Data Sheet

© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSQ500L • Rev. 1.0.3 2
FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™)
Application Circuit Diagram
D
GNDV
FB
V
CC
AC
IN
DC
OUT
PWM
Figure 1. Typical Application Circuit
Internal Block Diagram
S
R
Q
OSC
R
sense
(0.3V)
OLP
TSD
LEB
I
FB
I
8R
R
250ns
V
REF
UVLO
HV/REG
1
D
6.5V
HV/REG OFF
4
GND
2
V
CC
3
V
FB
V
BURL
/V
BURH
V
OLP
A/R
S
R
Q
V
CC
V
CC
Soft-Soft
7.7V
Z
I
DELAY
VSD
(BURST MODE:I
FB
/2)
Figure 2. Internal Block Diagram