STK681-300 Datasheet, PDF (5/10 Pages) Sanyo Semicon Device – Forward/Reverse Motor Driver

STK681-300
Motor Drive Conditions (H: High-level input; L: Low-Level Input)
IN1
Stop 1 (standby)
H
Stop 2 (supply power turned off by input during
H
motor rotation)
H
IN2
INH
Remarks
H
H or L
When motor is not rotating
H
H
Stop signal that is applied when the motor is
L
H
running and used to turn off power.
Forward (CW)
Reverse (CCW)
L
H
H
H
L
L
No input signal is needed that turns off the
upper- and lower-side drive devices when
L
H
L
switching the rotational direction.
Brake
L
L
* IN1=IN2=H and INH=L are prohibited during motor rotation.
L or H
GND side MOSFET ON
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.
OUT1 or OUT2
Output voltage
VCC1-Vsat1
GND
TR1 or TR2
Collector current
Motor current
50μs
IO peak (current setting value)
0A
IO peak (current setting value)
0A
(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.
No. A0760-5/10