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MOSFETs cut system costs in LCD TVs

Posted: 29 Mar 2010 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET? LCD TV? fast recovery diode?

Fairchild Semiconductor has developed the Ultra FRFET family that optimizes LCD TV designs by providing reverse recovery time (trr) of 35ns~65ns and the reverse recovery current (1.8A ~ 3.1A). Present LCD TV designs use MOSFETs with two fast recovery diodes (FRDs) and two blocking diodes in a half-bridge circuit to initiate the non-zero voltage switching. The FRDs are used to reduce the reverse recovery current. The blocking diodes prevent the built-in diode of the MOSFET from turning on and eliminate the large reverse recovery current of the diodes. Fairchild's half-bridge solution eliminates the need for two blocking diodes and two FRDs in the half-bridge circuit, saving board space and as much as $.20 per design.

Additionally, when compared to alternate solutions offering a typical gate charge of only 16nC, the Ultra FRFET products are instrumental in reducing the turn-on and turn-off losses of the MOSFET through its significantly lower gate charge (Qg(typ) = 11nC). Fairchild's Ultra FRFET products also feature a robust dv/dt immunity of 20V/ns, ensuring reliability and strong EMI performance to protect the LCD TVs from interference.

These devices are part of a comprehensive portfolio of MOSFETs that offer designers a wide range of breakdown voltages (-500V to 1000V), state-of-the-art packaging and industry-leading FOM to deliver efficient power management anywhere electronic power conversion is needed.

Pricing varies between $0.30 to $0.80 in 1,000 quantities, depending on the device selected. Samples ar e available now. Delivery is nine to eleven weeks ARO.





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