Service manual

Principles of Operation
Figure 2-18 shows the output from AMP1. When the voltage at pin 4 becomes
higher than that at pin 5 (over-voltage), pulse width modulation modulates the
AMP1 output current and reduces the circuit’s output voltage. R108 and C35
compensate for phase lag in the error amplifier, preventing abnormal oscillation.
(The next section describes pulse width modulation.)
Figure 2-18. AMP1 Output Control (+5 KVC)
LQ-2OO/AP3OOO