Data Sheet

www.onsemi.com
17
FAN3121 / FAN3122 — Single 9-A High-Speed, Low-Side Gate Driver
Typical Application Diagrams
Figure 53. Full-Bridge Synchronous Rectification
Figure 54. Hybrid Synchronous Rectification in a Forward Converter
V
IN
V
OUT
From A2
From A1
A1
A2
B1
B2
V
DD
IN
AGND
OUT
OUT
V
DD
PGND
1
2
3
6
7
8
4
5
SR EN
BIAS
V
DD
IN
AGND
OUT
OUT
V
DD
PGND
1
2
3
6
7
8
4
5
EN
SR EN
EN
FA N3122
FAN3122
V
BIAS
V
IN
FAN3121
PWM
V
OUT
SR Enable
Active HIGH
1
2
3
4 5
6
7
8
V
DD
IN
EN
AGND
V
DD
OUT
OUT
PGND
P1
(AGND)