The FSFR series from Fairchild is a complete integrated circuit with controller, high/low side drivers and two MOSFETs. It forms the main building block of a half-bridge LLC resonant converter.
LLC resonant converters are used in power supplies from 100 W to 1 kW and feature efficiencies above 90%. They work best with a narrow input voltage range, for example 195 V a.c. to 265 V a.c., or alternatively with a front end power factor correction (PFC) stage.
Standard series resonant converters have excellent full-load efficiency, but suffer from reduced efficiency at lighter loads as the switching frequency increases greatly. LLC resonant converters are a simple development of series resonant converters. Series resonant converters use one inductor (L) and one capacitor (C). LLC converters use a second, uncoupled inductor to greatly reduce the dependency of the switching frequency on the load. They are therefore highly efficient at a wide range of loads.
In the FSFR family, the method of switching is zero voltage switching (ZVS), which results in very low EMI and very high efficiency. The diodes in the MOSFETs have fast recovery times which allows small dead-bands in the switching cycles, further improving efficiency. In addition to the LLC resonant converter, the FSFR family can be applied to series resonant converters and parallel resonant converters.
The devices feature variable frequency control with 50% duty cycle for half-bridge resonant converter topologies, fast recovery times of the internal MOSFETs and a fixed dead time of 350 ns. They implement pulse skipping for frequency limit at light load conditions, offer remote ON/OFF control and integrate protection functions such as over-voltage, overload, over-current and thermal shutdown.
Typical applications include industrial power supplies, telecom power supplies, audio power, LCD and PDP television sets, industrial PCs and servers, and power adapters.
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