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PWM dimming input. Connect to PWM control signal. Output current is pulse-width modulated (PWM) dimmed from the maximum analog controlled level. Connect to VCC if not used.
这是原理图 ，上电空载电感L就会出现噪声，带上负载也会出现噪声，这个负载是30R的电磁阀，后面把PWM引脚的VCC断开然后拉低就没有噪声，我想知道这是啥情况
