STK681-310

No. A0761-5/10

Motor Drive Conditions (H: High-level input; L: Low-Level Input)

IN1

IN2

INH

Remarks

Stop 1 (standby)

H

H

H or L

When motor is not rotating

H

H

H

H

L

H

Stop 2 (supply power turned off by input during

motor rotation)

L

H

H

Stop signal that is applied when the motor is

running and used to turn off power.

Forward (CW)

H

L

L

Reverse (CCW)

L

H

L

No input signal is needed that turns off the

upper- and lower-side drive devices when

switching the rotational direction.

Brake

L

L

L or H

GND side MOSFET ON

* IN1=IN2=H and INH=L are prohibited during motor rotation.

Notes

(1) Be sure to set the capacitance of the power supply bypass capacitor, C1, so that the ripple current of the capacitor,

which varies as motor current increases, falls within the allowed range.

(2) Although the Vref2 pin is kept open, if connected to the GND or S.P pin, the overheating current control circuit

ceases to function.

(3) Fixed current chopping operations based on TR1 and TR2 are used for current control. The timing given below is

used for OUT1 or OUT2 voltage output and for TR1 or TR2 collector current.

(4) Do not connect the N.C pins shown in the internal block diagram or sample application circuit to a circuit pattern on

the PCB.

(5) This IC is not designed for use in an H-bridge driver for power supplies because the I/O response time of its GND

side driving device, required when switching the motor rotational direction, is several scores of microseconds.

It should be used only for DC motor drivers.

OUT1 or OUT2

Output voltage

TR1 or TR2

Collector current

Motor current

50

μs

0A

GND

VCC1-Vsat1

IO peak (current setting value)

0A

IO peak (current setting value)