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Optoelectronics/Displays??

LED ballaster has 3000:1 dimming ability

Posted: 09 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:LED ballaster? LED? dimmer? Linear? ballast?

Linear Technology touts its LT3003 as a cost-effective three-string LED ballaster with a current-matching accuracy of 3 percent and 3000:1 dimming capability.

In contrast to traditional drivers that run three separate channels with external ballast resistors that require factory calibration, the LT3003 works off a 3-40V input in the buck, boost and buck-boost modes to drive three strings of eight LEDs in parallel at 350mA per string for backlighting TFT-LCDs and heads-up displays. The chip's True Color PWM Dimming feature facilitates dimming ratios of up to 3000:1 with a logic level signal at the PWM pin and without the need for external level-shifting circuitry. The chip is suited for use with the company's LT1618, LT3474, LT3475, LT3476, LT3477 and LTC3783 LED drivers.

The LT3003EMSE, available from stock in a 10-lead thermally enhanced MSOP-10 package, is priced at $1.16 each in 1,000 pieces.

- Vince Biancomano
eeProductCenter




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? LT3003 3-Channel LED Ballaster with PWM ICs, Interface

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