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请教:TPS61070带负载能力太低问题

Other Parts Discussed in Thread: TPS61070

各位老师好,我在使用TPS61070将3V输入升至3.3V输出时,输出电压是对的,使用功率电阻作为负载测量其带负载能力时,最大只能输出150mA,继续减小负载电阻,输出3.3V就被拉低了,按照手册计算好像应该能够达到270mA的输出吧,不知道哪里不对,请指教,谢谢。附上电路图和150mA输出时SW波形。