Buck-Boost Controller Regulates LED Output Despite Input Voltage Variations

Buck-Boost Controller Regulates LED Output Despite Input Voltage Variations:

, the Linear LT3791 and external MOSFETs can deliver 100W to power a string of LEDs (Fig. 1 ). The controller-MOSFET combination has an input range of 4.7V to 60V and an output range of 0V to 60V, along with a seamless transition between its buck and boost modes. These characteristics make it ideal for applications such as automotive, where the input voltage can vary dramatically during stop/start, cold crank and load dump scenarios, or portable battery operated systems where the battery output decreases with time. Transitions between buck, buck-boost, and boost operating modes are seamless, offering a regulated LED light output regardless of variations of supply voltage. Fig. 2 shows a typical application of the LT3791 driving a string of LEDs.

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