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Supertex LED driver IC delivers 30mA regulated output current

Posted: 05 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:supertex? hv9923? led driver ic? driver ic? hv9923n3-g?

A 3-pin switch-mode LED driver IC with a regulated output current of 30mA was recently unveiled by Supertex Inc. The new HV9923 can be operated from either a rectified universal AC line range of 85Vac to 264Vac or 20Vdc to 400Vdc.

According to the company, the pulse width modulated (PWM) peak current controller is ideal for driving multi-LED strings in off-line applications such as decorative lighting, architectural lighting, signage and incandescent replacements.

With an internal MOSFET (or Power Switch), the HV9923 reduces the external part count in LED designs to four components (excluding an EMI filter). The device is a fixed off-time PWM control IC that incorporates constant peak current feedback to maintain delivery of a 30mA current to the LED string.

"The introduction of the HV9923 further strengthens Supertex's family of high-voltage LED drivers and provides a wider variety of options for designers," commented Ahmed Masood, marketing director at Supertex. "Designs utilizing 30mA versions of LEDs are becoming increasingly popular and this product is an ideal solution for those applications."

Supertex's family of 3-pin switch mode LED drivers now includes regulated current options of 20-, 30- and 50mA, all of which can efficiently drive LED strings to 80 percent of the input voltage. All products in this family (including the HV9921, HV9922 and HV9923) are available in "green," 100 percent RoHS-compliant packaging.

Priced at 52 cents each in 1,000-unit quantities, the HV9923 is available in TO-92 (HV9923N3-G) and SOT-89 (HV9923N8-G) packages. Samples are available from stock. Lead time for production quantities is 4 to 6 weeks ARO.

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