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TPS55340: Soft-start capacitor calculation formula

Part Number: TPS55340

Tool/software:

Hi team, 

Is there a device-specific formula for calculating the SS capacitor value?

I see that the bias current is 6uA, threshold is 1.8V, and recommended capacitance is 0.047uF on the datasheet but no formula.

Thanks,

Yu

  • Hello Yu,

    The formula C*V = I*t gives you an estimate for the softstart time.

    But TPS55340 is clamping the duty cycle, not the output voltage, so the output voltage can rise a lot faster if there is no load at the output.

    Best regards,
    Brigitte