DRV8313: Driving Waveform

Hirokazu Takahashi

Part Number: DRV8313

Dear Support team,

The following waveform is an observation of the driving waveform of DRV8313.
Is the protrusion waveform in the red circle part a counter electromotive voltage?
Is the voltage drop in the blue circle part a drop due to the on resistance of the Hiside FET?
The motor current is about 400m to 500mA.

Best Regards,
Hirokazu Takahashi

over 4 years ago

0 Adam Sidelsky over 4 years ago

TI__Guru 61310 points

Takahashi-San,

Thanks for posting on the MD forum!

Could you please identify the different trace signals for us? Which signals are shown in green, yellow, and pink?

Regards,

-Adam

0 Hirokazu Takahashi over 4 years ago in reply to Adam Sidelsky

TI__Expert 8420 points

Hello Adam-san

Thanks for reaching out.

CH1(Yellow)：OUT3
CH2(Green)：OUT2
CH3(Pink)：OUT1

Best Regards,
Hiroakzu Takahashi

0 Adam Sidelsky over 4 years ago in reply to Hirokazu Takahashi

TI__Guru 61310 points

Takahashi-San,

I am not following why All three OUT1/2/3 are HIGH at the same time, could you explain the method of commutation?

Regards,

-Adam

0 Adam Sidelsky over 4 years ago in reply to Adam Sidelsky

TI__Guru 61310 points

Takahashi-San,

I have seen no update on this thread, did your issue get resolved?

I will mark this thread as closed for now but please post again if you need further assistance.

Regards,

-Adam

0 Hirokazu Takahashi over 4 years ago in reply to Adam Sidelsky

TI__Expert 8420 points

Hello Adam-san

The time scale is 2us/div. So the waveform shows short time switching phenomenon. Is the waveform not normal?

Best Regards,
Hirokazu Takahashi

0 Adam Sidelsky over 4 years ago in reply to Hirokazu Takahashi

TI__Guru 61310 points

Takahashi-San,

I would say this waveform is unusual, with a brushless motor, you generally want at least one of the phases low so that you can drive current into the motor.

Regards,

-Adam

0 Adam Sidelsky over 4 years ago in reply to Adam Sidelsky

TI__Guru 61310 points

Takahashi-San,

I have seen no update on this thread, did your issue get resolved?

I will mark this thread as closed for now but please post again if you need further assistance.

Regards,

-Adam

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DRV8313: Driving Waveform