BA6402F datasheet(3/3 Pages) ROHM

3 / 3 page

691

Motor driver ICs

BA6402F

(3)

Power dissipation

The power consumed in the IC can be calculated from

the following equation :

(1) PC1 is power consumed by the circuit current.

PC1=VCC

ICC

(2) PC2 is power consumed by the Hall current (pin 3).

PC2=I3

where V3=pin 3 voltage. Connecting a resistor between

the VCC pin and pin 3 effectively reduces the IC current

consumption.

(3) PC3 is power consumed by the output current.

PC3=(VCC

*VOH) IO

VOH is the HIGH level voltage of pins 7 and 8. Power con-

sumption can be reduced by raising the hFE-rank of the

external output transistor and thereby reducing the IO val-

ue. Make sure that your application does not exceed the

allowable power dissipation of the IC.

(4) Restarting when motor is locked

The outputs are turned OFF if the motor is stopped for

some reason. To restart the motor from this situation, turn

off the power first, fully discharge the pin 6 capacitor next,

and then turn on the power again.

FElectrical characteristic curve

FExternal dimensions (Units: mm)

n=1

PC=

ΣPCn

BA6402F データシート(PDF) 3 Page - Rohm