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TPS61165 电压输出问题

Other Parts Discussed in Thread: TPS61165

用tps61165输出给7寸LCD做背光电压,输出最高只能达到8.7v,此时ctrl端已经输入3.3的高电平。反馈电阻的两端电压也不到100mv,并且有纹波很严重。

电路用的手册中的标准电路,后来试过电容改成4.7uF,或者减小电阻,仍是这样。