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opa454输入为何有电压

供电10V,200K电阻从电源到ED,其它都未接零件,我测试发现输入+,-端都有1.37V的电压,咋回事啊?这电压哪里来的?

Wen Jing:

因为运放的电源-Vs被悬空。

FRANK SHAW:

我接了电源的地,单电源供电

FRANK SHAW:

回复 FRANK SHAW:

有没有IC内部输入部分的电路图啊

FRANK SHAW:

回复 FRANK SHAW:

专家?不出声了,以前的回答太水了吧!!!!!!!!!

FRANK SHAW:

回复 FRANK SHAW:

不负责任,失望!!!!!!!!!!!!

Junqiang Shi:

回复 FRANK SHAW:

Hi Frank,

Thanks for your question.

For OPA454, the maximum E/D to E/D Com Voltage is 5V. It is NOT recommended to connect E/D to V+ through 200Kohms. Besides, it is NOT recommended to float amplifier input even if this amplifer is NOT used.

So please try to adjust your E/D voltage, and ground the input through pull-down resistor (if possible) to check if the circuit is ok? thanks.

Steven

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