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Current feedback circuit of DRV8312 and DRV8301-69M-Kit

Junji Takiguchi
Prodigy 250 points
Other Parts Discussed in Thread: DRV8301-69M-KIT, DRV8301, DRV8312

Good day.

 

Now I'm using below 2 evaluation boards for new model design.

DRV8301-69M-KIT

DRV8312-69M-KIT

In my understanding, function of phase voltage/current feedback circuits is same.

But in the case of current feedback circuit, I found that different type circuit is used.

 

I think purpose of this circuit is,

Pick up shunt resister voltage.

Apply Bias 1.65V.

Amplify 20times.

 

DRV8301 amplifier circuit is very simple, but in the case of DRV8312 is very complexity.

But final function looks completely same.

Is there any special reason to use different OP amp circuit?

 

J Takiguchi