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3-channel LED driver promises stability, efficiency

Posted: 01 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converters? LED drivers? voltage converters?

Linear Technology Corp. has made available a triple-output DC/DC converter that can drive up to 24 x 500mA LEDs at efficiencies up to 96 percent. All three channels of the 2MHz LT3496 are controlled by an independent True Color pulse width modulator signal, enabling each to be dimmed independently to ratios as high as 3,000:1. A fixed-frequency, current-mode architecture ensures stable operation over a range of supply and output voltages. A frequency-adjust pin enables the user to program the frequency between 330-2.1MHz to optimize efficiency while minimizing external component size.

The LT3496 senses output current at the high side of the LED, enabling buck, buck-boost or boost configurations. With an external sense resistor, the user programs the output-current range of each channel. Each of the three independent driver channels uses an internal 750mA, 45V npn switch and has a built-in gate driver for PMOS disconnect.

Pricing starts at $3.50 each in 1,000-piece quantities.

- Emily Gleason

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