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Bootstrap hi side drive chips dont let negative voltages...why do they care?

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Flyback

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I'm surprised at your reading skills. Did you read the first paragraph on the first page? Especially sentence 3? Where it states the high side works with either a bootstrap or isolated supply? An isolated supply could be the form of a DC-DC converter. But they all will work with them, so this chip isn't anything out of the ordinary.
 
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