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TPS54260

Guru 13485 points

According to datasheet, soft start capacitor value should be lower than 0.47uF.

From terms of reducing inrush current I would like to use a 0.47uF capacitor (with 20% tolerance).

I would like to better understand the reason for the capacitor value limitation and also need to know whether the 0.47uF capacitor I would like to use is OK.

 

Design details are:

Vin = 32V-42V

Vout = 8.8V

Iout,max = 150mA

f =200KHz

L = 100uH

Working mode: discontinuous

Converter is used as an auxiliary supply in a controller board with several high power DC/DC converters.