SLUUCS7 april   2023 TPSM843A26

 

  1.    TPSM843A26EVM 16-A, Regulator Evaluation Module
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Background
    2. 1.2 Before You Begin
    3. 1.3 Performance Characteristics Summary
  4. 2Configurations and Modifications
    1. 2.1 Output Voltage
    2. 2.2 Switching Frequency (FSEL Pin)
    3. 2.3 Current Limit, Soft-Start Time, and Internal Compensation (MSEL Pin)
    4. 2.4 Enable, UVLO (EN Pin)
  5. 3Test Setup and Results
    1. 3.1 Input and Output Connections
    2. 3.2 Efficiency
    3. 3.3 Output Voltage Regulation
    4. 3.4 Load Transient and Loop Response
    5. 3.5 Input Voltage Ripple
    6. 3.6 Start-up and Shutdown with EN
    7. 3.7 Start-up and Shutdown with VIN
    8. 3.8 Start-up Into Pre-Bias
    9. 3.9 Thermal Performance
  6. 4Board Layout
    1. 4.1 Layout
  7. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials

3.2 Efficiency

Figure 3-1 through Figure 3-5 shows the efficiency for the TPSM843A26EVM. Using the selection jumpers for U1, the results for different output voltage and switching frequency combinations are included. The test points listed in Table 3-3 are used for the efficiency measurement. Use these test points to minimize the contribution of PCB parasitic power loss to the measured power loss.

Table 3-3 Efficiency Measurement Test Points
TEST POINT NAMEREFERENCE DESIGNATORFUNCTION

VIN S+

TP1Input voltage test point connected near J1

VIN S-

TP2PGND reference test point for input voltages Kelvin connected

VOUT S+

TP10

Output voltage test point connected near J8

VOUT S-

TP11

PGND reference test point for output voltages Kelvin connected
GUID-20230406-SS0I-QQGB-D16K-XNWJNQJBCNCH-low.svg
VOUT = 1 VfSW = 1000 kHz
Figure 3-1 Efficiency – Default Configuration
GUID-20230406-SS0I-T2RH-KGG9-ZM1FPPPCC5MF-low.svg
VOUT = 1 VfSW = 1500 kHz
Figure 3-3 Efficiency – 1500-kHz Switching Frequency with Different Input Voltages
GUID-20230406-SS0I-PNGH-XMMW-NGCHSMTC4BQ6-low.svg
VIN = 12 VVOUT = 1.8 V
Figure 3-5 Efficiency – 1.8-V Output with Different Switching Frequencies
GUID-20230406-SS0I-8FGL-MGNX-WWQPBNJF5MHG-low.svg
VIN = 12 VfSW = 1000 kHz
Figure 3-2 Efficiency – 1000-kHz Switching Frequency with Different Output Voltages
GUID-20230406-SS0I-CM9X-GMLC-6CCX2HMSCZDF-low.svg
VIN = 12 VVOUT = 1 V
Figure 3-4 Efficiency – 1-V Output with Different Switching Frequencies