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TPS61020DRC 升压输出带负载输出异常

Other Parts Discussed in Thread: TPS61020, TPS61028, TPS61027

升压电路: 输入电压为2V---4V,输出电压4.2V

问题(输入电压为3.5V时):

1、先接通电源,再接负载(200mA),输出电压正常

2、先接上负载(200mA),然后再接通电源,输出电压才1.1V

电路原理图如下:

其中:L1的型号为CDRH5D28NP-6R8NC

            C21的型号为GRM21BR61A106KE19L

           C23的型号为C2012X5R1C225KT    

           C25的型号为TAJD476K016RNJ


PCB布线图如下:

做过很多次PCB板,都没有解决上面的问题,请高手指点!