AM4378: PWM signal issue when CMPB is equal to PWM period

Shine

Part Number: AM4378

Hello,

Customer used ARM4378 to generate PWM pulse. When setting CMPB (e.g 31250）equal to PWM period (e.g 31250), there is a pulse which width is equal to PWM period.

Compare registers are set as follows:

PWMSS_EPWM_AQCTLB_CBD= 0x2;------AQ_SET;

PWMSS_EPWM_AQCTLB_CBU = 0x1;------AQ_CLEAR;

LOADBMODE = 0x2;--------CTR_ZERO_PRD;

PWMSS_EPWM_AQCTLA_CAD = 0x2；

PWMSS_EPWM_AQCTLA_CAU = 0x1；

PWMSS_EPWM_AQCTLB_CBD = 0x2；

PWMSS_EPWM_AQCTLB_CBU = 0x1；

Thanks.
Rgds
Shine

over 3 years ago

0 Fleenor over 3 years ago

TI__Genius 15552 points

Hello,

Can you give more description on the issue the customer is facing?

I realize that they have the PWM module Configured for their use case, but what is the error that happens?

Regards,

0 Fleenor over 3 years ago

TI__Genius 15552 points

Hey Shine,

Can you give any more clarification? Is the erroneous pulse width always equal to period value set in the CMPB? What are the Yellow and Green signals from scope shot representing?

0 Shine over 3 years ago in reply to Fleenor

TI__Genius 13655 points

Hi Zackary Fleenor,

Thanks for your support.

I'll ask the customer to clarify his problem more detailed.

Thanks.
Rgds
Shine

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AM4378: PWM signal issue when CMPB is equal to PWM period