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TPS43060: DC gain in the datasheet

Saurabh Tewari
Intellectual 670 points
Part Number: TPS43060

Hi, my question is about the DC gain expression in the datasheet, specifically equation 37 in Section 9.2.1.2.13 Control Loop Compensation -- It is unclear where the multiplier 3/40 comes from. Whereas the G_EA value in Section 7.5 Electrical Characteristics on pg.5 of the datasheet is 1.1m/Ohm. The compensator R, C are different depending upon what number I use. It would be great if someone from this team could help me out.

Thanks!

PS: In the same section 9.2.1.2.13, I think that the modulator pole should be at (approximately) twice the frequency (Table 12.4, Erickson & Maksimovic, 2e).

  • 0
    TI__Mastermind 21720 points

    Hi Saurabh,

    Thanks for reaching out with your question and for considering the TPS43060 for your design.

    The 3/40 term is a set value. This is comes from the COMP to PWM comparator gain divided by the current sense amplifier gain. This is constant for any design as they are set values.

    GEA is the trans-conductance of the error amplifier as stated in the datasheet.

    Please let me know if you have any questions.

    Thanks,

    Garrett

  • 0 in reply to Garrett Roecker
    Intellectual 670 points

    Thank you Garrett. I am waiting to mark this resolved while I test the recalculated value of the compensator components. I will reply with the results.