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features ? load current feedback ? programmable over current shutdown ? active clamp ? e.s.d protection ? input referenced to vcc ? over temperatue shutdown ? reverse battery protection ir3312(s) data sheet no.pd60211_c description the ir 3312(s) is a fully protected 4 terminal high side switch. the input signal is referenced to vcc. when the input voltage vcc - vin is higher than the specified vih threshold, the output power mosfet is turned-on. when vcc - vin is lower than the specified vil threshold, the output mosfet is turned-off. a sense current proportional to the current in the power mosfet is sourced to the ifb pin. over-current shutdown occurs when vifb - vin > 4.5 v. the current shutdown threshold is adjusted by selecting the proper rifb. either over-current and over-tem- perature latches off the switch. the device is reset by pulling the input pin high. other integrated protections ( esd, reverse battery, active clamp ) make the ir3312(s) very rugged and suitable for the automotive environment. typical connection programmable current sensing high side switch product summary r ds(on) 20m ? v cc.op. 6 to 28v current ratio 2800 i shutdown 3 to 30a active clamp 35v load dump 40v package www.irf.com 1 vcc out in ir 3312 load battery power ground system ground off on ifb 10 k rifb 5 lead to220 ir3312 5 lead d 2 pak (smd220) IR3312S
ir3312(s) 2 www.irf.com absolute maximum ratings absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. all voltage parameters are referenced to vcc lead. (t ambient = 25 o c unless otherwise specified). 1) limited by junction temperature. pulsed current is also limited by wiring 2) <500 ohm or shorting ifb to gnd may damage the part with isd around 37a 3) >5000 ohm or leaving ifb open will shutdown the part. no current will flow in the load. symbol parameter min. max. units v cc - v in max maximum input voltage -16 50 v cc- v ifb max maximum ifb voltage -0.3 50 vcc - vout max. maximum output voltage -0.3 30 ids cont. diode max. permanent current (rth = 60 c/w) (1) ? 2.8 ids1 cont diode max. permanent current (rth = 5 c/w) (1) ? 25 ids pulsed diode max. pulsed current (1) ? 100 esd 1 electrostatic discharge ( human body model )c=100pf, r=1500 ?, ? 4 esd 2 electrostatic discharge (machine model)c=200pf,r=0 ?, l=10 h ? 0.5 pd power dissipation ( rth = 60 c/w ) ? 2 w tj max. max. storage and junction temperature -40 150 c min rifb minimum resistor on the ifb pin 0.3 ? k ? ifb max max. ifb current -20 +20 ma v a kv recommended operating conditions these values are given for a quick design. for operation outside these conditions, please consult the application notes. symbol parameter min. max. units v cc - v in continuous input voltage 6 28 v cc - v ifb continuous ifb pin voltage 0.3 28 vcc supply to power ground voltage 6 28 iout continuous output current ( rth/amb < 5 c/w, tj = 125c) ? 14 iout 85c amb. continuous output current ( rth/amb < 60 c/w, tj = 125c) ? 3.9 rifb ifb resistor to program isd and scale (2 & 3) 0.5 3.5 k ? pulse min. minimum turn-on pulse width 1 ? ms fmax maximum operating frequency ? 500 fmax prot. maximum frequency with protections activated ? 200 v a hz thermal characteristics symbol parameter typ. max. units r th 1 thermal resistance junction to ambient - to220 60 ? r th 2 thermal resistance junction to case - to220 0.7 ? r th 1 thermal resistance with standard footprint - smd220 60 ? r th 2 thermal resistance with 1" square footprint - smd220 35 ? r th 3 thermal resistance junction to case - smd220 0.7 ? c/w
ir3312(s) www.irf.com 3 symbol parameter min. typ. max. units t est conditions td on turn-on delay time to vcc-vout= 0.9 vcc 2 9 20 t r1 rise time to vcc-vout=5v 0.2 1 5 t r2 rise time to v cc -v out = 0.1v cc 5 15 60 e on turn on energy ? 0.75 1.5 mj td off turn-off delay to v cc -v out = 0.1v cc 5 14 60 t f fall time to vcc-vout = 0.9 v cc 2 7 25 e off turn off energy ? 0.5 1 mj see figure 2 s see figure 3 s switching electrical characteristics v cc = 14v, resistive load = 0.4 ? , t j = 25 o c, (unless otherwise specified). 4) input thresholds are measured directly between the input pin and the tab. any parasitic resistance in common between the l oad current path and the input signal path can significantly affect the thresholds. 5) rds(on) is measured between the tab and the out pin, 5mm away from the package. protection characteristics tj = 25 o c (unless otherwise specified), rifb = 500 to 5kohm. symbol parameter min. typ. max. units test conditions vifb -vin @ isd over-current shutdown threshold 4 4.5 5.4 v tsd over-temp. shutdown threshold ? 165 ? c see fig. 7 treset protection reset time ? 50 300 s see fig. 7 ov over voltage shutdown (not latched) ?36? v isdf fixed over current shutdown 30 37 45 a vifb 35v
