CCS/UCD3138: the code of the UCD3138-HSFB when load current =<16A & load current=30A， FeCtrl0Regs.EADCDAC.bit.DAC_VALUE is different

user5006419

Expert 1795 points

Part Number: UCD3138

Tool/software: Code Composer Studio

the code of the UCD3138-HSFB when load current =<16A ，FeCtrl0Regs.EADCDAC.bit.DAC_VALUE is 11953 ；

but the code of the UCD3138-HSFB when load current =30A ，FeCtrl0Regs.EADCDAC.bit.DAC_VALUE is 13000 （ more bigger）.

When Load current is bigger ， it will go to CPCC mode .

QUESTION : Why Load current is bigger ， FeCtrl0Regs.EADCDAC.bit.DAC_VALUE is bigger ？

over 6 years ago

0 Yitzhak Bolurian over 6 years ago

TI__Mastermind 18370 points

The only routine in the firmware that changes the FeCtrl0Regs.EADCDAC.bit.DAC_VALUE is the the constant power calculation inside the standard interrupt. But in constant power mode the DAC value goes lower when the current is higher.
If you have modified the code, then you should look for calculation errors, sign/polarity issues or overflow situations.

Regards,

0 Yitzhak Bolurian over 6 years ago in reply to Yitzhak Bolurian

TI__Mastermind 18370 points

Hello,

Just wanted to see if this issue is resolved or still pending.
Please let us know if further clarification is required.

Regards,

0 user5006419 over 6 years ago in reply to Yitzhak Bolurian

Expert 1795 points

the resolved is resolved .

thanks

Power management

Power management forum

CCS/UCD3138: the code of the UCD3138-HSFB when load current =<16A & load current=30A， FeCtrl0Regs.EADCDAC.bit.DAC_VALUE is different