LED driver IC improves current accuracy

Supertex Inc. introduces the HV9967, an open loop, average-mode current control LED driver IC that operates in a constant off-time mode. The IC includes a 60 V, 0.8 ohm MOSFET that can be used as a stand-alone buck converter, or connected as a source driver output for driving an external MOSFET, such as Supertex DN2450, to operate at offline ac line voltages. The HV9967 features a proprietary control method that achieves fast, accurate LED current control through sensing only the switch current.

The IC delivers LED current accuracy of +/-3% without sensitivity to external component variation. It utilizes average-mode current control, which doesn’t produce a peak-to-average error, and therefore greatly improves LED current accuracy and line and load regulation without requiring loop compensation or direct current sensing. The HV9967 also includes internal over-temperature and short circuit protection, and a PWM dimming input. The HV9967 is available in an 8-lead MSOP package (HV9967MG-G).
 
For more information, contact Supertex Inc., 1235 Bordeaux Dr., Sunnyvale, CA 94089. Phone: (800) 222-9883.