MOSFETs cut system costs in LCD TVs

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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Related Info

What is a MOSFET?
Metal Oxide Semiconductor Field Effect Transistor, or simply MOSFET, is the most commonly used field effect transistor for both analog and digital circuits. It is composed of two channels: n-type or p-type semiconductor materials, accordingly referred to as NMOSFET and PMOSFET.

What does LCD stand for?
A display technology that uses rod-shaped molecules (that flow like liquid and bend light. Unenergized, the crystals direct light through two polarizing filters, showing a natural background color. When energized, the crystals redirect the light to be absorbed in one of the polarizers, causing the dark appearance of crossed polarizers to show. The contrast and viewing angle improve as the molecules are twisted further.

MOSFETs cut system costs in LCD TVs

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