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UCC28700: Selection of reference design constants

Kaji@PAN
Mastermind 7795 points
Part Number: UCC28700
Other Parts Discussed in Thread: PMP10739, UCC28722

Hi,

I previously asked a question about UCC28700 devices in the following thread.
I am considering using the configuration of the PMP10739 reference design with the following specifications.
However, I do not know how to select circuit constants in this configuration.
Is there any reference material to determine any circuit constants?
In particular, I would like to know how to select the constants of the inductor and input / output capacitor in the buck configuration.

(specification)
VIN: 140V
VOUT: 24V
IOUT: 1.5A
Best regards,
e2e.ti.com/.../871117
  • 0
    TI__Expert 8210 points

    Kaji

    We have the following app note http://www.ti.com/lit/an/slua721a/slua721a.pdf that describes the design procediure with UCC28722 configured as a buck, which is very similar to UCC28700 so the techniques used to design the power stage are the same.  The only major difference is that UCC28722 works with a power BJT instead of a FET.

    If you have Mathcad we also have the following design calculator that you can use to help with your design.

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/7875.UCC287xx-for-Buck.mcdx

    Best Regards,

    Eric