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UCC28180 VREF脚上分压电阻最大能取多少?

Other Parts Discussed in Thread: UCC28180

UCC28180  VREF脚上分压电阻最大能取多少?因为待机功率问题,希望将此电阻取到2M以上,下电阻也同时调高,但测试时发现电压会漂高,求高手分析