NEED OF SLOPE COMPENSATION IN CURRENT MODE CONTROL TECHNIQUE

sudeep e

Intellectual 525 points

Other Parts Discussed in Thread: UCC28C43

HI,

CAN ANYONE GUIDE ME WHAT IS THE NEED FOR SLOPE COMPENSATION IN CURRENT MODE CONTROL TECHNIQUES(SMPS).

WHAT HAPPENS IF WE DON'T DO IT

over 9 years ago

0 JohnTucker over 9 years ago

TI__Guru**** 191445 points

For details about slope compensation, you could start here:

www.ti.com/.../slua101.pdf

and here:

www.ti.com/.../slua110.pdf

and here:

www.ti.com/.../snva555.pdf

I'm sure there are many, many more reference articles if you search for them.

0 sudeep e over 9 years ago in reply to JohnTucker

Intellectual 525 points

Thank you

0 sudeep e over 9 years ago in reply to sudeep e

Intellectual 525 points

i have already gone through these pdf 's...but still i didn't got the clarity regarding slope compensation.

0 JohnTucker over 9 years ago in reply to sudeep e

TI__Guru**** 191445 points

If you have specific questions, I can try to answer.

0 sudeep e over 9 years ago in reply to JohnTucker

Intellectual 525 points

How to get the exact downslope signal to add, for slope compensation. for any particular input.

0 JohnTucker over 9 years ago in reply to sudeep e

TI__Guru**** 191445 points

All the parts that I support have the slope compensation applied internally. There is no need for the user to be concerned with it. Which device are you trying to design with?

0 sudeep e over 9 years ago in reply to JohnTucker

Intellectual 525 points

UCC28C43 IC

0 JohnTucker over 9 years ago in reply to sudeep e

TI__Guru**** 191445 points

see section 9.2.2.10.2 on page 30 of the UCC28C43 datasheet for details on designing the slope compensation.

0 sudeep e over 9 years ago in reply to JohnTucker

Intellectual 525 points

Thank you JohnTucker .

0 sudeep e over 8 years ago in reply to sudeep e

Intellectual 525 points

hi johntucker , what is the need of slope compensation. what happenes if i dont do

0 JohnTucker over 8 years ago in reply to sudeep e

TI__Guru**** 191445 points

Slope compensation is required for duty cycles greater than 50 % to avoid oscillation.

0 JohnTucker over 8 years ago in reply to sudeep e

TI__Guru**** 191445 points

The difference between the average inductor current and the dc value of the sampled inductor current can cause instability for certain operating conditions. This instability is known as sub-harmonic oscillation, which occurs when the inductor ripple current does not return to its initial value by the start of next switching cycle. Sub-harmonic oscillation is normally characterized by observing alternating wide and narrow pulses at the switch node.

The links I provided above contain a lot of information on this topic.

Power management

Power management forum

NEED OF SLOPE COMPENSATION IN CURRENT MODE CONTROL TECHNIQUE