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PATENTED, ISOLATED LED DRIVER FROM SUPERTEX PROVIDES HIGH CURRENT ACCURACY WITH MINIMUM PARTS

Mar 03, 2011

Supertex


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SUNNYVALE, Calif., March 3, 2011 – Supertex (Nasdaq GS: SUPX), a recognized
leader in high voltage analog and mixed signal integrated circuits (ICs), today
introduced HV9971, a patented, isolated, constant current LED driver for solid-state
lighting applications. HV9971 has a current accuracy of +/-3% and is ideally suited to
control isolated, flyback topologies to enable solid-state lighting fixtures to meet UL
compliance for galvanic isolation.

The IC utilizes primary side current sensing for reduced component count,
circuit size and cost; and is still able to achieve highly accurate output current
regulation. Supertex’s patented approach maintains current accuracy while the IC is
insensitive to external component tolerances and does not require an optocoupler.
The HV9971 LED driver accepts AC input voltages of 80-264V and is optimized for
operation at a constant frequency of 100kHz.

“HV9971 requires no secondary current sensing components, making it an ideal
solution for reducing board size and parts counts in LED lighting applications,” states
Stephen Lin, Vice President of Marketing for Supertex. “This IC is particularly well
suited for incandescent bulb replacement applications where galvanic isolation is
required.”

The HV9971 is available in an 8-lead SOIC package (HV9971LG-G). The part
is RoHS compliant. Samples are available from stock. Lead-time for production
quantities is 4-6 weeks ARO. Pricing is US$0.88 each for the HV9971LG-G in 1K
quantities.

About Supertex
Supertex, Inc. is a publicly held mixed signal semiconductor manufacturer,
focused in high voltage analog and mixed signal products for use in the medical, LED
lighting, display, industrial, and telecommunication industries. Supertex product,
corporate and financial information is readily available at www.supertex.com.
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