BenQ T201WA, Service Manual, Page: 47 / 59

#5 PWM Controller
The PWM controller NCP1200A implements a standard current mode architecture.
With an internal structure operating at a fixed 60KHz.Where the switch time is
dictated by the peak current setting-point. When the current setting-point falls below a
given value. The output power demand diminish, the IC automatically enters the so-
called skip cycle mode and provides excellent efficiency.
R613
1K
R614
18K
C607
1000P K
L604
45 OHM
L605
45 OHM
L608
45 OHM
R611
220
C609
1000P J
R615
0.22
R610
18K
+
C606
47U 50V
1
2
+
C611
47U 50V
1
2
ZD601
15V
A
K
D605
1N4148
1
2
3
T601
350U
2
1
7
10
4
8
9
5
D602
EGP10D
A K
R612
47
D604
1N4148
1 2
R607
68K J
D603
1N4148
1 2
‧
IC601
NCP1203AP60
HV
8
NC
7
DRV
5
VCC
6
GND
4
CS
3
FB
2
ADJ
1
R623
4.7
R603
18K
R619
18K
D601
UF4007-LF
A
K
P01
P02
P17
+
-
~
~
BD601
GSIB4A60-LF
3
1
2
4
+
C605
<Spec>
120U 450V
1
2
R608
330K
R609
330K
R616
330K
Q601
2SK3530-01MR
D
G
S
L3
N2
E1
E6
E4
E2
E5
C1
E3
C2
C613 0.1U K
R617
1K
Fig. 6
#6 Feedback circuit
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