TIDA-01604: Any current loop control during light loads especially under BCM/DCM

Wayne Huang

Genius 14355 points

Part Number: TIDA-01604
Other Parts Discussed in Thread: TIDM-1007

Champs,

I am asking this for our customer.

We are aware that there is current control modelling in the doc.

However, we wonder:

Do we only use one current control loop for all load conditions, especially for light load conditions where continuous conduction mode (CCM) may not be not met?

That is, is it possible in light loads the inductor currents are in boundary/discontinuous conduction modes (BCM/DCM) so that our current control loop designed for continuous conduction mode (CCM) may become worse?

Do we have any special algorithm to deal with BCM/DCM or any comment about this?

Wayne Huang

over 5 years ago

0 JohnFullilove over 5 years ago

TI__Expert 5120 points

Wayne, please allow another business day for response to this E2E between the C2000 team and the Automotive Systems team.

Best Regards,
John Fullilove
Texas Instruments

0 Manish Bhardwaj over 5 years ago in reply to JohnFullilove

TI__Mastermind 43730 points

Wayne,

It is dependent on the power stage and whether you are meeting spec.

In this case my understanding is we were meeting spec, I'll be honest I only tested the TIDM-1007 and on that, we definitely meet spec but the SW for both of them is the same.

In fact we observe the opposite, as the inductance variation is very large we nee to change Kp to make sure the system does not go unstable

see table 5

For DCM mode things will not go unstable but you can push more bandwidth through if you change Kp, this is not implemented as part of the solution as it was meeting spec.

-Manish

0 Wayne Huang over 5 years ago in reply to Manish Bhardwaj

TI__Genius 14355 points

Manish,

I see.
Thank you.

Wayne

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TIDA-01604: Any current loop control during light loads especially under BCM/DCM