UCD3138HSFBEVM-029: UCD3138HSFBEVM-029 Load Current Sensing Inaccurate

zoujiangyilang

Hello, I did experiment with the UCD3138HSFBEVM-029. Among them, the GUI shows the output current value is the development board of the actual output current value of 0.7 times.For example, the actual load current is 2A and the GUI is shown as 1.4A ,why?

over 8 years ago

0 Yunsheng Qu over 8 years ago

TI__Genius 9790 points

Hi,

Thanks for your interest in TI here.

How did you get UCD3138HSFBEVM-029? Is there any hardware modification in this board?
what is the current accuracy when load increase?

Regards,
Yunsheng

0 zoujiangyilang over 8 years ago in reply to Yunsheng Qu

Genius 4560 points

Hi,

From TI official online ordering, shipped from the factory.
2 sets of development boards are the same problem.
Hardware is not modified，Just test the waveform after power on.
With 2.01A load, GUI display is 1.33A.

Regards,
YangZou

0 Yunsheng Qu over 8 years ago in reply to zoujiangyilang

TI__Genius 9790 points

Hi, YangZou

The code of UCC3138HSFBEVM-029 is sample code, it may not cover every item for power supply design. Customer should implement related code of your requirement.

To achieve current accuracy, you may need calibrate current sensing circuit and report data on GUI.

BR,

Yunsheng

0 zoujiangyilang over 8 years ago in reply to Yunsheng Qu

Genius 4560 points

ok，thanks。

Power management

Power management forum

UCD3138HSFBEVM-029: UCD3138HSFBEVM-029 Load Current Sensing Inaccurate