Alternative to Allegro part number A3938

Douglas Dione

Other Parts Discussed in Thread: DRV8306, MCT8316A

Would you be able to recommend a best-fit alternative to Allegro part number A3938? We are using the REF input on the A3938 to control the motor, versus the PWM input. So that method/feature of setting the load current would be essential to minimize software impact.

I evaluated the DRV8306 but it does not have that current control feature.

over 3 years ago

0 Aaron Barrera over 3 years ago

TI__Mastermind 26046 points

Hi Douglas,

You're right, DRV8306 has PWM input rather than REF input so it is not exactly the same.

Can you share maximum motor current and voltage of the application? If it is less than 8A peak current and 24V maximum, they may use MCT8316A which is an integrated MOSFET solution capable of 8-A peak and 40-V abs max and accepts an analog speed input.

Thanks,
Aaron

0 Douglas Dione over 3 years ago in reply to Aaron Barrera

Prodigy 10 points

Thank you Aaron but that is far too advanced and has more functionality than necessary.

0 Isaac Lara over 3 years ago in reply to Douglas Dione

TI__Mastermind 23045 points

Hello Douglas,

If you can share some of your motors specs we might be able to make a better recommendation:

Motor Voltage

Peak current

Sensored or sensorless motor

Trapezoidal or Sinusoidal control

These should allow us to make a better product recommendation if there is one. Thank you!

Best,

Isaac

Motor drivers

Motor drivers forum

Alternative to Allegro part number A3938