25 May '16, 11am

More on: TI’s unique 10MHz dc-dc topology: Texas Instruments has unveiled a dc-dc topology, for ...

More on: TI’s unique 10MHz dc-dc topology: Texas Instruments has unveiled a dc-dc topology, for ...

The target was to shrink a high-current dc-dc converter; and the best known path to small size is to increase switching frequency to reduce the need for large inductors and capacitors. However, the standard buck converter is a hard-switched topology, which means that its mosfets are both passing current and have a voltage across them as they turn on or off. As turn-off and turn-on are not instantaneous, for a few tens of nanoseconds during each transition the mosfets act like resistors. This causes small but finite ohmic losses. Higher frequency operation means more transitions and therefore more losses, and at something like 1MHz (with silicon mosfets) these ohmic switching losses become a significant chunk of total losses. TI has been working on a topology that allows most of its mosfets to operate at half the input voltage, more than halving switching losses, TI energy ...

Full article: http://www.electronicsweekly.com/news/design/more-on-tis-...

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