Products, Materials + Tools | Dec 14, 2012

Supertex's New Isolated LED Driver HV9973 Requires No Secondary Components

Supertex, a recognized leader in high voltage analog and mixed signal integrated circuits (ICs), today introduced HV9973—a patented, isolated, constant current LED driver for use in high voltage solid-state lighting applications such as incandescent bulb retrofits. The IC achieves +/-3% current accuracy through patented primary side current sensing and has internal over voltage and short circuit protection. This sensing approach eliminates the need for secondary sensing components, thus reducing component count, circuit size and cost. The patented control technique also makes the output current setting insensitive to most component tolerances and parasitic without the need of an opto-coupler feedback.

Features:
•    Programmable true constant current operation
•    ±3% LED current accuracy
•    Adaptive to external component tolerances and parasitics
•    Primary-side current sensing
•    Output open circuit protection
•    Output short circuit protection
•    Input under voltage lockout
•    PWM dimming / enable
•    280-400VDC input

Applications:
•    Lighting fixtures with 6-50W power range

“HV9973 utilizes a patented primary-side output control technique that maintains 3% control of the LED current setting and features tight line and load regulation,” states Alex Mednik, Director of Applications Engineering for Supertex. “The IC also offers a logic input for dimming LED light output by low frequency pulsewidth modulation of the output current.”

HV9973 is available in a RoHS compliant 8-lead SOIC package (HV9973LG-G). Samples are available from stock. Lead-time for production quantities is 4-6 weeks ARO. Pricing is US$1.62 each for HV9973LG-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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