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OPA2188

Henry Cheng1
Prodigy 180 points
Other Parts Discussed in Thread: OPA2188

So far, I found some issue about OPA2188, please help us to solve it.

 

Test power : +5V, -10V; use OPA2188 as voltage follower.

 

1 ,  When I add input voltage is from 4.3v to 5v on point A, the max output is 4.25v on point B, why it is not rail to rail?

 

2,  when I add input voltage is 3.6v on point A, the voltage of point B is about 3.8v. The output is always bigger than input. why it is not voltage follower?

 

  • 0
    TI__Genius 15410 points

    Hi Henry,

    The common mode voltage range of the device is V- to (V+)-1.5V (-10V to 3.5V in your circuit). Therefore having an input greater than 3.5V will be outside the specifications. If an input of 5V is needed, V+ will need to be supplied with at least 6.5V.

    Hope this helps!

    -Tim Claycomb