Suggest BLDC Motor driver part no for UNIPOLAR configuration

Hi Vairavan,

Welcome to E2E thank you for asking a question! I am not very familiar with Unipolar configuration to drive BLDC motors. Just so that we are on the same page, When you mean Unipolar you mean you are going to driver the BLDC motor with 3 high side FETs connected to the motor phases and connect the center tap of the motor to GND rather than driving the motor with 3 H-bridges, is that correct?

Regards,

Michael W.

Vairavan,

It is easiest if you share a motor datasheet with us so that we can best suggest a solution.

Regards,

-Adam

Hello mike,

Thank you for your reply,

Pls find the BD of unipolar configuration,where top MOSFET is used for acceleration control and lower 3-MOSFETs are used for commutation based on Hall sensor feedback,

Hi Vairavan,

That is an interesting design, What voltage are you using for your supply? do you want a device to only drive the bottom three FETs?

Regards,

Michael

Hello mike,

Thanks for your reply,

we need a driver for both top and bottom mosfets.

Actually i have seen DRV8306 specification.but i think  it is designed only for bi polar configuration.

My requirements are ,

1) 3-Low side driver (commutation Logic shall be implemented based on hall sensor output)

2) 1-High side driver (Based on PWM input)

3) Forward and reverse direction Pin (commutation logic to be changed based on this input)

4) Brake or Deceleration Pin(As same like DRV8306)

Basically i need a driver as same like DRV8306 but it should  work for unipolar configuration.

Kindly provide your feedback asap.

Regards,

Vairavan P

Hi Vairavan,

I think you should look at the DRV8343-Q1 device and use the independent FET mode. this will give you VDS protection on all of your FETs. You are also going to need an MCU to take your hall sensor inputs and commutate the motor driver.

Also on your schematic that you are showing the inductors do not have recirculation paths meaning that you are going to blow up your FETs. I would suggest you put diodes in parallel to the inductors that is pointing up to fix this.

Regards,

Michael W.