NCP1215 Datasheet, PDF (12/16 Pages) ON Semiconductor – Low Cost Variable OFF Time Switched Mode Power Supply Controller

NCP1215
J1
Line 1
D1
L1
2 − _S250 + 1
2.2 mH
J2
Neutral 1
C1 + C2 +
2.2 mF/
400 V
2.2 mF/
400 V
IC1
C3
1
FB
10 nF
C4
2 _CT
56 pF
11 k R2
R1
2.7
3 _CS
4 _GND
NCP1215
C8 1 nF/Y
R3
2M7
100 nF
R4
2M7
NC1 ⁸ X
NC2 ⁷ X
V_CC ⁶
Gate ⁵
C5
D5
R7
LL4448
R6 ^{47 k}
47 k 1 nF/
R5
500 V
220
C6
C7
D8
MURA160T3
100 nF
Q1
MTD1N60
T1
48
35
1
2
L2
D9 _MBRS360T3
C9 +
4.7 mH
470 mF/
R8
16 V
220
10 mF/
16 V
R9
1k
BZX84C5V6
D7
J3
1 ^{+6.5 V@}
800 mA
+
C10
J4
1 GND
ISO1
PC817
Figure 21. Adaptor Application Schematic
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.
The CT voltage at no load condition is depicted in
Figure 23.
Figure 22. CT Voltage at Full Load Condition
Figure 23. CT Voltage at No Load Condition
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