High Resolution PWM module in Both Edge Control using CMPAHR

Muhammad Waqar Azhar52965

Intellectual 290 points

hi,

i am using high resolution PWM module for controlling my Buck Converter

previosly i was using normal PWm ,then i migrated to HRPWM

i am trying to use the HRPWM for controlling both edges for better accuracy using CMPAHR ,is this possible

if yes ,which piints should i consider

regard

waqar

over 14 years ago

0 Daniel Chang over 14 years ago

TI__Expert 4120 points

Hi Waqar,

Do you require symmetric PWM such as with up-down count mode?

If not, you can use up-count and set ePWM-A to SET on CTR=ZERO event and CLEAR on CTR=CMPA-UP event to achieve Hi-Res.

Regards,
Daniel

0 Muhammad Waqar Azhar52965 over 14 years ago in reply to Daniel Chang

Intellectual 290 points

hi Daniel,

actually i need symetric PWM AS its a requirement

do you mean that its impossible to use both edges with CMPA

now i just implemented falling edge with symetric PWM setting on CTR=CMPA down and Clearing on CTR=CMPA up

it seems to work fine ,but it still gives me enough performance

regard

waqar

0 Muhammad Waqar Azhar52965 over 14 years ago in reply to Daniel Chang

Intellectual 290 points

hi Daniel,

actually i need symetric PWM AS its a requirement

do you mean that its impossible to use both edges with CMPA

now i just implemented falling edge with symetric PWM setting on CTR=CMPA down and Clearing on CTR=CMPA up

it seems to work fine ,but it still doesn't gives me enough performance

regard

waqar

0 Daniel Chang over 14 years ago in reply to Muhammad Waqar Azhar52965

TI__Expert 4120 points

I believe that when configured for up-down count and BE control, the PWM module will allow for high-resolution positioning of both the rising and falling edges for high-resolution duty using CMPAHR register.

C2000™︎ microcontrollers

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High Resolution PWM module in Both Edge Control using CMPAHR