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UCC28750: Applications UCC28750

Bastien Bertrand
Prodigy 165 points
Part Number: UCC28750
Other Parts Discussed in Thread: LM5155

Tool/software:

Hello TI,

I would like to know what is the typical application of the UCC28750? Please do.

This component can be interesting for different typical applications like:

  • 400VDC/115VDC -> 28VDC
  • 28VDC -> 28VDC/24VDC/15VDC/12VDC
  • 18VDC/36VDC -> 28VDC/12VDC

If you have another component that I could use for these applications, please let me know.

Yours sincerely

  • 0
    TI__Genius 12765 points

    You can use this for any low power SMPS. It has UVLO on threshold of 16V so you can use it for all the applications you listed above depending on the output power.

    We need more system requirement to narrow the component selection.

  • 0 in reply to Ning Tan
    Prodigy 165 points

    Hello,

    Here are the details of my need:

    For the use of this chip, it is to realize “flyback” type power supplies with a power between 1W and 150W.

    Switching frequency around 100kHz - 200 kHz.

    Use of inputs already mentioned above, but I'm going to re-state them:

    Input voltage: 18V, 28V, 36V, 115V, 400V (Optionally 800V).

    Output voltage: 28V, 15V, 12V.

    Output currents will depend on the power required, but will never exceed 5A.

    If it's possible, in addition to the UCC28750, to have a regulation solution on the primary, that would be a plus. If possible, modifying the switching frequency would also be a plus.

    No flyback-derived topology such as active clamp or quasi-resonant. It's best to stick with a classic topology.

    Thank you and have a nice day,

    Yours faithfully,

  • 0 in reply to Bastien Bertrand
    TI__Genius 12765 points

    Let me clarify three things

    1) you want primary side regulated solution, in another word, no opto-coupler type of feedback from the secondary side, right?

    2) you want to have the option (like an external pin) to set the switching frequency between 100kHz and 200kHz, right? Is it freq clamp or fixed freq?

    3) the operating freq should be fixed for most of the load conditions or ALL load conditions?

  • 0 in reply to Ning Tan
    Prodigy 165 points

    Hello Ning,

    I answer at your question :

    1) Yes, exactly.

    2) Yes, 100 kHz or 200 kHz. It depend the case of application.

    3) I don't know for the moment, the objective is to find a component for this case of application.

    For my part, i have seen the LM5155 for the low voltage application and the UCC28750 for higher.

  • +1 in reply to Bastien Bertrand
    TI__Genius 12765 points

    UCC28750 is a secondary side regulated controller so it needs an opto-coupler. 

    You can use our general purpose PWM like UCC28C4x family for fixed frequency and PSR support.