Power - Samsung DVD-R130/XAA Service Manual

1) F/B terminal of PQIZ1 determines output duty cyle.
2) C-E (Collector-Emitter) of PQIZ1 and F/B potential of PQIZ1 are same.
13-1-3 Internal Block Diagram (Internal Block Diagram of S.M.P.S. Circuit)
Smoothing
Circuit
Rectified Circuit
Line Filter
Power IN
(110V)
Samsung Electronics
Noise
Converter
Removal
(SNUBBER)
PWM Control
Circuit
(ICE3B2065P)
Voltage
Detection
Circuit
3.0V Rectified
Smoothing Circuit
12V Rectified
Smoothing Circuit
5.4V Rectified
Smoothing Circuit
3.3V Rectified
Smoothing Circuit
33V Rectified
Smoothing Circuit
Fig. 13-4
Circuit Operating Descriptions
12V Rectified
VoltageCircuit
O
U
5V Rectified
T
VoltageCircuit
P
U
T
13-3