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TPS54116-Q1: Overcurrent limit at soft start

Part Number: TPS54116-Q1


I have a question about the LM541161-Q1.

What is the current limit value during the soft start period?

The current limit at Hiside appears to rise with the rise. (WEBENCH result)

Is there a calculation method?

Thank you.

  • Masazumi-san,

    TPS54116 is a peak current mode controller. 

    According to the information on datasheet section 7.3.11, the part use COMP pin voltage to turn off the high-side FET. When peak siwth current intersect the COMP voltage, the high side switch is turned off. 

    During soft start, the COMP voltage rises up, that's why high-side current appears to rise.