Data Sheet

February 2013
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSFR-XS Series • Rev.1.0.2
FSFR-XS Series — Fairchild Power Switch (FPS
™
) for Half-Bridge Resonant Converter
FSFR-XS Series — Fairchild Power Switch (FPS™)
for Half-Bridge Resonant Converters
Features
 Variable Frequency Control with 50% Duty Cycle
for Half-Bridge Resonant Converter Topology
 High Efficiency through Zero Voltage Switching (ZVS)
 Internal UniFET™ with Fast-Recovery Body Diode
 Fixed Dead Time (350 ns) Optimized for MOSFETs
 Up to 300 kHz Operating Frequency
 Auto-Restart Operation for All Protections with
External LV
CC
 Protection Functions: Over-Voltage Protection
(OVP), Over-Current Protection (OCP), Abnormal
Over-Current Protection (AOCP), Internal Thermal
Shutdown (TSD)
Applications
 PDP and LCD TVs
 Desktop PCs and Servers
 Adapters
 Telecom Power Supplies
Description
The FSFR-XS series includes highly integrated power
switches designed for high-efficiency half-bridge
resonant converters. Offering everything necessary to
build a reliable and robust resonant converter, the FSFR-
XS series simplifies designs while improving productivity
and performance. The FSFR-XS series combines power
MOSFETs with fast-recovery type body diodes, a high-
side gate-drive circuit, an accurate current controlled
oscillator, frequency limit circuit, soft-start, and built-in
protection functions. The high-side gate-drive circuit has
common-mode noise cancellation capability, which
guarantees stable operation with excellent noise
immunity. The fast-recovery body diode of the MOSFETs
improves reliability against abnormal operation
conditions, while minimizing the effect of reverse
recovery. Using the zero-voltage-switching (ZVS)
technique dramatically reduces the switching losses and
significantly improves efficiency. The ZVS also reduces
the switching noise noticeably, which allows a small-
sized Electromagnetic Interference (EMI) filter.
The FSFR-XS series can be applied to resonant
converter topologies such as series resonant, parallel
resonant, and LLC resonant converters.
Related Resources
AN4151 — Half-Bridge LLC Resonant Converter Design
Using FSFR-Series Fairchild Power Switch (FPS
TM
)
Ordering Information
Part Number Package
Operating
Junction
Temperature
R
DS(ON_MAX)
Maximum Output Power
without Heatsink
(V
IN
=350~400 V)
(1,2)
Maximum Output
Power with Heatsink
(V
IN
=350~400 V)
(1,2)
FSFR2100XS
9-SIP
-40 to +130°C
0.51 
180 W 400 W
FSFR1800XS
0.95 
120 W 260 W
FSFR1700XS
1.25 
100 W 200 W
FSFR1600XS
1.55 
80 W 160 W
FSFR2100XSL
9-SIP
L-Forming
0.51 
180 W 400 W
FSFR1800XSL
0.95 
120 W 260 W
FSFR1700XSL
1.25 
100 W 200 W
FSFR1600XSL
1.55 
80 W 160 W
Notes:
1. The junction temperature can limit the maximum output power.
2. Maximum practical continuous power in an open-frame design at 50C ambient.