LED driver provides high current accuracy

Targeting solid-state lighting applications, the HV9971 isolated, constant-current LED driver has a current accuracy of ±3%. It is ideally suited to control isolated, flyback topologies to enable solid-state lighting fixtures to meet UL compliance for galvanic isolation.

The IC uses primary-side current sensing for reduced component count, circuit size, and cost. It requires no optocoupler. The HV9971 accepts ac input voltages of 80-264V and is optimized for operation at a constant frequency of 100 kHz. It also features output open-circuit protection, output short-circuit protection, input undervoltage lockout, and PWM dimming / enabling. The RoHS-compliant part is available in an 8-lead SOIC package. ($0.88 ea/1,000 — samples available now; prod qty, 4 to 6 weeks ARO.)

By Christina Nickolas

Supertex , Sunnyvale , CA
Kenneth Vickers 408-222-4810

http://www.supertex.com