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Power
Digi-Key – Four-switch 60V synchronous buck-boost LED driver controller (Linear Technology LT3791)
Sep 27 2012 - Power [More Power Articles]Available now from Digi-Key, the Linear Technology LT3791 is the latest in a growing family of high-power, high-performance LED drivers designed to simplify power delivery to high-brightness LEDs.
The four-switch buck-boost controller topology operates from input voltages above, below, or equal to the output voltage, while delivering constant currents from 1A up to tens of Amps. The LT3791 also provides ±4% LED current accuracy and ±1.5% output voltage accuracy to ensure the highest performance in LED solutions.
The controller can regulate LED currents up to 52V in LED strings with input voltages above, below, or equal to the output voltage. The constant-frequency, forced-continuous current mode architecture allows its frequency to be adjusted or synchronized from 200kHz to 700kHz. No top MOSFET refresh switching cycle is needed in buck or boost operation. With 60V input, 60V output capability and seamless transitions between operating regions, the LT3791 is seen as ideal for LED driver applications in automotive, industrial, and even battery-powered systems.
The LT3791 provides input current monitor, LED current monitor, and open or shorted LED fault protection, during which the LT3791 either restarts or latches off, says the company.
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