Hi,
What is the voltage applied to the SS pin of this device?
In the reference schematic of the EVB datasheet, a capacitor with a 25V voltage rating is used. I am wondering if there is a specific reason for selecting a 25V-rated capacitor
Hi @sh_im ,
Apologies for the late reply; MPS had a company shutdown for the holidays. The SS (soft-start) pin has an absolute max rating of 5.5V, but you do not directly apply voltage to the SS pin. A capacitor (Css) is connected from SS to GND, and an internal 13uA current source charges Css at start-up. The voltage seen at SS pin is the voltage of Css.
SS, FB, and EA block:
More info on SS from datasheet:
Thanks,
Rubas
Hi, Rubas,
Thank you for your response.
I have an additional question: could you please explain why a capacitor with a 25V voltage rating is used?
Is it because the SS pin has an absolute maximum rating of 5.5V?