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TPS546D24A: OV Fault & Warn & adj value

Trenton Reed
Expert 3010 points
Part Number: TPS546D24A

Hi Team,

Can you please explain what the "adj" value is that is located in the Fusion Digital Power Designer tool, monitor tab, and next to all the OVF/OVW/Vout/UVW/UVF values?

Why is the Vout adj value the only one that is equal to the value set and all the other fault and warning adj values are different than the setting?

While using the dual-phase TPS546D24A EVM with the GUI, the OVF/OVW/UVW/UVF lines in the Vout plot are all at the level of "adj" value instead of the value manually set. Why is the "adj" value being used?

No faults in writing to hardware.

Thank you,

Trenton Reed

  • 0
    TI__Guru 56825 points

     

    The TPS546D24A allows for two different data entry formats for output voltage related values like Margin High, Margin Low, OV Warn, OV Fault, UV Warn and UV Fault, depending on the setting of the VOUT_MODE command.

    When VOUT_MODE bit 7 = 1 (Default) the command entry value is in Relative Mode, and the value of the command is multiplied by the output voltage to get the analog value of the setting.

    For example, VOUT_OV_FAULT_LIMIT = 1.200 would set the OV_FAULT limit to 120% of the programmed output voltage.  For VOUT_COMMAND = 0.8V, that would be 1.2 x 0.8 = 0.96V

    When VOUT_MODE bit 7 = 0, the command entry value is in Absolute mode, and the value of the command is taken directly in volts.  So VOUT_OV_FAULT_LIMIT = 1.2 would still be 1.2V if VOUT_COMMAND is 0.8V.

    FUSION is trying to display both the relative and absolute values, but it looks like the lastest release is calculating the values incorrectly.

    Instead of displaying the relative value and then "adjusting" to the absolute value, it's displaying the absolute value and then multiplying that value by VOUT_COMMAND again, so using the above example:

    VOUT_COMMAND = 0.800V

    VOUT_OV_FAULT_LIMIT = 1.2 (0.96)

    the adjust value would be displayed as 0.96 x 0.8 = 0.768.  I will submit a ticket to have someone look into it, but it likely will not get corrected until next year.