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

3.1 TEC Current Versus Output Voltage

Figure 3-1, Figure 3-2, and Figure 3-3 show the waveform of Vout, SW1, SW2, and ITEC when Vout < Vin. The maximum voltage applied to the TEC element is about +10 V and ITEC is tested up to 4.34 A. Figure 3-4, Figure 3-5, and Figure 3-6 show the waveforms of LM5176 when Vout > Vin. In contrast to above, the maximum voltage is approximately -10 V and ITEC is up to -4.42 A.

CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITEC
CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITECGUID-20230525-SS0I-RDBR-KTRJ-Z3PQTRDTGB1L-low.pngFigure 3-1 15-V Input, 5-V Output. CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITEC
CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITECGUID-20230531-SS0I-N5DF-WBQ4-D4RJCLQF6JKZ-low.pngFigure 3-3 15-V Input, 13-V Output. CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITEC
CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITECGUID-20230525-SS0I-WGZP-TM1K-4NVRN3CKLRBP-low.pngFigure 3-5 15-V Input, 21-V Output. CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITEC
CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITECGUID-20230531-SS0I-DCHW-BWVV-ZDGS870CQBPB-low.pngFigure 3-2 15-V Input, 9-V Output. CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITEC
CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITECGUID-20230525-SS0I-BSF9-XGW1-FMPPBWZ0W7JR-low.pngFigure 3-4 15-V Input, 17-V Output. CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITEC
CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITECGUID-20230525-SS0I-3BTJ-2GHZ-TGCG4BXL3BSK-low.pngFigure 3-6 15-V Input, 25-V Output. CH1: SW1, CH2: SW2, CH3: VOUT, CH4: ITEC