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LMZM23601: loop questions of second-stage filter

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?