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UCC28742: AC - DC Power Supply part selection

Basit Ali Khan
Intellectual 370 points
Part Number: UCC28742UCC256402
Other Parts Discussed in Thread: UCC28950, UCC28251, UCC2894, UCC256402, UCC25640EVM-020, UCC25640

Tool/software:

Hi,

I am designing a Power supply having following parameters:

  • Input Voltage: 85VAC - 265VAC
  • Input Frequency: 50Hz - 60Hz
  • Output Voltage: 12V DC
  • Output Current: 25A
  • Protection: input under-voltage protection, input over-voltage protection, input surge protection, output over-voltage protection, output over-current protection

Need to find a suitable part for it.

  • 0
    TI__Guru 74115 points

    Hi,

    The Pout = 300W. I suggest you use UCC28950 phase shifted full bridge. Flyback does not seem a good candidate for such a high power. 

  • 0 in reply to Hong Huang
    Intellectual 370 points

    Thanks. Any other part number if I reduce Pout = 200W i.e. 12V 16A. 

  • +1 in reply to Basit Ali Khan
    TI__Guru 74115 points

    Hi,

    200W still too large for flyback. UCC28950 can still be used or UCC28251 for half bridge.

    Flyback usually is to be used 120W or less.

    Forward is roughly ok for 200W then UCC2894 can be considered if you do not want use half bridge or full bridge.

    I see UCC256402 for LLC which is ok to use for 200W but it is better to have narrow input which is not your case.

  • 0 in reply to Hong Huang
    Intellectual 370 points

    In the UCC25640EVM-020 evaluation board schematics I dont see any link between the VIN (2? marked) and the AC input point (1? marked) so are they both connected or this is something else and both AC and DC inputs are separately applied.


  • 0 in reply to Basit Ali Khan
    TI__Guru 74115 points

    Hi ,

    AC DC needs a rectifier circuit. Please open a new thread with UCC25640 to get better support and get your questions answered by the dedicated experts on that device.