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FSFR-XS Series — Fairchild Power Switch (FPS
™
) for Half-Bridge Resonant Converter
February 2013
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)
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
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