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TPS563208电路调试遇到的问题。求解答!

Other Parts Discussed in Thread: TPS563208

这个是电路和pcb,调试过程中,有如下问题,VIN从5V逐渐升到12V,VOUT从4.8V逐渐升到5.8V。测试所用电源为线性稳压电源,TPS563208未加负载。分别测试了一些点如下:

1)VIN=6.63V,VOUT=5.28V,VBST=10.32V,VFB=0.792V,线性稳压器无电流输出;

2)VIN=7V,线性稳压器开始有电流产生,电流大小有0.01A,VOUT=5.38V,VBST=10.5V,VFB=0.8V;

3)VIN=9V,线性稳压电源电流显示0.02A,VOUT=5.51V,VBST=10.97V,VFB=0.822V。

请帮忙分析一下会是什么问题,谢谢!