The FSFR-series are 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-series simplifies
designs and improves productivity, while improving performance. The FSFR-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 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 significantly
improves efficiency. The ZVS also reduces the switching noise noticeably, which
allows a small-sized Electromagnetic Interference (EMI) filter.
The FSFR-series can be applied to various resonant converter topologies; such
as series resonant, parallel resonant, and LLC resonant converters.
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