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BQ25700A OTG 输出电压偏小问题

Dear:

   大家好,我在使用BQ25700模块的 OTG功能的时候发现OTG 输出电压比自己设置的偏小,例如设置了5v 实际输出4.2V左右,请问这大概是哪里的问题?

   谢谢!