Products, Materials + Tools | Mar 16, 2011

Supertex HV9860 Reduces System Cost & Complexity through Wiring Fault Protection Feature

Supertex, Inc., a recognized leader in high voltage analog and mixed signal integrated circuits (ICs), today introduced HV9860, a boost LED driver that is designed to optimize LED performance and extend LED life in applications such as RGB or white LED backlighting, LCD TVs and monitors, and LED lamps for general lighting. The IC uses a peak current mode control scheme and includes an internal transconductance amplifier to accurately control output current over all line and load conditions.

Features:
• Switch mode controller for boost and flyback converters
• Discontinuous conduction mode of operation
• High output current accuracy
• Internal ±2% voltage reference (0OC <TA < 85OC)
• Internally fixed 100kHz switching frequency
• Hiccup mode protection for both short circuit and open circuit conditions
• LED wiring fault detection to detect short cathodeto ground condition

Applications:
• DC/DC LED driver applications
• RGB or white LED backlight applications
• Flat panel display backlighting

HV9860 also includes LED wiring fault detection, which protects an LED string from high current in cases of accidental short circuit from any tap in the string to ground. A wiring fault scenario is created, for example, during production when a wire connecting the LEDs gets shorted to the chassis, and, as a result, a very high current is delivered to the operating LEDs. The built-in protection provided by HV9860 identifies this scenario and shuts the IC down as well as signaling a fault to the rest of the circuit.

“Supertex’s HV9860 gives users protection for their LED strings without the system complexity and additional cost of adding a high side current sensor externally,” states Stephen Lin, Vice President of Marketing for Supertex. “Implementing the IC in LED backlighting and general lighting circuit designs simplifies the manufacturing process, such as in LCD TV monitors and light bulb production.”

HV9860 is available in a 16-lead SOIC package (HV9860NG-G). The part is RoHS compliant. Samples are available now. Lead-time for production quantities is 4-6 weeks ARO. Pricing is US$0.95 each for the HV9860NG-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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