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

2.1 Simplified Design Schematic to Sense Temperature

Figure 2-1 shows the very simple design schematic, this means design engineers can use ISOTMP35-Q1 easily and quickly, the TSENSE pin can connected to target heat source directly without complicated assemble procedure. VDD is in the range of 2.3V to 5.5V, in normal, LDO is a good power supply for ISOTMP35-Q1.

ISOTMP35-Q1 Typical Schematic Figure 2-1 ISOTMP35-Q1 Typical Schematic

Figure 2-2 shows RC filter design consideration when designer gets started real design, to remove noise from ADC unit or other noise source, normally this needs RC filter network on the front of analog output port in ISOTMP35-Q1, please note, the total capacitance (C17+C20) on the analog output of ISOTMP35-Q1 must not be more than 1000pF, R15 MUST be in the range of 10K to 100K

ISOTMP35 Front RC Filter Design Consideration Figure 2-2 ISOTMP35 Front RC Filter Design Consideration