UCD3138A: Matlab/Simplis Current Programmed Control Implementation

Casey Gross1

Part Number: UCD3138A
Other Parts Discussed in Thread: UCD3138

Hi,

I have been working with our local TI FAE to get a feedback model for the UCD3138 in either matlab or simplis/simetrix.

He was able to share with me an analog representation of a UCD voltage mode feedback loop in terms of the control registers and PID values.

He recommended I ask on this forum if anything was available for current programmed control implementation.

Is there any information on how the UCD3138 implements a current programmed control loop?

Thank you,

Casey

over 6 years ago

0 Bosheng Sun over 6 years ago

TI__Expert 7290 points

Hi, what do you mean "current programmed control loop"? are you talking about average current mode control? peak current mode control?

0 Casey Gross1 over 6 years ago in reply to Bosheng Sun

Prodigy 40 points

Hi,

Sorry for the confusion. I am speaking about peak current mode control.

0 Bosheng Sun over 6 years ago in reply to Casey Gross1

TI__Expert 7290 points

we only have phase shift full bridge peak current mode control model, but it is a mathematic equation, not Matlab/Simplis, do you still need it?

0 Casey Gross1 over 6 years ago in reply to Bosheng Sun

Prodigy 40 points

Yes, this would still be of great benefit to me.

0 Casey Gross1 over 6 years ago in reply to Bosheng Sun

Prodigy 40 points

The application I am using this in is a phase shifted full bridge.

0 Bosheng Sun over 6 years ago in reply to Casey Gross1

TI__Expert 7290 points

an expert is looking at this

0 Amiel Hussain over 6 years ago in reply to Bosheng Sun

TI__Expert 4070 points

Hello,

Here is the compensator equation for PSFB peak current mode:

z = e^(s * Plant.Ts / CLA_Design.Oversample);
VDAC = 1.6;

return (0.00047683897719946744 * 2^( -16.00 - 1.00 * SC) * KCOMP * VDAC * (256.00 * Math.Round(Kd) * (-1.00 + z)^2 + (-1.00 * Alpha + 256.00 * z) * (Math.Round(Kp) * (-1.00 + z) + Math.Round(Ki) * (1.00 + z)))) / ((-1.00 + z) * (-1.00 * Alpha + 256.00 * z));

Power management

Power management forum

UCD3138A: Matlab/Simplis Current Programmed Control Implementation