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UCC28951-Q1: formula for calculation of power transformer loss

Rajashekar Koutla
Intellectual 590 points
Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC28950

hello sir

In the design datasheet of DC DC converter 600W 12V using UCC28950 , the calculation of power transformer loss is getting wrong.when I substitute DCRp and DCRs in the equation 51 of page no 42 which you have mentioned their, that is not matching what you have calculated for transformer loss.(~7W) .. Is there any printing mistake or did i calculate wrong ? please clarify me regarding this.

6175.ucc28950.pdf

  • 0
    TI__Mastermind 25570 points
    Hello Rajashekar

    Unfortunately there is an error in the data sheet value for the secondary DCR (eq50.) The resistance should be 0.58mOhms not 580mOhms. If you substitute in the corrected value you will get 7W as the answer.

    Please note that the loss calculations for the transformer are estimates.

    Regards
    Colin