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New from Supertex, the HV9989 is a three channel, boost LED driver integrated circuit (IC) that can drive LEDs in LCD backlighting applications. It features the company’s patented PWM dimming control algorithm that individually regulates each channel’s output current down to sub-microsecond dimming pulses, which permits dimming at frequencies outside the audible range (>20kHz) without any shift in the “white point” or the colorcorrelated temperature. It drives strings of either RGB LEDS or multiple strings of white LEDs.
HV9989 drives SEPIC converters in either continuous-conduction mode (CCM) or discontinuous-conduction mode (DCM). It features independent short and open-circuit protection for each channel and three 1MHz Tran conductance amplifiers with tri-state outputs to close feedback loops and accurately control the LED current. It is powered by a built-in 40V linear regulator.
“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, Vice President of Marketing at Supertex. “The IC combines line and load regulation in a multi-channel 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). Samples are available from stock.
