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UCC28740: Couldn't get 3A output current

Johnson Cheah
Intellectual 1300 points
Part Number: UCC28740
Other Parts Discussed in Thread: PMP20533

Hi Team,

Currently I had suggested customer to use this calculator sheet file for their SMPS design by using UCC28740 and R&D engineer made the selection of transformers from the selection sheet base on output is 15V@3A and they could only achieve output current at 100 mA max.

 

Can you check as they actually refers the reference design but the reference design.

Please refer to PMP20533 links below:

Product Folder: http://www.ti.com/tool/PMP20533

Schematic: http://www.ti.com/lit/pdf/tidrpt6

Test Report: http://www.ti.com/lit/pdf/tiducw9

SMPS_Schematic.pdf

  • 0
    TI__Guru* 75615 points

    Hello Johnson,

    The reference design looks like it matches there power level exactly.  Do you know if they used the Renco transformer RLTI-1178

    The excel design tool for the UCC28740 should have given them the correct calculations for the transformer and feedback components. http://www.ti.com/lit/zip/sluc487

    What are the customers input power requirements? Could you send a schematic and any waveforms they may have taken? If they used the design tool could you send it to us with their inputs?

    Regards,

    Mike

  • 0 in reply to Mike O'
    TI__Guru* 75615 points
    Please note that issue is being resolved by an applications engineer and is closed on the e2e.