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LM5122工作异常

Other Parts Discussed in Thread: LM5122

当空载时,PWM HO、LO输出会周期性短暂的出现PWM,并伴随电感的一声啸叫,此时输入电压也会有一个向下的峰值,输出电压不稳定。

带载时,输入电压不再是恒定的电平,而是有规律的锯齿波,且只有当输入电压波形在低于某一值时,HO\LO引脚才会有PWM产生,否则不产生PWM,此时电感啸叫,输出电压是与输入电压方向相反的锯齿波。