Toshiba D-VR3SU Service Manual page 103

1) F/B terminal of IC1S01 determines output duty cyle.
2) C-E (Collector-Emitter) of IC1S01 and F/B potential of IC1S01 are same.
7-1-3 Internal Block Diagram (Internal Block Diagram of S.M.P.S. Circuit)
Smoothing
Circuit
Rectified Circuit
Line Filter
Power IN
(120V)
Noise
Converter
Removal
(SNUBBER)
PWM Control
Circuit
(ICE2BSO1)
Voltage
Detection
Circuit
3.3V Rectified
Smoothing Circuit
12V Rectified
Smoothing Circuit
5V Rectified
Smoothing Circuit
15V Rectified
Smoothing Circuit
33V Rectified
Smoothing Circuit
Fig. 7-4
Circuit Operating Descriptions
9V Rectified
VoltageCircuit
O
U
5V Rectified
T
VoltageCircuit (x3)
P
U
12V Rectified
T
VoltageCircuit (X3)
7-3