Folks,
Using the class D amp driver chip IRS20214. When operating at a duty cycle of 3% and above everything is as clean as a whistle. Same at 1% unless I drive it with an LTC6992 but that's another story. Anyhow, at around 2% is seems to generate a secondary spike at its input when the bootstrap node flies. I can muffle it with a cap across the pin but since it apparently "strikes" inside this does not prevent double tripping. I am operating it around 150V supply, well within its means.
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Tried shielding the IC itself and so on, nothing helped.
Has anyone used this and ran into similar stuff? Any idea why this doesn't happen at other duty cycles?
I am also wondering how anyone could use IRS as the suffix for an IC :-)