LM25116: Step by step guide for stability

HS FAE Germany

Part Number: LM25116

Hello,
do we have any app note / step by step guide for compensation? Customer uses an LM25116 and has some problems with subharmonics.

Regards, Holger

over 7 years ago

0 Arief Hernadi over 7 years ago

TI__Mastermind 23845 points

Hi,

We do have some quick start calculator that you can download and you can compared your design with the calculator
www.ti.com/.../lm5116-5116wg-25116design-calc

Thanks
-Arief

0 HS FAE Germany over 7 years ago in reply to Arief Hernadi

TI__Mastermind 32220 points

Hello Arief,
the customer has an additional LC filter, so that the excel sheet can't be used for the compensation.

Regards, Holger

0 David Baba over 7 years ago in reply to HS FAE Germany

TI__Mastermind 40040 points

Hello Holger,

I am assuming you are referring to an output filter. It is not recommended to place the Double pole of the filter inside the loop BW of the feedback control, if you do, the system will be very difficult to compensate.. Please follow the guidelines given in the presentation attached. By doing so, you can ignore the LC filter at the output.

Hope this helps?

Output Filter design rev 2.ppt

David.

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LM25116: Step by step guide for stability