No more than about 5khz. The PWM chip takes an input voltage between 0 and 1 volt, so the idea was to float the PWM IC so its rails ride up and down on top of the output voltage and divide the modulation input down from the output, referred to the floating "ground" so as not to lose resolution.
But the LT chip doesn't seem to cooperate with the idea.
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I'm not following what you mean. What's the definition of _common_ on the load side ...Jim Thompson
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