Samsung DVD-909 Service Manual page 62

6-1-3 Internal Block Diagram
6-1-3 (a) Internal Block Diagram of S.M.P.S. Circuit
Smoothing
Circuit
Rectified Circuit
Line Filter
Power IN
(85~265V)
6-1-3 (b) PIC1 (STR-G6153T) Internal Block Diagram
6.3V
2uA
4
Feedback
5v
Reset
Samsung Electronics
Noise
Converter
Removal
(SNUBBER)
PWM Control
Circuit
(1L0380)
Voltage
Detection
Circuit
+
_
Sync.
1mA
OSC.
2.5R
R
Voffset
Rsense
+
_
7.5V
Thermal
Protection
OVP
FLT Driving
Circuit
3.3V Rectified
Smoothing Circuit
5V Rectified
Smoothing Circuit
8V Rectified
Smoothing Circuit
-8V Rectified
Smoothing Circuit
Fig. 6-9
V c c
5
32V
UVLO
Vck
S
Q
R
LEB
Reset
S
R
2
O C P
Fig. 6-10
3.3V Rectified
VoltageCircuit
5V Rectified
VoltageCircuit (x2)
Motor 8V
1 Port
8V Rectified
VoltageCircuit
-8V Rectified
VoltageCircuit
Voltage
Ref.
Sense
Sense
FET
Q
Control IC
Circuit Descriptions
O
U
T
P
U
T
1
Drain
Source
3
GND
6-5