No Heatsink Needed for 200-W Buck-Boost Supply

by Henry Zhang, Applications Engineering Manager, Linear Technology, Milpitas, Calif., Power Electronics Technology, Jul 01 2008

Focus:
In this Power Design article, a circuit based on the LTC3780 controller IC implements a single-stage, single-inductor nonisolated, synchronous buck-boost converter with small size and high efficiency. Operating from a 36-V to 72-V telecom input voltage range, this buck-boost converter generates a 48-V output at 4 A (200 W). The converter's efficiency is greater than 95% over load and input voltage ranges, enabling operation without a heatsink or forced air cooling. This circuit includes a 100-V high-side driver that extends the input- and output-voltage range of the controller IC, making it suitable for telecom or automotive systems. Details of circuit operation relating to timing of gate-drive signals, required delay circuitry, and deadtime are discussed.

What you’ll learn:

• How to build a 200-W nonisolated, buck-boost converter that converts a 36-V to 72-V input to 48-V output with small size and high efficiency.

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