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LM2841输入电压24V,输出5V，电路：
空载时负载在5mA左右，但是需要周期性（大约2秒左右）点亮LED，LED输出20mA左右，发现只有一点亮LED，
输出电压被拉低100mA,LED关闭，输出电压回升，这是为何？
空载时SW波形：
LED点亮，输出20mA，SW波形：
