FSQ0565RS Fairchild Semiconductor, FSQ0565RS Datasheet - Page 3

• Manufacturer Part Number: FSQ0565RS
• Description: A Quasi-Resonant Converter (QRC) generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency
• Manufacturer: Fairchild Semiconductor

FSQ0565RS/RQ Rev. 1.0.3
© 2008 Fairchild Semiconductor Corporation
Block Diagrams
FB
FB
4
4
V
CC
V
V
V
V
V
V
OSP
OVP
V
SD
V
CC
OSP
OVP
SD
CC
I
delay
I
t
delay
ON
after SS
t
ON
after SS
V
< t
V
ref
< t
ref
OSP
I
FB
OSP
I
FB
0.35/0.55
0.35/0.55
V
LPF
V
LPF
Burst
Burst
3R
3R
Figure 3. Internal Block Diagram of FSQ0565RQ
Figure 2. Internal Block Diagram of FSQ0565RS
R
R
LPF
Sync
LPF
Sync
Soft-
Start
5
Soft-
Start
5
TSD
TSD
AVS
AVS
PWM
PWM
V
V
CC
CC
good
good
250ns
LEB
250ns
OSC
LEB
OSC
3
S
R
S
R
S
R
Q
Q
S
R
Q
Q
Q
Q
Q
Q
V
6
V
str
6
str
V
V
ref
ref
V
V
CC
AOCP
CC
AOCP
good
good
driver
Gate
driver
Gate
(1.1V)
V
V
(1.1V)
8V/12V
V
OCP
V
3
CC
8V/12V
OCP
3
FSQ0565RS Rev.00
CC
FSQ0565RQ Rev.00
Drain
Drain
1
1
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2
2
GND
GND