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THS4521一上电就烧

Other Parts Discussed in Thread: INA240, THS4521, OP07

 

测试一个电流放大的电路,采样电阻输出接ina240,ina240输出接4521,电源电压从0V调到4.5V时,可以工作,测得的数据如下,

电流 ths4521输出
5 0.0931
10 0.193
15 0.2942
20 0.3944
25 0.495
30 0.595
35 0.6944
40 0.795
45 0.895
50 0.995
55 1.095
60 1.196

线性度很好,但如果DC源给4.5V直接开机,THS4521芯片烧,烧后测得THS4521的5pin和8pin之间的电阻只有3.3欧。

后怀疑是DC源启机有过充,但用示波器看5V的起机,未发现过充,有软启。