Data Sheet

April 2012
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSQ500L • Rev. 1.0.3
FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™)
FSQ500L
Compact, Green Mode, Fairchild Power Switch (FPS™)
Features
 Single Chip 700V SenseFET Power Switch
 Precision Fixed Operating Frequency: 130kHz
 No-load consumption 250mW at 265V
AC
with
Burst Mode and Down to 60mW with External Bias
 Internal Startup Switch
 Soft-Start Time Tuned by External Capacitor
 Under-Voltage Lockout (UVLO) with Hysteresis
 Pulse-by-Pulse Current Limit
 Overload Protection (OLP) and Internal Thermal
Shutdown Function (TSD) with Hysteresis
 Auto-Restart Mode
 No Need for Auxiliary Bias Winding
Applications
 Cost-Effective Linear Power Supplies Replacement
 Charger and Adapter for Mobile Phone, PDA, MP3,
and Cordless Phone
Related Resources

AN4137 — Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS™)
 AN4141 — Troubleshooting and Design Tips for
Fairchild Power Switch (FPS™) Flyback
Applications
 AN-4147 — Design Guidelines for RCD Snubber of
Flyback Converters
 AN-6075 — Compact Green Mode Adapter Using
FSQ500L for Low Cost
 AN-4138 — Design Considerations for Battery
Charger Using Green Mode Fairchild Power Switch
(FPS™)
 Evaluation Board: FEBFSQ500L
Description
The FSQ500L is specially designed for a replacement of
linear power supplies with low cost. This device
combines current-mode Pulse Width Modulator (PWM)
with a senseFET. The integrated PWM controller
features include: a fixed oscillator, Under Voltage
Lockout (UVLO) protection, Overload Protection (OLP),
Leading-Edge Blanking (LEB), an optimized gate turn-
on/turn-off driver, Thermal Shutdown (TSD) protection
with hysteresis, and temperature-compensated
precision-current sources for loop compensation. When
compared to a linear power supply, the FSQ500L device
reduces total size and weight, while increasing
efficiency, productivity, and system reliability. This
device provides a basic platform for cost-effective
flyback converters.
Maximum Output Power
(1)
230V
AC
± 15%
(2)
85-265V
AC
Adapter
(3)
Open
Frame
(4)
Adapter
(3)
Open
Frame
(4)
2.5W 3.0W 2.0W 2.5W
Notes:
1. The junction temperature can limit the maximum
output power.
2. 230V
AC
or 100/115V
AC
with doubler.
3. Typical continuous power in a non-ventilated
enclosed adapter measured at 50°C ambient.
4. Maximum practical continuous power in an open
frame design at 50°C ambient.
Ordering Information
Part Number
Operating
Temperature Range
Package Packing Method
FSQ500L -40°C to +85°C 4-Lead, Small Outline Package (SOT223-4L) Tape & Reel