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TPS43060升压34V 5A,电流不够(只有1A),不能带载

Other Parts Discussed in Thread: TPS43060

用TPS43060做一个输入19.2-27.6V输出34V 5A的升压电路,现在输出电压有34V,输出电流大于1A时电压下降很大(2A时电压为26V左右),请大神帮分析下,附件是我的设计电路图原理图webench_design_4321024_21_287025975.pdf