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adum3223 gives 900nS output with input of 100nS

Question asked by springburo on Feb 27, 2014
Latest reply on Jul 8, 2014 by RSchnell

in a totempole pfc we are seeing a strange effect with the adum3223 Driver.,  Although the circuit is normally working well, under certain pulse conditions the AD gives a 900nS Output pulse when the input is only 100nS Long.  This creates shoot through in our halfbridge circuit.

 

dv/dt is only about 20V/ns and we have seen the behavoius with even lower dv/dt, although at high dv/dt the circuit is working well.

 

Is this a Problem with the short pulse width, 

 

how can we avoid it?

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