Electronics > Mechanical & Automation Engineering

Can I simply use two (one and a half) DRV8833s to drive a three-phase BLDC?

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CircuitBreaker:
The reason for asking is that I can find much cheaper two-phase ICs than three-phase ICs (e.g. DRV8833 vs TMC6300). So even disregarding the second bridge on a second 8833 would still be cheaper than using a single 6300.

Disclaimer: I only want to use the H-bridge part of the driver ICs; I will be using a self-made software driver + MCU to do the PWM controlling and positioning - so no HW speed-control needed of the driver ICs.

Alternatively, an even cheaper IC that only has three H-bridges is also fine, but couldn't find one - perhaps I used the wrong search terms.

Kjelt:
Just use standalone fets then if you are going to write your own software  :-//
That is how the commercial 3 phase drivers also do it. The ones I have seen opened use an TI 320 uC , small levelshifters to quickly drive 6 fets.
Also some protection against back-EMF during braking etc.
However it is not that easy to write the proper software, good luck.

thm_w:
DRV8833 $1.20
11V, 1.5A internal FET 2x

TMC6300 $3.30
11V, 2A internal FET 3x

Normally the TMC stuff has a lot higher markup, often justified with complicated features, although this does not have too many.

If you are looking for dirt cheap options I'm sure you can browse around on LCSC and find something https://www.lcsc.com/products/Motor-Drivers_611.html
Otherwise, how to TIs other options compare on price instead of looking at trinamic?

langwadt:

--- Quote from: thm_w on July 04, 2022, 10:14:41 pm ---DRV8833 $1.20
11V, 1.5A internal FET 2x

TMC6300 $3.30
11V, 2A internal FET 3x

Normally the TMC stuff has a lot higher markup, often justified with complicated features, although this does not have too many.

If you are looking for dirt cheap options I'm sure you can browse around on LCSC and find something https://www.lcsc.com/products/Motor-Drivers_611.html
Otherwise, how to TIs other options compare on price instead of looking at trinamic?

--- End quote ---

DRV8833 is two full bridges so 8 fets
TMC6300 is three half bridges so 6 fets

I don't see why the DRV8833 couldn't be used to drive a three-phase motor


thm_w:
Yeah 2 and 3 full bridges.
It can be used, but, like Kjelt says, OP may be misunderestimating the effort needed to implement this in software.

Hall or sensorless?
Volume of production?

Heres one for $1 that does everything, IF you have hall sensors https://www.lcsc.com/product-detail/Motor-Driver-ICs_Hangzhou-Ruimeng-Tech-MS8829_C231941.html

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