LM5157EVM-FLY: The soft start time of LM5157 EVM-FLY

Rannie Zhou

Part Number: LM5157EVM-FLY
Other Parts Discussed in Thread: LM5157

Hi Stefan,

As the datasheet of LM5157, the SS time can be calculated in the formula.

The capacitor C_29 is 10nF and the calculated SS time is 1ms.

The blue curves is the output voltage. It seems that the SS time is 9.904ms.

Thanks for your help!

Best regards,

Rannie

0 Stefan Schauer over 2 years ago

Hi Rannie,

thanks for using E2E forum.

Can you please help to clarify: SEPIC - Flyback - which topology is used here.

Best regards,

Stefan

0 Rannie Zhou over 2 years ago in reply to Stefan Schauer

Hi Stefan,

The topology is flyback.

Best Regards,

Rannie

+1 Stefan Schauer over 2 years ago in reply to Rannie Zhou

Hi Rannie,

we just released an appliation report covering this topic.

Please have a look here:

Application note

Best regards,

Stefan

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