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有关TPS40211-q1的问题

Other Parts Discussed in Thread: TPS40211-Q1

我用TPS40211-q1做升压电路,输出U,带负载R1时,输入电压U1芯片可以工作,但带负载R2(R2比R1小)时,输入电压要U2(U2比U1大)芯片才可以工作,有什么办法可以让负载是R2时,输入电压为U1芯片就能工作吗,电路图是Datasheet上的那个应用电路。