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Reference Information
2-1-1(c) INTERNAL BLOCK DIAGRAM
1. Internal block diagram of SMPS circuit
Smoothing
circuit
Rectified circuit
Line filter
Power IN
(85-265V)
2. PIC1(KA7552) internal block diagram
BIAS
OFF
2.8V
4.3k
PB
2
2-4
Noise
removal
(SNUBBER)
Convertor
F
E
T
PWM control circuit
(KA7552)
+
Ð
+
Ð
7.0V
ZD
+
Ð
3.6V
G
D MAX
(46%, 70%)
0.24V
3
IS(+)
FLT driving
circuit
5V rectified
smoothing circuit
3.3V rectified
smoothing circuit
9V rectified
smoothing circuit
8V rectified
smoothing circuit
Voltage
detection
circuit
-8V rectified
smoothing circuit
Fig. 2-14
CS
CT
RT
8
7
1
10UA
OSC
PWM
R
OCP
Q
+
S
Ð
Fig. 2-15
Noise remov-
ing circuit at
power
input/output
5V rectified
voltage
circuit(x2)
3.3V rectified
voltage
circuit
9V rectified
voltage
circuit
8V rectified
voltage
circuit
-8V rectified
voltage
circuit
UVLD
4
GND
Samsung Electronics
O
u
t
p
u
t
6
VCC
5
OUT
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