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TPS92692-Q1: 电路板PWM波形问题

Part Number: TPS92692-Q1

按照规格书9.2.1 Typical Boost LED Driver 搭的测试电路,12V输入,功率18W左右应该是对的,芯片GATE引脚波形如下,不是一个连续的调制波形,请问是正确的吗