 vid4 internal circuit 1.
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 12v input / programmable output / 30a vrm 20.5k bss138 20.5k bav99 enable pwm c0ntrol +vin +vin 53 vrm enable interface functional block diagram outen internal circuit 2.
? 2004 bel fuse inc. specifications subject to change without notice. 030104 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 12v input / programmable output / 30a vrm r bias to outen pin 53 r a r b i bias for best accuracy use a local ground pin on the vrm. preferably pin 58, 59, 60, 61, or 62. shunt reference on/off control to memory pin 9 v ref r b = 4,770*v ref v ref - v offset v offset is the fixed offset that will be subtracted from each of the nominal vout vs. vid values shown in the vid table. r a = v ref - v offset v offset *r b connected as above. if vin = 10v and rbias = 10k then typically: if v ref = 1.24v, i bias = 170ua, v outen (on) = 2.95v. if v ref = 2.048v, i bias = 132ua , v outen (on) = 3.36v. recommended circuit to establish a fixed negative offset to the vid values in the vid table reference circuit 1.
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