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LM5119Q: Minimum duty cycle - LM5119

Carlos Silva85
Expert 4915 points
Part Number: LM5119Q
Other Parts Discussed in Thread: LM5119

I can't find, in the LM5119 Datasheet, a reference to the minimum achievable duty cycle.

The minimum on-time is specified as 100nS, so naturally I could calculate duty based on my switching frequency, but I want to check whenever this equation is valid.

Equally, I would like to check what happens if the device can't keep up with regulation at very low duty cycle levels. Will it go into pulse skipping?

  • 0
    TI__Mastermind 24075 points
    Hi Carlos,

    The minimum on-time can be used to calculate minimum duty cycle. As the datasheet only provides typical 100ns value, I would suggest to leave sufficiency margin (like 200ns) during your design.

    If the required pulse is narrow than minimum on pulse, pulse skipping will happen, large output or low frequency oscillation may occur on output.

    Thanks
    Qian