Other Parts Discussed in Thread: LM5143
DEMB引脚通过一个4k7电阻接到VDDA,SC7模式控制信号为低,对地的电阻R10045未安装。万用表量到DEMB引脚的电位为高,约5V。理论上LM5143工作在强制PWM模式,即使轻载也处于连续模式。
但实际上轻载条件下 ,测到下管MOSFET上电压波形如右图,似乎进入了不连续模式。请帮忙看看是什么原因?
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