SBAA705 August   2025 ISOTMP35-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2ISOTMP35-Q1 Key Information for Design
    1. 2.1 Simplified Design Schematic to Sense Temperature
    2. 2.2 Temperature Transfer Table
  6. 3PWM Controller UCC28C43-Q1 Key Information for Design
    1. 3.1 UCC28C43-Q1 Internal Block Diagram
    2. 3.2 UCC28C43-Q1 Voltage Mode Setting
    3. 3.3 UCC28C43-Q1 Heating Frequency Setting
  7. 4OPA333-Q1 Key Information
  8. 5Air Heater Circuitry Design Sample
    1. 5.1 Working Mechanism Explanation
    2. 5.2 Air Heater Schematic Design
      1. 5.2.1 Working Condition
      2. 5.2.2 Design Procedure
  9. 6Typical Heater Schematic
  10. 7References

4 OPA333-Q1 Key Information

  • AEC-Q100 qualified for automotive applications
  • Temperature grade 1: -40°C to +125°C, TA
  • Low offset voltage: 10μV (Maximum)
  • 0.01Hz to 10Hz noise: 1.1μVPP
  • Quiescent current: 17μA
  • Single-supply operation
  • Supply voltage: 1.8V to 5.5V
  • Rail-to-rail input and output

Figure 4-1 shows the typical connection for a non-inverting amplifier. The non-inverting amplifier is used to amplify the voltage signal from the ISOTMP35-Q1 analog output port to use the weak temperature signal as feedback for the UCC28C43-Q1 device. The designer can use Equation 1 to calculate the output voltage of OPA333-Q1, or VFB_UCC28C43-Q1 quickly.

OPA333-Q1 Typical Non-Inverting Amplifier Circuitry Figure 4-1 OPA333-Q1 Typical Non-Inverting Amplifier Circuitry
Equation 1. VFB_UC2843L=1+R3R4×VO_ISOTMP35