Samsung BD-P1000XEU Manual page 130

1) F/B terminal of IC01, IC02 determines output duty cyle.
2) C-E (Collector-Emitter) of IC01, IC02 and F/B potential of IC01, IC02 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
(ICE3B5065P)
Voltage
Detection
Circuit
3.3V Rectified
Smoothing Circuit
5V Rectified
Smoothing Circuit
12V Rectified
Smoothing Circuit
3.3V Rectified
Smoothing Circuit
Fig. 13-4
Circuit Operating Descriptions
O
U
5V Rectified
VoltageCircuit (x3)
U
12V Rectified
VoltageCircuit (X3)
T
P
T
13-3