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Original question:

TPS57160-Q1EVM: CISPR25 EMC Report

TPS57160-Q1EVM: TPS57160-Q1EVM

Yanni Li
Intellectual 1960 points
Part Number: TPS57160-Q1EVM

My customer has a questions about Slow-Start Time,on page 2 of the user's guide.

https://www.ti.com.cn/cn/lit/ug/slvua80/slvua80.pdf?ts=1596093498411&ref_url=https%253A%252F%252Fwww.ti.com.cn%252Fsitesearch%252Fcn%252Fdocs%252Funiversalsearch.tsp%253FsearchTerm%253DTPS57160EVM

Use Equation 2 to calculate the required value of C5 for a desired slow-start time.

Vref =0.8V, Iss=2uA, It says that C5 is set to 0.015 µF on the EVM for a default slow-start time of 7.82 ms.

But (7.82*10^-3*2*10^-6)/0.8*0.8 can't get 0.015 uf,he want to know what was wrong.