FSCQ0565RT Fairchild Semiconductor, FSCQ0565RT Datasheet - Page 3

• Manufacturer Part Number: FSCQ0565RT
• Description: A Quasi-Resonant Converter (QRC) typically shows lower EMI and higher power conversion efficiency compared to conventional hard-switched converter with a fixed switching frequency
• Manufacturer: Fairchild Semiconductor

FSCQ-Series Rev. 1.1.2
Internal Block Diagram
V
FB
4
Vovp
I
V
delay
V
V
Sync
Burst
SD
CC
Soft Start
I
BFB
Normal Operation
Vref
Threshold
Vref
Figure 2. Functional Block Diagram of FSCQ-Series
Sync
Burst Mode
5
4.6V/2.6V: Normal QR
3.0V/1.8V: Extended QR
Controller
I
FB
2.5R
+
-
Burst Switching
(V
V
R
CC
CC
good
Vref
= 9V)
I
B
Quasi-Resonant
(QR) Switching
Controller
OSC
PWM
S
R
3
Q
Q
600ns
LEB
S
R
Q
Q
fs
Auxiliary
Operation
Q
Q
Vref
Normal
V
R
S
CC
good
Power Off Reset (V
+
-
AOCP
Vcc
3
Driver
Gate
TSD
9V/15V
Main Bias
Internal
Bias
CC
Vocp
= 6V)
Drain
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1
2
GN
D