SG6846A — Highly Integrated Green-Mode PWM Controller
Reference Circuit
P1
F1
RT1
t
2
2
4
3
1
CY1
CX1LF2
BD1
1
2
5
R16
D4
TX1
13
3
6
+
1
2
2
VZ1
P2
P7
1
3
4
2
2
LF1 CY2
R8
3
1
C2
R12 C4
D2
1
2
C16
+
1
+
C12
10
1
7
1
3
9
R1
R2
R3
2
R9
D1
1
+
21
2
+
C11
R17
P16V
P16V
L2
2
2
11
1
2
3
L4
D3
12
2
1
2
CX2
4
P32V
P32V
L1
32V
C13
+
32V
C17
+
D5
1
+
C14
1
1
1
U1
1
GND
FB
VIN
RI
GATE
VDD
SENSE
RT
8
7
6
5
2
R13
R6
R10
NTC1
C6
Q1
1
2
FB
2
2
3
L3
R14
P16V
C1
1
+
R5
4
R7
1
3
P16V
R15
4
1
FB
FB
P16V
P32V
C7
3
C9
U2
2
K
R
P16V
R18
R19
R21
P32V
R20
U3
A
Figure 21. Application Circuit for 32V / 16V Output
BOM
Part No.
R1, R2, R3, R4
R8, R9
R5
R15
R13
R18
R21
R7
R6
R19
R14
R16, R17
R11
R12
R20
R22
Value
470KΩ +/-5%
S1MΩ +/-1%
16K2Ω +/-1%
1K5Ω +/-5%
10Ω +/-5%
4K7Ω +/-5%
15KΩ +/-1%
27KΩ +/-5%
330Ω +/-1%
102KΩ +/-1%
0Ω22 +/-5%
1W 20Ω +/-5%
20KΩ +/-5%
100KΩ +/-5%
887KΩ +/-1%
10KΩ +/-1%
Part No.
C4
C10,C11
C6,C7
C9
C14,C17
C15
C13,C16
C2
C1
C3
CX1
C8
C5
CX2
D1
D2
Value
103 P 630V
102 P 1KV
102 P 50V
222 P 50V
470µ 25V
220µ 25V
220µ 50V
150µ 400V
4.7µ 50V
10µ 50V
X1 0.47µ 275V
Y2 222P 250V
100µ 50V
X2 0.1µF 275V
1N4148
BYV95C
Part No.
D3
BD1
D4
D5
F1
L1,L2
L4
U3
U1
U2
Q1
TX1
RT1
VZ1
Value
FR103 1.0A 200V
DBL406G
BYT28-300
BYV32-150
250V4A QUICK
1.8µH
10µH
TL431 +/-1%
SG 6846
PC817
7NB60
EI-33
SCK053
14ψ 470V
© 2008 Fairchild Semiconductor Corporation
SG6846A • Rev. 1.1.4
www.fairchildsemi.com
13
1
2
R4
C3
C5
R11
16V
16V
+
C15
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
