Bipolar junction transistors boost HDTV: News from Fairchild Semiconductor

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Fairchild Semiconductor has released its next generation of horizontal deflection transistor (HDTR) products. The advanced, bipolar junction transistors boast high-voltage, 1500 and 1700V capability, and high switching speeds required for high-resolution monitors and wide-screen TVs. For horizontal deflection applications bipolar transistors are preferable to IGBTs because of their low cost and faster turn-off switching speed capabilities without tailing.

The power loss and base drive of the power transistor are crucial factors in the design of the power circuit.

Fairchild's HDTR family meets the needs of colour monitors (up to horizontal frequency of 130kHz) and colour TVs (up to 34in wide) with high speed, low switching loss, low saturation voltage (less than 3V), and high voltage capability in a range of current ratings.

Other features of these next-generation HDTRs include a thinner epitaxial layer and an optimised cell design using a hollow multiple emitter structure.

This allows a high current capability and wider safe operating area, and lower power loss.

Decreased base spread resistance in these transistors also allows a wide driving range for simplified design of the horizontal deflection circuit.

In addition, lifetime control through electron-irradiation provides uniform switching speed, typically 0.1us, and stable parameter distribution.

The HDTRs are available in the fully isolated TO-3PF and TO-264 packages.

Products have collector-base breakdown voltage ratings of 1500V in a range of currents from 10 to 25A, and 1700V at 20A to support various size TVs, including HDTVs, large screen and projection TVs and monitors.

Samples and production quantities are available now.

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