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LM5160-Q1: why Fly-Buck topoloy will not make the secondary Vout going up a lot at NO LOAD ?

Paul Kim
Intellectual 1430 points
Part Number: LM5160-Q1

Hi Team

just simple question.

for Fly-Back, if we mades the feedback loop from primary side, the secondary Vout would go up a lot at NO LOAD condition,

so that normally, we uses zener clamp for the secondary Vout.

BTW,, I heard Fly-Buck topology will not make the secondary Vout going up a lot even at NO LOAD.

may I know the detail reason ?

  • 0
    TI__Mastermind 40040 points

    Hello Paul.

    The output on the secondary does typically increase.  There is still leakage inductance and as a result a ringing occurs on the secondary that still peak charges the output capacitor and therefore a Zener or pre-load resistor is recommended in typical use cases.

    Hope this helps?

    Kind regards,

    David.