SG6846B Fairchild Semiconductor, SG6846B Datasheet - Page 13

• Manufacturer Part Number: SG6846B
• Description: The highly integrated PWM controller, SG6846B, provides several features to enhance the performance of fly-back converters
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
SG6846B • Rev. 1.3.4
Reference Circuit
BOM
P1
P2
P7
R1, R2, R3, R4
Part No.
R16, R17
R8, R9
F1
R15
R13
R18
R21
R19
R14
R11
R12
R20
R22
R5
R7
R6
RT1
VZ1
LF1
1W 20Ω +/-5%
470KΩ +/-5%
16K2Ω +/-1%
102KΩ +/-1%
100KΩ +/-5%
887KΩ +/-1%
S1MΩ +/-1%
1K5Ω +/-5%
4K7Ω +/-5%
15KΩ +/-1%
27KΩ +/-5%
20KΩ +/-5%
10KΩ +/-1%
330Ω +/-1%
0Ω22 +/-5%
10Ω +/-5%
CY2
CY1
Value
CX1
LF2
Figure 20. Application Circuit for 32V / 16V Output
R1
C1
+
CX2
R5
FB
R2
R3
R4
R7
4
1
2
3
4
Part No.
C10,C11
C14,C17
C13,C16
U1
GND
FB
VIN
RI
C6,C7
CX1
CX2
C15
C4
C9
C2
C1
C3
C8
C5
D1
D2
+
C3
SENSE
BD1
GATE
VDD
RT
1
R8
R9
8
7
6
5
R10
1
D1
13
+
C2
NTC1
C5
X1 0.47µ 275V
X2 0.1µF 275V
Y2 222P 250V
2
1
R12 C4
+
103P 630V
150µ 400V
102P 1KV
L4
102P 50V
222P 50V
470µ 25V
220µ 25V
220µ 50V
100µ 50V
4.7µ 50V
C6
10µ 50V
BYV95C
1N4148
R11
R13
Value
1
1
2
R6
D2
D3
1
2
2
C7
FB
L3
FB
Q1
R14
U2
5
6
7
1
3
Part No.
TX1
L1,L2
BD1
RT1
TX1
VZ1
13
10
9
11
D3
D4
D5
U3
U1
U2
Q1
F1
L4
P16V
P16V
R15
C9
1
3
1
3
U3
C11
R
D5
R18
D4
R16
P16V
R17
2
2
FR103 1.0A 200V
C16
C17
P16V
250V4A QUICK
R19
R21
TL431 +/-1%
+
+
BYV32-150
BYT28-300
P32V
P32V
P16V
P16V
DBL406G
14ψ 470V
+
+
SCK053
SG6846
C12
C14
P32V
Value
PC817
7NB60
L1
L2
1.8µH
R20
10µH
EI-33
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P32V
+
+
C13
C15
32V
16V
32V
16V