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LM5026: 开环测试

Part Number: LM5026
Other Parts Discussed in Thread: LM5101

hi,我现在用的LM5026做开环测试,通过在Ref和COMP引脚之间串联一个可调电阻,来改变COMP引脚的电流,现在我的问题是,我测量到芯片输出的驱动波形一直在抖动(占空比在变化),不清楚是什么原因造成的,视频为输出波形