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