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LM3481-Q1: LM3481 DR引脚波形不正常

Part Number: LM3481-Q1

12v输入,40v输出,电路如下

示波器测试DR引脚信号如下图所示,输出40v正常(空载与小功率带载信号类似)

1.请问DR的这种波形是否正常

2.不正常的话,是由电路哪个地方引起?