mft preliminary RT8H052C *this is tentative s p ecification. description RT8H052C is composed by npn transistors, pnp transistors and resistors. it can miniaturization of a set and reduce parts or time necessary for completion. this mft composed the circuit for the over current protection of three shunt method. features miniaturization of a set. variable vref by external resistance. open collector output. application the over current protection of three shunt method. block diagram 110427 1/4 the over current protection of three shunt method 2 3 6 5 4 outline drawing unitmm 0 0.1 0.81 2.8 1.50 0.95 2.80 0.65 0.65 1.9 0.33 1.1 1.2 vcc in1 in2 in3 vref gnd pin configuration in1 in2 in3 vref gnd vcc
mft preliminary RT8H052C *this is tentative s p ecification. absolute maximum ratings(ta25) electrical characteristic(ta=25,vcc=5v unless otherwise noted .) min typ max 110427 2/4 the over current protection of three shunt method circuit current of off states vcc-0.8 ma 0.2 0.5 v v 0.5 in1=1vin2=in3=0vvref=0.5v 2.9 0.5 vin1th in1 threshold voltage in2 threshold voltage in3 threshold voltage vin3th vin2th vref=0.5vin2=in3=0v v vref=0.5vin1=in2=0v vref=0.5vin1=in3=0v ma 0.3 - v circuit current of on states common mode input voltage range parameter operating supply voltage range vincm topr icc_on vcc symbol internal power dissipation taR25 icc_off junction temperature thermal derating tj (keep dry) tstg operating temperature symbol tj k pd v cc 5 in1=in2=in3=0vvref=0.5v parameter conditions supply voltage ratings 12 test conditions unit v v 3 unit 10 designed value 150 1.6 -30150 (keep dry) storage temperature mw 200 -40150 mw/
mft preliminary RT8H052C *this is tentative s p ecification. application circuit examples operating explanation selection of parts 110427 3/4 the over current protection of three shunt method m high- side driver low- side driver mcu vcc in1 in2 in3 vref gnd mft dip-ipm r2 r1 r3 r4 v1 q1 r5 r6 r7 r8 r9 r10 c1 c2 c3 this mft have vref terminal ,so the threshold voltage can be fr eely set by external connected resistance. mft doesn't have the output terminal for six pins mft(vcc,gnd,v ref,in1,in2,in3). the terminal vcc uses two functions of the power-supply voltage terminal and the output terminal. the circuit current flows about 200ua, when the threshold volta ge does not get over than neither of in1in3 setting of vref. when the voltage of vref(v) or more is impressed to either of terminal of in1in3, it enters the state of detection , the circuit current flows to vcc becomes about 2.9ma. by using the characteristic of this circuit current, the output signal can be made by connecting the pnp transistor outside. th e output terminal is the collector terminal of the q1:pnp transistor. at the usual state, the pnp transistor is turning off and output low. at the detecting state, the pnp transistor is turning on and ou tput high. how to select the resistance at above application circuit examp le. resistance r1 connected between emitter bases of the q1:pnp tra nsistor is set to turn on the pnp transistor when the pnp transistor is usually turned of f in the circuit current in the state, and the detected circuit current flows about mft. please set resistance r1 at rage 390?1.5k. the current thrown into the q1:pnp transistor is adjusted by re sistance r2 between collectors gnd. calculation formula, if making vref from resistance. vref(v)=r4/(r3+r4)*v1 r5, r6, and r7 are the shunt resistance. r8, r9, r10, c1, c2, a nd c3 are noise filters. please connect it if necessary. the above value is a theory value. please set it after an enoug h evaluation.
mft preliminary RT8H052C *this is tentative s p ecification. thermal derating 110427 4/4 the over current protection of three shunt method ambient temperature ta [] 0 25 50 75 100 125 150 200 150 100 50 0 power dissipation pd[w] 250
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