ir3312(s) 4 www.irf.com functional block diagram symbol parameter min. t yp. max. units t est condition s ratio i load / iifb current ratio 2,400 2,800 3,300 ? t j = 25 o c ,rfb = 500 ? , i = 30a ratio_tc iload/ifb variation over temperature -5 0 +5 % t j = -40 t 0 +150 o c offset load current diagnostic offset -0.45 0 0.45 a i = 2a trst ifb resp onse time (low signal) ? 5 15 s 90% of the i load step current sense characteristics 4ma 70v active clamp disconnection - + charge pump fast turn-off driver - + 4v reverse battery protection tj > 165 c i out > 30 a in ifb out vcc on/off set reset latch - + q timer 1.5 ms timer 300 us wait 33v min. pulse 80 ? 70v 33v 33v 43v 36v
ir3312(s) www.irf.com 5 vcc 10 % td on tr1 vcc-vout vcc-vin 90% tr2 dv/dt(on) 5v figure 1 - voltages and currents definitions figure 2 - switching time definitions (turn-on) ir3312 vcc-vin vcc-vin max vcc-vin1 max vcc-vin (op) vih vil vhys iin iin max iin1,2 iin(on) vcc-vout vcc-vout max vclamp1 vclamp2 iout iout max -ids cont. -ids pulsed iout 85c isd iq vcc in out ifb vifb ifb lead assignments part number 1 2 3 4 5 5 lead - to220 ir3312 3 (vcc) 5 lead - d 2 pak (smd220) IR3312S 3 (vcc) 1 2 3 4 5 1 - in 2 - ifb 3 - vcc (tab) 4 - nc 5 - out
ir3312(s) 6 www.irf.com 90% 10 % td of f tf vcc-vout vcc-vin dv/dt ( off ) figure 3 - switching time definitions (turn-off) figure 4 - active clamp waveforms figure 5 - current sense precision: accurate measurement only when the power mosfet is fully on ids vout vin t clamp vds clamp ( see design tip to evaluate power dissipation ) vcc vcc vcc-vclamp iout 12v 0 v vcc-vin t minpulse t minpulse 0 v wait figure 6 - minimum pulse & wait function i load ifb vin clamp 24 us (typ.) precise measurement
ir3312(s) www.irf.com 7 figure 7 - protection timing diagrams figure 9- rds on (m ? ) vs vcc-vin (v) figure 8 - icc (ma) vs vcc-vin (v) tjsd iout isd oi shutdown tj ot shutdown t < t reset t > t reset 12v 0 v vcc-vin wait t < t reset t > t reset wait 0 2 4 6 8 10 0 10203040506070 all curves are typical characteristics. operation in hatched areas is not recommended. tj=25 0 c, rifb=500 ohm, vcc=14v (unless otherwise specified). 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30
ir3312(s) 8 www.irf.com figure 10 -normalized rdson (%) vs tj ( o c) figure 11 - vih, vil & vifb -vin (v) vs tj ( o c) figure 12 - error (+/-a) vs iload (a) figure 13 - isd (a) vs rifb (ohm) 0% 20% 40% 60% 80% 100% 120% 140% 160% 180% 200% -50-250 255075100125150 0 1 2 3 4 5 6 -50 -25 0 25 50 75 100 125 150 vifb-vin vih vil 0 1 2 0 15 30 typical value max. specified 3 4 1 10 100 100 1000 10000 isd min 3s isd typ isd max 3s
ir3312(s) www.irf.com 9 figure 16 - i out (a) vs protection resp. time (s) figure 17 - rth ( o c/w) vs time (s) figure 14 - max. dc current (a) vs t emp. (c) figure 15 - max. i (a) vs inductance (mh) 0 5 10 15 20 25 30 35 -50 0 50 100 150 200 5c/w 15c/w 35c/w 1'' foot 60c/w std f ooprint 1 10 100 0. 001 0. 01 0. 11 10 single pulse 100hz rth=60c/w dt=25c 1khz rth=60c/w dt=25c 1 10 100 1e-05 0. 0001 0. 001 0. 01 0. 1 1 10 100 1000 t=25c free air/ std. footprint t=100c free air/ std. footprint current path capability should be above those curves load characteristic should be above those 0. 1 1 10 100 0. 0001 0. 001 0. 01 0. 1 1 10 100 1000 60c/w free air 5c/w
ir3312(s) 10 www.irf.com case outline - to220 (5 lead) irgb 01-3042 01
ir3312(s) www.irf.com 11 case outline 5 lead - d 2 pak (smd220)
ir3312(s) 12 www.irf.com ir world headquarters: 233 kansas st., el segundo, california 90245 tel: (310) 252-7105 data and specifications subject to change without notice. this product has been designed and qualified for the automotive [q100] market. 10/20/2003 tape & reel 5 lead - d 2 pak (smd220) 01-3071 00 / 01-3072 00

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