TMS320F280025: RAMP module inside CMPSS

Jack Tan80

Part Number: TMS320F280025

Dear C2000 expert,

Currently I plan to use ramp module inside CMPSS to realize slope compensation for PCMC(peak current mode control), is it possible to get RAMPSTS as below picture? What I expect is that the RAMPSTS will be decreased to 0 before the next EPWMSYNPER occurs, and RAMPSTS could be keep to 0 until EPWMSYNPER recieved.

One more question, when does the COMPHSTS be triggered? What's purpose of COMPHSTS to reload RAMPSTS? Is it possible to configure ramp ignore this signal?

over 4 years ago

+1 Frank Ankapong over 4 years ago

TI__Mastermind 28275 points

Hi Jack,

No, it is not possible to have the rampgen stay at 0 because at some point before it reaches 0, it will trip the comparator which will reset the rampgen.

Can I ask what you are trying to accomplish by having it stay at 0?

0 Frank Ankapong over 4 years ago

TI__Mastermind 28275 points

The only alternative is to have the rampgen start below the trip point like it is shown in the diagram but I'm not sure of the usefulness of this so maybe you can expand on why you need to do this so we can see if there is another way.

0 Jack Tan80 over 4 years ago in reply to Frank Ankapong

Mastermind 7110 points

Hi Frank,

Thanks for your suggestion.

Frank Ankapong said:
No, it is not possible to have the rampgen stay at 0 because at some point before it reaches 0, it will trip the comparator which will reset the rampgen.

I think you're right, it uneccesary to have rampgen stay at 0. I think this is resovled. Thanks...

0 Frank Ankapong over 4 years ago in reply to Jack Tan80

TI__Mastermind 28275 points

Hi Jack,

Glad to help. Let us know if any more issues come up.

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TMS320F280025: RAMP module inside CMPSS