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LMZ35003: Soft-start time limit

Part Number: LMZ35003

Hi team,

The datasheet gives the Slow Start Capacitor Values and Slow Start Time on Table 8, I want to know if there is a limit for the soft-start time? If the soft-start time can be longer, for example 100ms?. Is there any equation to guide us to select the soft-start capacitor?

Thank you.

Best Regards

Chen Jiao

  • Hi Chen,

    Table 8 provides some common customer application that has been tested. I do think you can go higher than the 17msec soft start time. The equation for calculating the soft start capacitor is attached below:

    For this power module: Iss = 2.3uA and Vref = 0.6V. If you wanted to have tss = 100ms then you should choose a capacitor such that Css= 383nF. 

    Regards,

    Jimmy