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TPS61022问题

Other Parts Discussed in Thread: TPS61022

使用TPS61022做升压,输入是2节AA电池,大约是2.8V,输出是5.5V。加上负载后(不到200mA),发现电压会下降到5V,甚至更低。尝试增大输入电容和输出电容都不行。看芯片手册输出电流足够大,为什么会出现这种情况?请赐教,谢谢。