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UCC3817: Hold up time

Bharat Upadhye
Prodigy 80 points
Part Number: UCC3817

hello,

How to know the 1)  Hold-up time  (Output Capacitor design) for design of 1.5kW , 425V Vout. ? 

and in below mentioned formula Vout is 385 But how to know Vout(min) ?

www.ti.com/.../ucc3817.pdf

thank you

regards,

Bharat

  • 0
    TI__Genius 13660 points
    Hi Bharat,

    Holdup time and Vout(min) are the power parameters which are defined by yourself according to the application requirement.
    For example, Normal Vout is 385V, and determined minimal required output voltage Vout(min) is 340V, holdup time is the time that the output voltage drops from 385V to 340V after input ac voltage is removed.

    Regards,
    Teng