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TLV1117-ADJ 输出电压问题

Dear,

我的应用是:Vin = 5V,Vout = 2.8V ,Iout = 500mA,采用TLV1117-ADJ进行简单实验测试。

电路原理图:通过计算,R1、R2电阻值都取3.9K,为了便于测试,Cin、Cout与Cadj都没有用。整个电路只有TLV1117-ADJ芯片、R1和R2存在。

测试现象:通过测试发现Vout电压输出不是计算值2.8V,而是4.2V,并且随着Vin的增大,Vout也会增大,并且始终压差保持在0.8V(是在空载下的现象)。请帮忙分析下现象,多谢~