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LM5121: Equation # 45 in data sheet for calculating Rcomp is wrong

Li Chen92
Expert 3040 points
Part Number: LM5121

Hi TI expert

I think Equation # 45 in data sheet for calculating Rcomp is wrong.

Please see attachment.

  • 0
    TI__Guru* 78100 points

    Hi Li,

    I just verified in Mathcad that the datasheet info is basically correct: the result is ~196kOhm.   Note that Vin uses the typical Vin of 9V.  It also clearly mentions in the paragraph below Equation (44) that fCROSS is chosen to be 13.4kHz, not 25kHz.

    Thanks,

    Youhao Xi, Applications Engineering