Reference Circuit
P1
RT1
F1
R16
D4
BD1
P32V
CY1
CY2
TX1
CX1
LF2
1
3
P32V
32V
L1
VZ1
32V
+C13
4
1
5
6
13
2
CX2
+
C16 +C12
+
R8
C4
R12
LF1
P2
P7
C2
10
9
D2
D3
1
2
2
7
1
C11
R2
R9
R1
R17
3
11
D1
L4
P16V
R3
R4
1
21
12
1
3
P16V
16V16V
+C15
L2
+
+
2
R11
C3
C5
C17 +C14
+
D5
U1
Q1
L3
R13
1
2
3
4
8
7
6
5
1
GND
GATE
FB
FB
VIN
RI
VDD
SENSE
RT
R6
+
R10
C1
R5
C6
R14
P16V
NTC1
R7
P16V
R15
FB
P16V
P32V
FB
P16V
P32V
C7
C9
R18
R19 R20
U2
R
U3
R21
Figure 21. Application Circuit for 32V / 16V Output
BOM
Part No.
Value
Part No.
C4
Value
103 P 630V
102 P 1KV
102 P 50V
222 P 50V
470µ 25V
Part No.
D3
Value
R1, R2, R3, R4
R8, R9
R5
470Kꢀ +/-5%
S1Mꢀ +/-1%
16K2ꢀ +/-1%
1K5ꢀ +/-5%
10ꢀ +/-5%
FR103 1.0A 200V
DBL406G
BYT28-300
BYV32-150
250V4A QUICK
1.8µH
C10,C11
C6,C7
C9
BD1
D4
R15
D5
R13
C14,C17
C15
F1
R18
4K7ꢀ +/-5%
15Kꢀ +/-1%
27Kꢀ +/-5%
330ꢀ +/-1%
102Kꢀ +/-1%
0ꢀ22 +/-5%
220µ 25V
L1,L2
L4
R21
C13,C16
C2
220µ 50V
10µH
R7
150µ 400V
4.7µ 50V
U3
TL431 +/-1%
SG 6846
R6
C1
U1
R19
C3
10µ 50V
U2
PC817
R14
CX1
X1 0.47µ 275V
Y2 222P 250V
100µ 50V
Q1
7NB60
R16, R17
R11
1W 20ꢀ +/-5%
20Kꢀ +/-5%
100Kꢀ +/-5%
887Kꢀ +/-1%
10Kꢀ +/-1%
C8
TX1
RT1
VZ1
EI-33
C5
SCK053
R12
CX2
X2 0.1µF 275V
1N4148
14ψ 470V
R20
D1
R22
D2
BYV95C
© 2008 Fairchild Semiconductor Corporation
SG6846A • Rev. 1.1.4
www.fairchildsemi.com
13
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