My class d IRS2092 project

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yes, agreed... but how much does it really IRS need for itself, my guess would ve not much, but at that voltage, that could easy be several W

Yeah 2-3W of resistor is needed for stable operation, but its easy to do with separate supply and less dangerous if for some reason the zener[or internal zener clamp] fails, then the chip will see near rail voltage.
 
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