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TPS92410: ADIM(limit) relationship to 3V reference

Doug Wendt
Prodigy 70 points
Part Number: TPS92410

Is the 1.5V of the ADM(limit) derived from or proportional to the 3V reference voltage?

Both are specified as +/- 5% tolerance

If derived then: If the 3V reference is at 3V +5%, then the 1.5V ADIM(limit) will be at 1.5V +5%

If separate and independent: Then 3V can be at 3V +5%, while the ADIM(limit) can be at 1.5V -5%

Can TI answer this?

  • 0
    TI__Mastermind 28655 points
    Looking at the block diagram and graphs, the one versus temperature, I would say the 1.5 is not generated from the 3.0 volt reference. It looks like they both track very similar in relation to temperature. I am researching this more to get more detail on this and which method would be more accurate.

    Regards,
  • 0 in reply to Irwin Nederbragt
    TI__Mastermind 28655 points
    Hello,

    So the 3 volt reference is generated from the 1.5 volt reference via a buffer so they will track each other. The 3.0V reference may have a little more spread compared to the 1.5V reference due to the Vio of the buffer.

    So the answer you're looking for is it would be more accurate to use the 3.0V reference to generate the ADIM voltage (if it's scaled to the overall 3.0V reference value such as a resistor divider would). This is sort of reversing how the 3.0V reference is generated in the first place.

    Regards,
  • 0 in reply to Irwin Nederbragt
    Prodigy 70 points

    Thank you for getting to the bottom of this.

    Couldn't imagine that they would generate separate and independent reference voltages.