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Flyback/flybuck 2 isolated output + 1 non isolated 5V Vin 30Vdc

Antonio Faggio
Expert 7920 points
Other Parts Discussed in Thread: LM5160, LM5160A

Hi All,

I am looking for a flyback/flybuck with following specs:

Vin_max 30Vdc, 24Vdc_nom, 3 outpouts (1x non isolated, 2x isolated)

1x non iso: 5V_dc Pout_max 4.0W

2x out isolated: 5V_dc out 2.5W each

Which p/n can you recommend me?

Many Thanks,

Antonio

  • 0
    TI__Genius 12735 points

    Hi Antonio,

    I would suggest taking a look at PMP10532. I have forwarded your question to the team responsible for the part in that reference design, LM5160.

    Best regards,

    Layne J

  • 0 in reply to Layne J
    TI__Mastermind 22301 points

    Antonio,

    Like Layne suggested the LM5160 is the recommended converter.

    Id suggest a 1:1:1 transformer like the Coilcraft LPH8045.

    Please see AN-2292 for flybuck design guide.

    -Orlando

  • 0 in reply to Orlando Murray
    TI__Expert 7920 points

    Hi All,

    Thanks for the inputs. Please find below the exact specs:

    Input:

    (24Vin 19-30V_ full rangedc):

    Output:

    1)      5Vout 4W regultaed and non isolated for the entire board

    2)      MODBUS 5Vout 200mW

    3)      CANBUS 5Vout 200mW

    Do you think it is doable to do such power solution using LM5160A?

    Many Thanks,

    Antonio

  • 0 in reply to Antonio Faggio
    TI__Mastermind 22301 points

    Antonio,

    This is definitely possible with LM5160.

    I see one potential issue: the isolated voltage is calculated by

    Vout-iso = (N * Vout-pri)  - Vdiode.

    with N=1 to get 5V on the secondaries you would have to set the non-isolated output to ~5.4V (depending on diode drop).

    Thus the primary voltage will be slightly larger than the secondary if using a 1:1:1 transformer.

    Im not sure how feasable a 0.9:1:1 transformer would be.

    You could also insert a similar diode on the primary? 

    I can review your design before you build it.

    Hope this helps,

    -Orlando