High resolution digital diode emulator for DC-DC converters

   
   

A digital diode emulator (DDE) for a DC-DC converter increments a digital counter with a high frequency clock. For each inductor current cycle, the counter counts between turn-on and turn-off of the output switching circuit's lower switch. When the contents of the counter match a modification of a count latched from the previous inductor current cycle, a turn-off signal is supplied to the control logic. If the previous inductor current cycle's turn-off signal occurred late, the latched count is decremented by one bit. If the previous cycle's turn-off signal occurs early, the latched count is incremented by one bit. Over successive inductor current cycles, the digital diode emulator effectively `dithers` the turn-off time of the switching circuit's lower switch about the zero-crossing point of the inductor current.

 
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