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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.
L5
2
1
TR601
NTC 8
4
R617
470
E1
1
BD601
R603
GSIB4A60-LF
18K
E6
IC601
NCP1203AP60
1
‧
8
ZD601
ADJ
HV
TZM5245B
2
7
FB
NC
3
6
CS
VCC
IC601.5
4
5
GND
DRV
C613
0.1U K
1K
R613
R619
18K
R610
18K
- 43 -
R608
470K
C605
+
150U 450V
<Spec>
C1
UF4007-LF
R609
470K
D603
1N4148
2
R611
220
C611
+
47U 50V
R623
D604
4.7
1N4148
2
1
R612
47
D605
R614
18K
1N4148
C609
1000P J
Fig. 6
L605
E2
45 OHM
R607
C607
68K J
1000P K
1
E4
D601
E5
L604
45 OHM
E3
2
D602
EGP10D
L608
1
K
A
4
45 OHM
C606
+
47U 50V
Q601
2SK3530-01MR
G
5
R625
R626
R627
R628
1
1
1
1
T601
10
9
3
8
6
450U
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