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TPS1HC30-Q1: Current sensing accuracy and thermal calucaltion

Josh Wei
Expert 3029 points
Part Number: TPS1HC30-Q1

Tool/software:

Hi Team,

Current sensing accuracy:

  1. Could you please help with what is the sigma distribution of ISNSI in datasheet?( 3sigma or 6sigma?)
  2. How is the accuracy distributed under different currents? If the Iout current is 5A, what is the accuracy?
  3. How to understand the figure 8-1?

Thermal calculations:

  1. why using Rθjc as junction temperature caluation?
  2. ---SPRA953C

Best Regards

Josh Wei

  • 0
    TI__Expert 3029 points

    Hi team,

    Could anyone can help with this?

    Thanks!

    Josh Wei

  • +1 in reply to Josh Wei
    TI__Genius 10495 points

    Current Sensing Accuracy

    6 sigma is used for ISNS in the datasheet. The accuracy for different load current ranges is documented in the data sheet and tends to be lower for low IOUT. The Figure broadly describes the accuracy loss at lower load currents. The load current and accuracy range are device specific and are stated on the data sheet of every high-side switch

    For the TPS1HC30-Q1 the current sense accuracy is displayed in the electrical characteristics table.

    Thermal Calculations

    Junction to ambient thermal resistance is used to calculate the junction temperature because this value is a measure of the thermal performance of an IC mounted on a PCB. This is based on the JEDEC standard and meant to be a metric which thermal performance can be compared.

    https://www.ti.com/video/5841048435001

    Best Regards,

    Alan