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DRV8262: Output Current Low & what is the capability

Part Number: DRV8262

Tool/software:

Hello!

I have a DRV8262VEVM that was recommended to me for my load. The load varies quite a bit, from 3A to around 20A...

I have setup everything to communicate with the EVM and have the EVM connected to a small motor, everything working great! I can control the speed, ramp, brake, and everything....

But it cannot handle my 3A motor... I have the motor on a small gearbox freewheeling and directly from the power supply, the motor draws 3A max...

When I try to enable it with the EVM, it jerks slightly then just stops. The current on the GUI monitor shows 2.6A, but the motor doesn't spin...

There is no fault or error message of any kind...

Is there a physical current limit somewhere that would be set at 3A?

I thought this EVM is supposed to be capable of like 32A in parallel mode with the big heatsink...

  • Hi Luke,

    Thank you for your post. The VREF1 and VREF2 for each H-Bridge will set the current limit. For maximum current output you should set this to 3.3 V. 

    The RIPROPI in the EVM is 3.3 kΩ. So with 3.3 V VREF the current will be limited to about 4.7 A. To disable current regulation you can short the corresponding IPROPI to GND in the EVM. This will allow the full peak current drive.

    I thought this EVM is supposed to be capable of like 32A in parallel mode with the big heatsink...

    Note, this will be the peak current the DDV device can support for short durations not continuous current.

    Regards, Murugavel