Duty cycle TMC246

[Vivio]

Hello,

The PWM duty cycle in case of 1/16 microstepping is 50%? What's the best way to get it?

All the best!

[TRINAMIC_BD]

There is no special dependence of the duty cycle from the microstepping. The duty cycle depends on current setting, motor resistance and supply voltage, mainly, as well as on the chopper mode (mixed decay is best for microstepping).

[Vivio]

Thank you for your reply

So is not that simple.

Can you have a look on the the stepper motor specs that I use.
The A figure represent a "chopper" driver with 100% duty cycle, the second one 25%. The specs are obtain with voltages eight times greater that motor rated voltage.

In my application I can go max to 12V with an 5v motor, although the motor is very snappy, the rating were closer to the A figure. I though there was a way to squeeze more juice from the motor.


All the best!

[TRINAMIC_BD]

With a const. current motor driver, like TMC246, the duty cycle automatically adjusts - but it might be, that they mean the fast decay portion, rather than duty cycle. With TMC246, it also automatically adjust in mixed decay mode.

[Vivio]

Thanks for clearing this out!