Supertex Inc. (Sunnyvale, CA) debuted its new HV9923, a three-pin, switch-mode LED driver IC with a regulated output current of 30 mA that can be operated from either a rectified universal ac line range of 85 Vac to 264 Vac or 20 Vdc to 400 Vdc. The new pulse-width modulated (PWM), peak current controller is suitable 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 30 mA current to the LED string. The family of three-pin, switch-mode LED drivers now includes regulated current options of 20 mA, 30 mA, and 50 mA, all of which can drive LED strings to 80 percent of the input voltage. All products in the new family (including the HV9921, HV9922, and HV9923) are available in "green," 100-percent, RoHS-compliant packaging.
Priced at $0.52 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 four to six weeks ARO.
