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J1
Line
1
D1
+ 1
2
−
S250
C1 +
J2
Neutral
1
2.2 mF/
400 V
C3
10 nF
C4
56 pF
11 k R2
R1
2.7
The following oscilloscope snapshots illustrate the
operation of the working adapter. The Channel 3 in
Figure 22 shows CT pin voltage at full output load. The
Channel 1 is a gate driver output.
Figure 22. CT Voltage at Full Load Condition
L1
2.2 mH
C2
+
R3
C5
2M7
2.2 mF/
100 nF
400 V
R4
2M7
IC1
1
8
X
FB
NC1
2
7
CT
NC2
X
3
6
CS
V
CC
100 nF
4
5
GND
Gate
NCP1215
Figure 21. Adaptor Application Schematic
http://onsemi.com
NCP1215
C8
T1
4
D5
3
R7
1
LL4448
47 k
R6
47 k
1 nF/
500 V
R5
220
C7
D8
2
C6
MURA160T3
Q1
MTD1N60
ISO1
PC817
The CT voltage at no load condition is depicted in
Figure 23.
Figure 23. CT Voltage at No Load Condition
12
1 nF/Y
L2
D9 MBRS360T3
8
4.7 mH
+
C9
470 mF/
R8
5
16 V
220
10 mF/
16 V +
R9
1 k
BZX84C5V6
D7
J3
+6.5 V@
1
800 mA
C10
J4
1 GND
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