FSQ500N — Green Mode Fairchild Power Switch (FPS™)
October 2009
FSQ500N
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
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
Description
The FSQ500N is specially designed for low cost, small
set-top box, DSL, home appliance auxiliary power
supplies. This device combines a 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 FSQ500N reduces total size
and weight, while increasing efficiency, productivity, and
system reliability. This device provides a basic platform
for cost-effective flyback converters.
Applications
STB and DSL Power Supply
Home Appliance, IH Cooker, Auxiliary Power
Supply
Maximum Output Power
230V
AC
± 15%
Adapter
4.0W
(3)
(2)
(1)
85-265V
AC
Adapter
3.5W
(3)
Related Resources
AN-4137-Design Guidelines for Off-line Flyback
Converters using FPS
AN-4141-Troubleshooting and Design Tips for
Fairchild Power Switch (FPStm) Flyback
Applications
AN-4147-Design Guidelines for RCD Snubber of
Flyback
AN6075- (Flyback) -AN-6075-Compact Green-
Mode Adapter Using FSQ500L for Low Cost
Open
(4)
Frame
6.5W
Open
(4)
Frame
5.5W
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
FSQ500N
Operating
Temperature Range
-40°C to +85°C
Eco
Status
RoHS
Package
8-Lead, Molded Dual Inline Package
(MDIP), JEDEC MS-001, .300 Inch Wide
Packing
Method
Rail
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FSQ500N • Rev. 1.0.0
www.fairchildsemi.com
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
