DRV8412: Issue with resets when driving BLDC motor

haras nosregor

Part Number: DRV8412

Tool/software:

Hi,

In this thread, Rick is suggesting that not having individual control over each half bridge reset could cause a problem driving a BLDC motor with the DRV8412. Can TI please elaborate on the problem that this could cause?

Thanks

8 months ago

0 Keerthivasan Kumanan 8 months ago

TI__Genius 15685 points

Hi Haras,

Let me look into this and let you know.

Best,

Keerthi

+1 haras nosregor 8 months ago in reply to Keerthivasan Kumanan

Prodigy 90 points

I think I may have just found an answer to my own question in another forum post -- DRV8412 for stepper and BLDC. My understanding is that the DRV8412 cannot be used to drive a BLDC using trapezoidal control, because in order to produce the Hi-Z windows required for trapezoidal control, I would need a motor driver with resets for each individual half bridge. However, the DRV8412 can be used to drive a BLDC with field oriented control or sinusoidal control.

Can TI please confirm this? Thanks

+1 Keerthivasan Kumanan 8 months ago in reply to haras nosregor

TI__Genius 15685 points

Hi Haras,

You are correct. Trap control requires individual HI-Z control whilst DRv8412 doesn't offer that:

FOC should be possible with this driver, but we have dedicated BLDC drivers as well as sensor less FOC.

Best,

Keerthi

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DRV8412: Issue with resets when driving BLDC motor