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TinySwitchIII power supply question

Discussion in 'Electronic Design' started by [email protected], Oct 23, 2007.

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  1. Guest

    Hi to all.
    I am looking to desigh a power supply , based largely on the Design
    Idea DI-117 from
    Power Integrations
    Link :

    The question I have is what is the reason for the big difference in
    value of L4 and L5. 1mH and 3.3uH respectively. The 2 inductors are
    there as a filter in conjunction with the resivour cap which has been
    split into 10u and 22u.
    The rest of the circuit is fairly strait forward , but I'm a little
    unsure about these inductors.

  2. Paul Mathews

    Paul Mathews Guest

    The larger inductor is non-ideal, so its parasitic capacitance will
    pass high frequency energy (primarily from rectifier switching).
    The smaller inductance should have very low parasitic capacitance and
    is intended to filter spikes remaining after earlier filter stage.
    Paul Mathews
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