60-V, synchronous buck LED driver delivers more than 300 W of LED power

October 24, 2012 // By Paul Buckley
Linear Technology has released a synchronous buck LED driver controller that delivers more than 300 W of LED power and offers a 6 V to 60 V input voltage range suitable for applications including automotive, industrial and architectural lighting.

Similarly, the LT3763's output voltage can be set from 0 V to 55 V, enabling it to drive a wide range of LEDs in a single string. The LT3763 offers both input and output current monitors and limiting, which accurately control both input and output current.

Similarly, the LT3763 also offers accurate output voltage regulation as well as input regulation, useful for high impedance sources such as solar panels. Its constant current and constant voltage regulation makes it ideal for applications ranging from driving high brightness LEDs to battery and supercap charging. Additionally, True Color PWM dimming capability offers dimming ranges as wide as 3,000:1 for LED applications. The LT3763 is unique design utilizes four control loops to monitor input current, LED /output current, output and input voltage to deliver optimum performance and reliability.

The LT3763 uses two external switching MOSFETs and can deliver from 5 W to more than 300 W of continuous LED power with efficiencies up to 96%. LED current accuracy of ±6% ensures constant lighting while ±1.5% output voltage accuracy offers several LED protection features and also enables the converter to operate as a constant voltage/constant current source for charging applications. The LT3763 can utilize either analog or PWM dimming as required by the application. Furthermore, its switching frequency can be programmed between 200 kHz and 1 MHz or synchronized to an external clock. Additional features include open/short protection, C/10 detection, input and output current monitors, and integrated fault protection.

The LT3763EFE is available in a 28-lead thermally enhanced TSSOP package, priced starting at $4.45 each, in 1,000-piece quantities. An extended temperature version, or I grade, the LT3763IFE, is also available, priced starting at $4.90 each in 1,000-piece quantities. Furthermore, a high temperature version, or H grade, the LT3763HFE, is also available, priced starting at $5.15 each in 1,000-piece quantities. All versions are available from stock.

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