Acer P221W - Page 43

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#5 PWM Controller
The PWM controller NCP1203 implements a standard current mode architecture. With
an internal structure operating at a fixed 60KHz where the switch time is detected by
the peak current set-point. When the current set-point falls below a given value, the
output power demand diminished, the IC automatically enters the so-called skip cycle
mode and provides excellent efficiency.
IC601.5
R613 1K
R614
18K
L604
45 OHM
L605
45 OHM
L608
45 OHM
R610
18K
+
C606
47U 50V
12
+
C611
47U 50V
12
ZD601
TZM5245B
A K
D605
1N4148
1 2
C613
0.1U K
R611
220
D602
EGP10D
AK
t
TR601
NTC 8
2 1
R612
47
R623
4.7
3
T601
450U
1
2
9
10
4
8
6
5
D604
1N4148
12
R607
68K J
D603
1N4148
12
‧
IC601
NCP1203AP60
HV
8
NC
7
DRV
5
VCC
6
GND
4
CS
3
FB
2
ADJ
1
R603
18K
R619
18K
E1
E3
E2
E6
E4
E5
L5
R617
470
D601
UF4007-LF
A K
C1
R608
470K
R609
470K
+
-
~
~
BD601
GSIB4A60-LF
3
1
2
4
R625
1
R626
1
R627
1
R628
1
+
C605
<Spec>
150U 450V
12
Q601
2SK3530-01MR
D
G
S
C609
1000P J
C607
1000P K
Fig. 6