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Q&A Design considerations for a synchronous DC/DC converter

At some point the MOSFET approach will lose to diode if current is sufficiently high: The drain-source resistance will cause the forward voltage drop to go up linearly. So picking a MOSFET with ...

posted 3y ago by Kranulis‭

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#1: Initial revision by user avatar Kranulis‭ · 2021-04-16T10:00:17Z (over 3 years ago) 
At some point the MOSFET approach will lose to diode if current is sufficiently high:

![Image alt text](https://electrical.codidact.com/uploads/XzqddeoJPhddjjc7Kx8k941k)

The drain-source resistance will cause the forward voltage drop to go up linearly. So picking a MOSFET with a small Rds would be one idea to reduce conduction losses. Checking the gate threshold voltage with which you must drive the MOSFET in order to get it turn on fully is another important thing.

![Image alt text](https://electrical.codidact.com/uploads/MDqM5qHa3k2EbkLZEPjyarrb)