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LM2841使用不正常。

Other Parts Discussed in Thread: LM2841

LM2841在使用时,按照手册中的典型电路的接法,工作不正常。观测SW端波形,应该随着输入电压的提高,占空比逐渐降低,但实际上随着电压升高,SW波形逐步变差,到一定电压下,芯片工作电流突然上升到100多mA,SW波形变成类似正弦波振荡一样,电压完全失去了控制。

请问你们有没有碰到同样的问题,怎么解决?

NS的产品也算是TI的吧