DRV8307: Drive waveform

Annie Liu

Part Number: DRV8307
Other Parts Discussed in Thread: DRV8306

Hi Team,

An alarm signal will appear when the DC brushless motor is running (the alarm signal is a cycle of 5V level signal, high 7ms and low 5ms). The V-phase lower bridge has a better driving waveform (a cycle is high level 5ms, low level 7ms). The driving waveforms of the other channels are not good and are a bit missing. The Hall signal is good. The above is the phenomenon of the motor running.

If the motor is not connected, and the external Hall signal is given, the driver will not alarm. Only the low end has a better drive waveform, and the high end has no drive waveform. Customer would like to know why? Is it related to drive resistance and sampling resistance?

The normal driving waveform should be a better PWM waveform. Why is there a problem with the PWM waveform? The motor has a small vibration and starts to run. The customer's understanding is that the six-channel drive waveform should be better. What should the normal pwm waveform look like?

Thanks,

Annie

over 4 years ago

0 Matt Hein over 4 years ago

TI__Mastermind 21805 points

Hi Annie,

Is this the same question as: https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1015519/drv8307-drv8307-faultn-active-analyze?tisearch=e2e-sitesearch&keymatch=DRV8307#

Or is it a different thread?

Thanks,

Matt

0 Annie Liu over 4 years ago in reply to Matt Hein

TI__Genius 10295 points

HI Matt,

That is the previous question. and it has been solved. Now, he would like to know what kind of driving waveform the motor is running, high-end and low-end.

Thanks,

Annie

0 Aaron Barrera over 4 years ago in reply to Annie Liu

TI__Mastermind 26046 points

Hi Annie,

The driving waveform for DRV8307 can be found here in the datasheet:

The device accepts a PWM input signal to drive the 3 half bridge gate high and gate low outputs (xHSG and xLSG, x = U,V,W). Digital or analog hall signals from the motor are fed back into the DRV8307 to commutate the motor using synchronous rectified PWM signals.

This device is similar to the DRV8306, except it does not include Smart Gate Drive technology. Rather, it has internal analog dead time generator and gate drive logic.

Is this what is needed?

Thanks,
Aaron

0 Matt Hein over 4 years ago in reply to Aaron Barrera

TI__Mastermind 21805 points

Hi Annie,

Do you need any further assistance on this thread?

Thanks,

Matt

0 Matt Hein over 4 years ago in reply to Matt Hein

TI__Mastermind 21805 points

Hi Annie,

I'll close this thread. If you have further questions please click the "Ask a related question" button!

Thanks,

Matt

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DRV8307: Drive waveform