TMS570LS3137: TMS570 ADC problem

Hello Rita,

The noise may be caused by the motor control board. This noise should not be related to TMS570 ADC. 

Hello,

How can I figure this problem?

Thank you.

Hi Rita,

TMS570 or C2000 generates PWM for the motor control (switching the H-bridges). the output current of the load is precisely controlling by modulating the duty cycles of the PWM.

What happens if TMS570 generates same PWM as C2000 (period, and duty cycle)?

Hi Rita,

Have you done a test with the same PWM on TMS570?

I found that PWM_MODE setting on F28069+DRV8301 is 6 PWM inputs. (see Table 11)

But , PWM_MODE setting on TMS570+DRV8301 is 3 PWM inputs.

I use TMS570LS3137 control card, but there is no ePWM module compared to F28069.

How can I set pwm to make less noises?

How to change PWM dead band as EPWM module?

Hi Rita,

TMS570LS3137 doesn't have etPWM module. It generates PWM using N2HET code which resides and executes in N2HET RAM.

How can I remove PWM noise?

I use following algorithm.(Open loop FOC)

I use DRV8301 current circuit.You can see on first figure, A-phase current will be noisy.

I use external current circuit on DRV8301. As first  figure, B-phase current will be noisy.

How can I remove these noises?