SBOA600 July   2024 ISOTMP35

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Calculating Thermal Response Time
    2. 1.2 Current Design with Non-Isolated Temperature Sensors
    3. 1.3 Proposed Design Using the ISOTMP35 Isolated Temperature Sensor
  5. 2Experiment Setup
    1. 2.1 Step 1: Prepare the Oil Bath
    2. 2.2 Step 2: Prepare the Liquid Gallium
    3. 2.3 Step 3: Submerge the Copper Pad
    4. 2.4 Step 4: Prepare Each PCB Configuration
    5. 2.5 Step 5: Testing Each PCB Configuration
    6. 2.6 Test Results
  6. 3Summary
  7. 4References

3 Summary

The ISOTMP35 offers a significantly improved temperature response time over an NTC design. Having a faster response time coupled with a more accurate final temperature has several benefits for a customer. Safety can be improved using ISOTMP35, because ISOTMP35 can get much closer to the correct final temperature. This means that if an over temperature event occurred, having an NTC design that reads too low can miss a critical temperature event. A faster response time also means system lifetime may increase, since it will be exposed to an over temperature situation for a much shorter amount of time. In addition, a more accurate final value means that engineers can spend less time on thermal modeling. When using a non-isolated NTC that requires heat to travel across FR4, that heat transfer may need to be modeled and compensated for in software if the temperature drop off is not acceptable. However, when using ISOTMP35 in direct contact with the high voltage heat source, that modeling time is either not necessary or significantly reduced.