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

2 Experiment Setup

To prove the theory that the ISOTMP35 would provide superior response time to an NTC design, an oil bath was used to compare the ISOTMP35 with an NTC. The experiment was then repeated with an NTC with thermal epoxy.

The experiment is done by pouring liquid gallium inside of a crucible, which is heated by an oil bath set to 75°C. Then a PCB with a 1 square inch copper pad (2oz copper) and the device under test is submerged in that liquid gallium to observe how the device's temperature changes over time.

Response Time System Diagram Figure 2-1 Response Time System Diagram