SLUUCR2 October   2023 TPSM843620

 

  1.   1
  2.    TPSM843620EVM 6-A, SWIFT™ Regulator Evaluation Module
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Background
    2. 1.2 Before You Begin
    3. 1.3 Performance Characteristics Summary
  5. 2Configurations and Modifications
    1. 2.1 Output Voltage
    2. 2.2 Switching Frequency (SYNC/FSEL Pin)
    3. 2.3 Current Limit, Soft-Start Time, and Internal Compensation (MODE Pin)
    4. 2.4 Adjustable UVLO
  6. 3Test Setup and Results
    1. 3.1  Input/Output Connections
    2. 3.2  BOM Modifications for Spins
    3. 3.3  Efficiency
    4. 3.4  Output Voltage Regulation
    5. 3.5  Load Transient and Loop Response
    6. 3.6  Output Voltage Ripple
    7. 3.7  Input Voltage Ripple
    8. 3.8  Start-up and Shutdown with EN
    9. 3.9  Start-up and Shutdown with VIN
    10. 3.10 Start-up Into Pre-Bias
    11. 3.11 Thermal Performance
  7. 4Board Layout
    1. 4.1 Layout
  8. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials

3.3 Efficiency

Figure 3-1 through Figure 3-5 show the efficiency for the TPSM843620EVM. Using the selection jumpers for U1, the results for different output voltage and switching frequency combinations are included. The test points listed in Table 3-4 are used for efficiency measurements. Use these test points to minimize the contribution of PCB parasitic power loss to the measured power loss.

Table 3-4 Efficiency Measurement Test Points
TEST POINT NAME REFERENCE DESIGNATOR FUNCTION
VIN_EFF TP3 Input voltage test point.
PGND_EFF TP4 Input ground test point.
VOUT_EFF TP9 Output voltage test point.
PGND_EFF TP10 Output ground test point.
GUID-20231013-SS0I-VQTK-NX4R-XRPPC2H2VQB1-low.svg
VOUT = 1 V fSW = 1000 kHz
Figure 3-1 U1 Efficiency - Default Configuration
GUID-20231013-SS0I-DRTP-NKTS-LRVPP9TPNPJ1-low.svg
VIN = 12 V VOUT = 1 V
Figure 3-3 U1 Efficiency – 1-V Output with Different Switching Frequencies
GUID-20231013-SS0I-FPJ8-1LBX-8N4HG4XJQ1KW-low.svg
VIN = 12 V VOUT = 1.8 V
Figure 3-5 U1 Efficiency – 1.8-V Output with Different Switching Frequencies
GUID-20231013-SS0I-QXXB-2ZPQ-RWS42PSQLL0D-low.svg
VIN = 12 V fSW = 1000 kHz
Figure 3-2 U1 Efficiency – 1000-kHz Switching Frequency with Different Output Voltages
GUID-20231013-SS0I-VL08-2H8Z-8TKRK8K2Z8SR-low.svg
VOUT = 1 V fSW = 1500 kHz
Figure 3-4 U1 Efficiency – 1-V Output and 1500-kHz Switching Frequency with Different Input Voltages