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LM5022: sync clock with positive pulse width greater than 150ns

Marcos Lam
Prodigy 10 points
Part Number: LM5022

I an using an external clock generator to sync multple LM5022's.  The clock is 50% duty cycle and with positive pulse width greater than 15ns as described as max. pulse width for the sync signal.  The circuit seems to be working with this 50% duty cycle.  What is the reason for 150ns max pulse width and the implication of exceeding this limit?

thanks,

-Marcos

  • 0
    TI__Mastermind 21720 points
    Hi Marcos,

    The recommend pulse range on the RT/SYNC pin is 15ns to 150ns. The external clock can have a larger pulse width than this since the signal is AC coupled to the RT/SYNC pin. For the SYNC to work properly the RT/SYNC pin voltage must be above 3.8V.

    Thanks,

    Garrett
  • 0
    TI__Guru* 78300 points
    The IC reads the RT pin sourcing current to determine the clock as well as the slope compensation signal. Injecting a small pulse to the RT pin will only affect the pin condition briefly. A wider pulse may affect the clock operation as well as the internal slope compensation.