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High frequency MOSFET Driver

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T3sl4co1l:
Yup, that's another way to help reduce quiescent current while improving switching performance.  The downside is, supply ripple is coupled in by the same capacitor, so you need good bypassing.

The extreme case of this is a bootstrap gate driver where the level shifter must be inverting, or balanced -- if it's noninverting, it gets stuck as the rising or falling bootstrap supply, plus node capacitance, dominates over the intended signal current.  This actually helps if it's assisting the intended switching edge, but it doesn't take much ripple or bounce on the supply to cause unintended triggering of the high side gate, and then you get mysterious shoot-through events and hair-pulling.



Tim

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