Typical Application Diagrams
V IN
B2
B1
A2
A1
V OUT
BIAS
From A2
SR EN
FAN3122
FAN3122
V DD 1
8
V DD
V DD 1
8
V DD
IN
2
7
OUT
IN
2
7
OUT
From A1
3
EN
4
AGND
6
OUT
5
PGND
SR EN 3
EN
4
AGND
6
5
OUT
PGND
Figure 53. Full-Bridge Synchronous Rectification
V IN
PWM
FAN3121
V BIAS
V OUT
SR Enable
Active HIGH
V DD
IN
EN
AGND
1
2
3
4
P1
(AGND)
8
7
6
5
V DD
OUT
OUT
PGND
Figure 54. Hybrid Synchronous Rectification in a Forward Converter
? 2008 Fairchild Semiconductor Corporation
FAN3121 / FAN3122 ? Rev. 1.0.3
17
www.fairchildsemi.com
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