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UCC28950 Soft start capacitance

MG74275
Intellectual 290 points


1) What is the maximum capacitor value on the softstart/enable pin?

2) What is the internal discharge current?

  • 0
    TI__Intellectual 2230 points

    Hi,

    1) There is no maximum value limitation for soft start capacitor, it depends on specific application. The value of SS capacitor determines the soft start time, the duration when converter operates at cycle-by-cycle current limit and the hiccup mode off-time. 

    2) The internal discharge current(IDS) at SS pin is shown in the Figure 42 in the datasheet, it varies with different operation mode and duty cycle. The largest discharge current around 20 µA when the duty cycle is close to zero in cycle-by-cycle current limit. 

     

    Thanks

    Oliver