drv8412 current & decay control

Cor

Other Parts Discussed in Thread: DRV8412

Hello,

I want to use the DRV8412 with a 48V 3 A stepper. I want to control the current for ever step and also apply mixed decay. Does anyone know how to do this.

regards,

Cor

over 15 years ago

0 Kim Nordtorp Madsen over 15 years ago

TI__Expert 4320 points

Cor

the DRV8412 is a power driver only - there is no controll build in. You need to do current measurement and regulation external, either with a analog controller or a controller based on a DSP or MCU

if you go to: http://focus.ti.com/general/docs/gencontent.tsp?contentId=67209&DCMP=MotorControlTools&HQS=NotApplicable+OT+motorcontrol

and then select the "stepper" in the left selection, you should get some links to solution based on either C2000 dsp, Cortex MCU or MSP430 MCU.

rgds,

Kim Nordtorp Madsen

0 Cor over 15 years ago in reply to Kim Nordtorp Madsen

Intellectual 375 points

Thank you Kim,

I have looked into the solution. I think it might work but I have some concerns. I want to control 3 steppers up to 64kHz micro stepping frequency. If I want to control the current I think I have to sample the current values with at least 20 times the step frequency. This results in 1.28MHz! An interrupt should stop the bridge from conducting at this rate. Do you think this is possible? And how could I implement mixed decay control?

Regards,

Cor

0 Kim Nordtorp Madsen over 15 years ago in reply to Cor

TI__Expert 4320 points

Cor

For questions on the control I have to refer you to the microcontrol, C2000 forum, look at: http://e2e.ti.com/support/microcontrollers/tms320c2000_32-bit_real-time_mcus/f/171.aspx

Kim

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drv8412 current & decay control