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UCC28221 Transformer design

mahesh jalgaonkar
Prodigy 170 points
Other Parts Discussed in Thread: UCC28220

Hello sir,

I need to design 5V/120A SMPS. I have hands on experience in forward converter. 

I Have restriction on heights so I decided to go for dual PWM converter.

My thinking was if I go for dual PWM then my magnetic s will be half SO one transformer will give 60A and another will give 60A.

But from datasheet I am confuse whether it will happen or both of my transformer will have to give 120A. And it will give me only ripple current less with less output capacitor is that the only benefit for this chip.

Please suggest.

  • 0
    TI__Genius 9130 points
    Mahesh,

    The UCC28220/1 are dual output PWM controllers. I.e. they drive 2 independent power stages, and drive them out of phase to get the benefits or ripple current cancellation at the input. But each power stage can be rated for half the total power (maybe slightly more to account for imbalance between them).

    A single feedback of the output voltage to the controller will set the same peak current level of each stage, and the sharing of the power between them will depend on the accuracy & matching of the power stage (inductance, Rcs, etc).

    The EVM is probably a useful reference, this implements dual interleaved forward converters for 12 V output @ 16.67 A (~ 8-9 A per stage).

    The EVM can be ordered from the TI website:

    www.ti.com/.../ucc28221evm


    Thanks,
    Bernard