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Original question:

TPS65131-Q1: Output voltage unstability

PMP21683: Design parameters of transformer in power reference design of TI

user4856044
Prodigy 50 points
Other Parts Discussed in Thread: PMP21683

Hi,TI Engineer , a reference design of power supply, The digital number is:PMP21683, the transformer of circuit encountered problems. The BOM table of components mentioned the parameters of the transformer, T100, 250uH, RLTI-1303, Renco Electronics Transformer. There is no introduction about the parameters of transformer design in PDF of technical document's user guide. Now I need the design parameters of this transformer, such as frequency, winding turn ratio and number of windings, inductance 、current and voltage of primary and secondary sides, etc.

I need your help. Thank you.

  • 0
    Prodigy 50 points

    This is the page of reference power design. I need the design parameters of transformer. If you open this page, you will see the Yellow transformer. It's very eye-catching. You can't miss it.
    Best wishes

  • 0 in reply to user4856044
    Prodigy 50 points

    I need your help. Thank you.

  • 0 in reply to user4856044
    TI__Expert 4750 points

    Hi,

    Please see below parameters which I gave Renco for designing the transformer:

    • Input/output condition: 350VDC min to 410VDC max input to 48V/11A output.

    • Turns ratio: Npri : Naux: Nsec1 : Nsec2: Nsec3 = 29: 3: 7: 7: 2.

    • Npri current: 8Apeak, 3.5Arms.

    • Naux/Nsec3 current: less than 0.05Arms.

    • Nsec1/Nsec2 current: 31Apeak, 12Arms.

    • Transformer Primary Inductance: 250uH (with <5% leakage).

    • Nominal switching frequency: 60kHz to 150kHz.

    • Safety standard: reinforced isolation.

    • Maximum height: 38mm

    • Because of high AC current on this transformer, please use Litz wires on both end of the transformer.

    Please notice that the primary inductance in the latest version of RLTI-1303 is actually 230uH.

    Regards,

    Sheng-Yang Yu