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Part Name
Description
FAN7621S View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
FAN7621S
PFM Controller for Half-Bridge Resonant Converters
Fairchild Semiconductor
FAN7621S Datasheet PDF : 13 Pages
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Application Circuit Diagram
Cr
V
IN
V
CC
V
O
LV
CC
HV
CC
Rmax
Rmin
R
T
Rss
HO
CTR
AR
Css
LO
CS
SG PG
Figure 1. Typical Application Circuit (LLC Resonant Half-Bridge Converter)
Block Diagram
V
re f
I
R T
R
T
8
V
re f
I
R T
3V
2I
R T
1V
2V
AR
6
5k
V
C s s H
/ V
C s s L
LV
CC
12
S
Q
R
D ivider
LV good
CC
V
re f
L U V+ / L U V-
In tern al
B ias
T im e
D elay
3 5 0n s
Level
S hifter
H UV+ / H UV-
H ig h S ide
Gate D river
T im e
D elay
3 5 0n s
B alancin g
D elay
L ow S ide
Gate D river
1
HVcc
3
HO
2
CTR
14
LO
L V
C C
V
O V P
LV g o od
CC
TSD
D elay
50ns
D elay
1.5µs
S
Q
R
Sh utd own with o ut delay
V
A O C P
V
O C P
-1
16
PG
10
SG
9
CS
Figure 2. Internal Block Diagram
© 2009 Fairchild Semiconductor Corporation
FAN7621S • Rev. 1.0.1
2
www.fairchildsemi.com
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