1 standard ics 5-channel high current driver BA612 the BA612 is a high-current driver ic, and contains an array of five darlington transistors, each with input resistance. input and output can be directed in the same direction using dip pin 14, with the layout optimized to facilitate mount- ing. applications hammer solenoid drivers relay drivers led drivers features 1) 5-circuit darlington transistor array. 2) large current (up to 400ma) can be driven. 3) input and output pins are aligned in the same direc- tion, for easy mounting. 4) high current transfer ratio. 5) can be coupled with mos ics. block diagram 1 n.c. 2 in1 3 in2 4 in3 5 in4 6 in5 7 14 13 12 11 10 9 8 gnd n.c. out1 out2 out3 out4 out5 sub n.c.
2 standard ics BA612 absolute maximum ratings (ta = 25?) parameter symbol limits unit power supply voltage v cc 24 v power dissipation 550 * mw operating temperature topr ?25 ~ + 75 c storage temperature tstg ?55 ~ + 125 c collector current i c 450 ma input pin voltage withstanding ( + ) v in + 24 v input pin voltage withstanding ( ?) v in ?0.5 v pd * reduced by 5.5mw for each increase in ta of 1 c over 25 c internal circuit configuration r 3 r 2 r 1 2 13 r 3 r 2 r 1 = 25k w r 2 = 25k w r 3 = 2k w r 1 3 12 q 4 q 3 r 3 r 2 r 1 4 11 q 6 q 5 r 3 r 2 r 1 5 10 q 8 q 7 r 3 r 2 r 1 6 9 7 q 10 q 9 q 2 q 1 fig.1 electrical characteristics (unless otherwise noted, ta = 25?) parameter symbol min. typ. max. unit conditions measurement circuit usage voltage range v cc 20 v output leakage current i l 100 m av cc = 26v, v in = 0v fig.10 output current (1 circuit) i out 400 ma when only 1 circuit is on fig.11 output current (5 circuits) i out fig.3 dc per circuit when all 5 circuits are on at once collector saturation voltage 2.0 v i out = 400ma, v in = 17v fig.11 dc current transfer ratio h fe 2000 input current i in 0.6 1.0 ma v in = 17v, i out = 0ma fig.11 v ce (sat)
3 standard ics BA612 electrical characteristic curves power dissipation: pd (mw) ambient temperature: ta ( c) 200 0 400 600 550 800 1000 0 ?25 40 80 120 160 125 75 fig.2 power dissipation vs. ambient temperature output saturation voltage: v o (sat) (v) output current: i out (ma) 0.8 0 1.6 2.4 3.2 4.0 0 200 400 v in = 17v fig.4 output saturation voltage vs. output current maximum output current: i out (ma) duty cycle: (%) 100 0 200 300 400 500 20 0 406080100 all 5 circuits on at once repetition: 1hz min. ta = 25 c ta = 50 c fig.3 output current vs. duty cycle output voltage: v out (v) input voltage: v in (v) 4 0 12 20 28 36 2 0 46810 + 100 0 fig.5 output voltage vs. input voltage (temperature characteristic) + 50 + 25 ?25 ?50 c + 75 gain current: h fe ambient temperature: ta ( c) 10 3 10 4 10 5 3 40 20 0 20406080 v o = 1.5v i o = 400ma i o = 200ma fig.7 dc current amplification ratio vs. ambient temperature ( ! ) (when v o = 1.5v) input threshold voltage: vth (v) ambient temperature: ta ( c) 2 0 4 6 8 10 040 ?40 120 80 when i o = 20ma fig.6 input threshold voltage vs. ambient temperature ambient temperature: ta ( c) 10 3 10 4 10 5 3 ?40 ?20 0 20 40 60 80 100 v o = 2.0v i o = 400ma i o = 200ma fig.8 dc current amplification ratio vs. ambient temperature ( @ ) (when v o = 2v) dc foward current transfer rat10: h fe output saturation voltage: v o (sat) (v) ambient temperature: ta ( c) 0.4 0 0.8 1.2 1.6 2.0 040 ?40 120 80 i o = 400ma i o = 200ma v in 17v i o v o ( sat ) fig.9 output saturation voltage vs. ambient temperature
4 standard ics BA612 out BA612 v cc in i l 7 26v fig.10 measurement circuit application example BA612 circuit v cc pmos gate fig.12 1 5 out i out v out (sat) in i in 17v v in 7 BA612 fig.11 dip14 6.5 0.3 19.4 0.3 0.5 0.1 3.2 0.2 4.25 0.3 14 8 7 1 0.3 0.1 0.51min. 7.62 0 ~ 15 2.54 external dimensions (units: mm) connections should be made as shown in figure 12 if inductive load is being driven. a clamp diode has to be added in series with the load to suppress surges in the inductive load.
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