KA8328D
VCR PRODUCTS
6.OUT (Driver) has the function of driving the motor through amplifying the driving current to a proper level.
Freewheeling diode is designed at the C-E terminal of each TR, and protect the TR by making the motor current
freewheeling when the TR is turned off.
The motor current is kept constant through being detected by the resistance (R3) and returned as feedback again
via the Feedback circuit. Accordingly the motor rotative velocity is also kept constant.
12
Q9
Q10
A phase
13
Q11
14
Q12
R3
AMP &
Feedback
10
MIC-99D001
January 1999