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TPS54320 Synchronization Circuit

Other Parts Discussed in Thread: TPS54320

I am using the TPS54320 with both the RT resistor and an exteranl sync signal.  The external sync signal will not be present all of the time.  The TPS54320 needs to start up without the external sync signal using the RT resistor.  Is there an example circuit availabe that shows how to couple the sync signal into the RT/CLK pin without loading the RT resistor?