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

2.1 Output Voltage

Equation 1. GUID-7EFA87CC-963A-4B99-934F-5AC996415324-low.gif

The TPSM843620EVM comes with fixed 10 kΩ RFBT and RFBB for an output voltage of 1 V. However, the output voltage can still be changed by changing the feedback resistor values. The resistor values can be changed according to this table for certain output voltage options in Table 2-1. If the desired output voltage is not available, a resistor must be changed and the required value for can be calculated with Equation 2.

Equation 2. GUID-1995610E-1FD6-468D-8C12-9E95027BECD8-low.gif
Table 2-1 VOUT Selection
TOP FB RESISTOR (RFBT ) BOTTOM FB RESISTOR (RFBB)NOMINAL OUTPUT VOLTAGE
R3 = 10 kΩR9 = 16.66 kΩ0.800 V
R3= 10 kΩ(1)R9 = 10.00 kΩ1.000 V
R3 = 10 kΩR9 = 7.14 kΩ1.200 V
R3 = 10 kΩR9 = 5.00 kΩ1.500 V
R3 = 10 kΩ R9 = 3.84 kΩ 1.802 V
R3 = 10 kΩR9 = 1.78 kΩ3.309V
(1) Default Setting