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Supertex LED driver with PFC simplifies street lighting

Posted: 25 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:supertex? hv9931? driver? led?

Supertex' HV9931, an off-line driver for single high-brightness LEDs, includes a power factor correction stage that suits the chip to traffic signal, street lamp and decorative lighting applications. The fixed-frequency buckboost-buck design features built-in dimming capability.

The chip, with an internal 450V regulator design that allows the device to work off a universal AC input without the need for an input power transformer, cascades an input PFC buck-boost stage and an output buck converter power stage. The HV9931, using hysteretic peak-current control to regulate both input and output current, thus eliminates the need for loop compensation and is inherently protected from input under-voltage conditions. The chip provides a low-frequency PWM dimming input that accepts an external control signal (duty cycle 0 to 100 percent at up to several kilohertz).

The HV9931 is available in 8-pin SOIC and 8-pin DIP packages. The chip is green and RoHS compliant. It is priced at 91 cents in the 8-pin DIP and 87 cents in the SOIC, both in 1,000-unit quantities. Samples are available from stock. Lead time for production quantities is 4 to 6 weeks ARO.

- Vince Biancomano


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