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LED drivers with PWM dimming for LCD backlight

Posted: 09 Feb 2012 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? LCD backlight? PWM dimming?

Supertex Inc. has unleashed a three channel, boost LED driver IC engineered for LCD backlighting applications. The HV9989 features the company's PWM dimming control algorithm that individually regulates each channel's output current down to sub-microsecond dimming pulses. It allows dimming at frequencies outside the audible range (>20kHz) without any shift in the 'white point' or the color-correlated temperature.

The device drives strings of either RGB LEDS or multiple strings of white LEDs and boost or SEPIC converters in either continuous-conduction mode (CCM) or discontinuous-conduction mode (DCM).

HV9989

The HV9989 is powered by a built-in 40V linear regulator.

It features independent short- and open-circuit protection for each channel and three 1MHz transconductance amplifiers with tri-state outputs to close feedback loops and accurately control the LED current, noted Supertex. It is powered by a built-in 40V linear regulator, added the company.

"HV9989 can operate with very high dimming frequency and deliver an over 10,000:1 dimming ratio because of its patented PWM dimming method," said Stephen Lin, VP of marketing at Supertex. "The IC combines excellent line and load regulation in a multichannel driver IC to reduce board space and system cost in LCD backlighting applications like flat screen TVs and monitors."

The HV9989 is available in a 40-lead QFN package (HV9989K6-G) at $3.78 for 1K quantities. Samples are available from stock. Lead-time for production quantities is 4-6 weeks ARO.





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