Service manual

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