LMZM23601: loop questions of second-stage filter

user4811888

Part Number: LMZM23601

Hi TI expert,

Design a second-stage filter for sensitive applications - Power management - Technical articles - TI E2E support forums

I found this blog explaining how second-stage filter influences loop stability, however the aurthor did't mention where he puts FB pin, actually it is really important.

My question is, in this blog, which position is FB pin located? And, what is the difference between position 1 and 2 in loop gain?

over 1 year ago

0 Frank De Stasi over 1 year ago

TI__Guru 57555 points

Hello

Since the blog was referring to a module, I believe that the FB is taken at the output of the first filter.

I will try to contact the author and get more details.

Thanks

0 Frank De Stasi over 1 year ago in reply to Frank De Stasi

TI__Guru 57555 points

Hello

I am unable to contact the original engineer that worked on that blog.

However, I have attached some references that may be helpful.

Thanks

4861.measuring_output_noise.pdf 7838.understanding_measuring_and_reducing_outputnoise_0.pdf

0 user4811888 over 1 year ago in reply to Frank De Stasi

Intellectual 530 points

Thanks Frank, I will go through these

0 Denislav Petkov over 1 year ago in reply to user4811888

TI__Mastermind 18940 points

Hello,

Sounds good. Let us know if you have additional questions.

Regards,

Denislav

Power management

Power management forum

LMZM23601: loop questions of second-stage filter