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TL431回授問題

Other Parts Discussed in Thread: TL431

請問TL431內部參考電壓2.5V為什麼是接在OP的"-"端?

設計回授時我們把補償電阻電容放在REF PIN和CATHODE PIN不就變成正回授嗎?

這樣還有補償的功用嗎?

謝謝