how to connect the DRV8711 to test the current shape showing on oscilloscope？

user5791205

i using the testing pen to link the AISENP and BISENP (the postive link the AISENP,negative link the BISENP). the waveform is sinusoidal. and Is this connection correct ?

over 5 years ago

0 Wang5577 over 5 years ago

TI__Guru 56650 points

Hello,

Please check AISEN and BISENP waveform reference to the ground.

And then, visit https://www.mathway.com/Calculus to get the waveform shape. For example: f(x)=|sinx|-|cosx| waveform

0 user5791205 over 5 years ago in reply to Wang5577

Prodigy 90 points

if link the AISENP and ground (the postive link the AISENP,negative link the ground). the waveform is like this 。

0 user5791205 over 5 years ago in reply to user5791205

Prodigy 90 points

is This kind of a sine wave of current？

0 Wang5577 over 5 years ago in reply to user5791205

TI__Guru 56650 points

The AISENP to ground waveform is not sinusoidal waveform. To me, the current is below the indexer current setting. When the motor is spinning too fast or the input voltage too low, you may see that waveform.

So, please slow down the step rate and make the input voltage higher.

0 Wang5577 over 5 years ago in reply to Wang5577

TI__Guru 56650 points

Any update? I am going to close this post. You can re-open it by sending your input in this thread.

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how to connect the DRV8711 to test the current shape showing on oscilloscope？