TMS320F280049C: HRPWM module, there will be 1clk jitter in B-channel output

Green Deng

Part Number: TMS320F280049C

Dear team:

One of my customer want to generate a complementary HRPWM with deadband.

In the final output, the frequency and duty cycle of HRPWMA are very stable. However, the waveform of HRPWMB will have 1clk jitter (delay or lead) at the falling edge. Below is his code:

What could cause this problem?

Best Regards

over 5 years ago

0 Nima Eskandari over 5 years ago

TI__Guru 52020 points

You are using HIRESOLUTION PWM, HIRESOLUTION DEADBAND together on both edges in active high complimentary mode?

0 Green Deng over 5 years ago in reply to Nima Eskandari

TI__Expert 4490 points

Hi Nima:

He needs to use high precision period, so the two edges are set with HIRESOLUTION PWM control. MEP controls both rising and falling edge

At the same time, turn on HIRESOLUTION DEADBAND and set the Falling and Rising edge delays control. But when he turn HIRESOLUTION DEADBAND off, the 1clk jitter of EPWMB still exists.

Best Regards

0 Nima Eskandari over 5 years ago in reply to Green Deng

TI__Guru 52020 points

Can you send me a minimal c code I can test?

0 Nima Eskandari over 5 years ago in reply to Nima Eskandari

TI__Guru 52020 points

I looked through your ePWM and HRPWM code you have posted and all seems good. If you can send me small main() code to test out on my device, I can check to see what is causing the issue.

0 Green Deng over 5 years ago in reply to Nima Eskandari

TI__Expert 4490 points

Hi Nima:

My client seems to have solved the problem in other ways. Thank you for your continued attention.

Best Regards

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TMS320F280049C: HRPWM module, there will be 1clk jitter in B-channel output