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SN6501 in flyback topology

Aaron Jones
Intellectual 760 points
Other Parts Discussed in Thread: SN6501

Hi team,

Would it be possible to use the SN6501 in a flyback topology?

Per datasheet, it uses push-pull topology--can it be modified by using only D1?

I expect that it's possible but we can't guarantee the performance as listed on the datasheet--is this true?

Regards,

Aaron Jones

  • 0
    TI__Guru 55795 points
    Hi Aaron,

    Flyback ideally is a closed loop topology that heavily relies on feedback for regulating output whereas SN6501 is an open-loop easy to use push-pull convertor. The other major difference is that Flyback requires variable duty cycle (between 0% to 50% in discontinuous mode) for its operation and SN6501 has a fixed duty cycle of 50%. Hence it is not possible to use SN6501 as a true Flyback convertor.

    If you still want to use SN6501 for Flyback operation for a well regulated input supply, you still can do it by adding relevant external components and using only one of D1 or D2 MOSFETs but this wouldn't be the best way to implement Flyback. Choose a turns ratio such that 50% duty cycle of SN6501 is providing required output voltage. Please also note that there are no protections like Over Current Protection in SN6501 unlike other Flyback convertors.