Do you have a half-bridge driver with the facility to disable the lower FET automatically if its drain voltage is above zero, so that it can make a Synchronous buck go into discontinuous mode at low current?
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Hi Ian,
Some of the lower voltage buck drivers have a feature like this. One is the TPS283X family, another is UCC27222, and TPS51604.
In terms of drain sensing in general, its more common on these low-voltage devices. It is harder to implement on higher voltage half-bridges like our >100V drivers.
Thanks,
Alex M.