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LM3481 同步後duty,max 問題

Other Parts Discussed in Thread: LM3481

我使用LM3481,syn對地裝200K 歐姆,

單純測試IC duty, max約86%,

額外加了一個方波150KHz, 3V的同步訊號給syn腳

但 duty, max下降為79%,

請問什麼原因導致同步後duty, max下降?

謝謝

Burgess