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

Principle of the TEC

The principle of TEC is the Peltier effect. When the current passes through a circuit composed of different conductors, there are endothermic and exothermic phenomenon at the joint of each conductor.

Figure 1-1 is a diagram of a TEC. When voltage is applied at the two sides, the electrons travel through Copper to P-type semiconductor, N-type semiconductor, then back to Copper. Due to the energy level transition of electrons, there is heating or cooling at the joint. When the direction of current changes, the heating and cooling sides exchange. The heat absorbed and released is proportional to the current intensity, and is related to the properties of the two conductors and the temperature of the hot end.

GUID-20230526-SS0I-MZ63-NKPB-KJP87QVKW8RM-low.svgFigure 1-1 Structure of TEC Element