SNVAA70 june   2023 LM5176 , LM5176-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Principle of the TEC
    2. 1.2 Design Specification and Key Challenge
  5. 2Tec Driver Design Using Buck-Boost Controller
    1. 2.1 System Description
    2. 2.2 Block Diagram of TEC Design With LM5176
    3. 2.3 Output Voltage Control of LM5176
  6. 3Test Result
    1. 3.1 TEC Current Versus Output Voltage
    2. 3.2 Current Ripple Measurement Through TEC Element
    3. 3.3 Start-Up
    4. 3.4 Efficiency
  7. 4Summary
  8. 5References

2.2 Block Diagram of TEC Design With LM5176

As shown in Figure 2-1, the TEC is connected between the Vin and Vout of the four-switch-buck-boost controller LM5176. The output voltage is set by the FB pin, which is controlled by the microcontroller and the feedback voltage from the output. For the temperature control, a temperature sensor is required to sense the temperature for feedback control. Due to the characteristics of the TEC, the resistance of the TEC can change as the temperature goes higher so a current sense amplifier is optional for current monitoring. The MSPM0G3507 performs the proportional-integral-derivative control of the whole design to keep or change voltage for heating and cooling.

GUID-20230525-SS0I-NMCG-H5PJ-B6RPHFLHFP0D-low.svgFigure 2-1 Block Diagram of TEC Design Using LM5176