Toshiba e-STUDIO200L Service Manual page 275

The block diagram of TA8428 and the operation of the control logic are shown below.
Thermal shutdown
over-current
protection circuit
Control logic
1
IN1
Input
IN1 IN2
H H
L H
H L
L L
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2 3 4
IN2 M(+) GND
Fig. 12-4
Output
M (+) M (-)
L L
L H
H L
OFF
(High impedance)
12 - 5
5 6
M(-) N.C. VCC
State
Brake
CCW
CW
Stop
e-STUDIO200L/202L/203L/230/232/233/280/282/283
7
DEVELOPMENT SYSTEM
12