Data Sheet

February 2013
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSFR2100 • Rev.1.1.0
FSFR2100 — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converters
FSFR2100 —
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 SuperFET™s with Fast-Recovery Type
Body Diode (t
rr
=120 ns)
 Fixed Dead Time (350 ns) Optimized for MOSFETs
 Up to 300kHz Operating Frequency
 Pulse Skipping for Frequency Limit (Programmable)
at Light-Load Condition
 Remote On/Off Control Using Control Pin
 Protection Functions: Over-Voltage Protection
(OVP), Over-Load Protection (OLP), 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
 Audio Power Supplies
Description
The FSFR2100 is a highly integrated power switch
designed for high-efficiency half-bridge resonant
converters. Offering everything necessary to build a
reliable and robust resonant converter, the FSFR2100
simplifies designs and improves productivity, while
improving performance. The FSFR2100 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
a 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 the reverse
recovery. Using the zero-voltage-switching (ZVS)
technique dramatically reduces the switching losses and
efficiency is significantly improved. The ZVS also
reduces the switching noise noticeably, which allows a
small-sized Electromagnetic Interference (EMI) filter.
The FSFR2100 can be applied to various resonant
converter topologies, such as: series resonant, parallel
resonant, and LLC resonant converters.
Related Resources

AN-4151 — Half-Bridge LLC Resonant Converter
Design Using FSFR2100 Fairchild Power Switch
(FPS
™
)
 Evaluation Board: FEBFSFR2100_D015v1
Ordering Information
Part
Number
Package
Operating
Junction
Temperature
RDS
(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)
FSFR2100 9-SIP -40 to +130°C
0.38 
200 W 450 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.