DRV8834: DRV8834 drive unipolar and bipolar step motor

Jeff Chen71

Expert 1345 points

Part Number: DRV8834

Dears,

My customer want to use drv8834 to drive 2-phase bipolar and unipolar step motor.

Because they want use the same PCB at different appication.

I know DRV8834 can drive bipolar well. But I'm not sure if it can drive 5-lead unipolar step motor like below picture.

Thanks

Jeff Chen

over 8 years ago

0 Rick Duncan over 8 years ago

TI__Guru** 114905 points

Hi Jeff,

How does the customer plan to drive the unipolar motor ( indexer mode or phase/enable mode)?

Is there a schematic showing how the two motors will be driven?

0 Jeff Chen71 over 8 years ago in reply to Rick Duncan

Expert 1345 points

Hi Rick,

We want to use index mode. Attach file is my idea I think DRV8834 can realize the same magnetic field like step motor datasheet.

Thanks

Jeff Chen

DRV8834 .pptx

0 Rick Duncan over 8 years ago in reply to Jeff Chen71

TI__Guru** 114905 points

Hi Jeff,

Your idea should work. Assuming the motor is rated at 5V, it is recommended to set AVREF and BVREF at above Itrip. Setting Itrip above the motor current should allow the motor properly.

If current regulation is used, this could cause unexpected operation.

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DRV8834: DRV8834 drive unipolar and bipolar step motor