Typical Application Diagrams
VOUT
VIN
B2
B1
A2
A1
BIAS
FAN3122
FAN3122
From A2
From A1
SR EN
1
2
3
4
1
2
3
4
8
7
6
5
8
7
6
5
VDD
IN
SR EN
EN
VDD
IN
VDD
VDD
OUT
OUT
OUT
OUT
EN
PGND
PGND
AGND
AGND
Figure 53. Full-Bridge Synchronous Rectification
VOUT
VIN
PWM
VBIAS
FAN3121
1
2
3
4
8
7
6
5
VDD
IN
VDD
P1
(AGND)
OUT
SR Enable
Active HIGH
EN
OUT
AGND
PGND
Figure 54. Hybrid Synchronous Rectification in a Forward Converter
© 2008 Fairchild Semiconductor Corporation
FAN3121 / FAN3122 • Rev. 1.0.2
www.fairchildsemi.com
17