Managing DC/DC thermals in high-current, high-ambient temperature applications


February 21, 2020
Wireless basestations and military communications equipment are examples of applications that require significant output current from a point-of-load DC/DC converter without the luxury of air flow to keep the device cool. In rugged outdoor environments, ambient temperatures may reach 85C or greater. Most integrated-FET DC/DC converters do not have the ability to operate at these high ambient temperatures without significant de-rating of the output current. As a result, many designers sacrifice solution size and build their power supply around a multi-phase buck controller to spread the heat across the discrete controller and FET ICs. The new TPS546D24A 16V, 40A buck converter gives these designers an alternative that eliminates this trade-off. With its unparalleled thermal performance, TPS546D24A not only is able to output a full 40A at 85C, but does so with much smaller solution size and greater simplicity than competing multiphase controllers. Watch the video to see a demo of TPS546D24A operating at 85C without any current de-rating. 

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