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UC3845: X843各系列開迴路duty差異

Part Number: UC3845

請問在VFB下地狀況下(開迴路),UC3845A系列的Duty是不是比UC3845D8TR還小?

實測UC3845AD8TR duty=40%, UC3845D8TR duty=43%

此兩系列以及UC384XB的差異為何? 謝謝!