SLUUCK9 april   2023 TPSM843B22

 

  1.    TPSM843B22EVM 20-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

2.1 Output Voltage

There are a few ways to set the output voltage. First, jumper J6 can be used to select between the options shown in Table 2-1 for output voltages greater than 1.0 V. If the desired output voltage is not available, a resistor must be changed. For output voltages less than 1.0 V, TI recommends shorting pins 1 and 2 and decreasing R14. The desired value for R14 can be calculated with Equation 2, where RFBB is R16 which is 10 kΩ.

Equation 1. VOUT=VREF×RFBB + R14RFBB
Equation 2. R14=RFBB×VOUT - VREFVREF
Table 2-1 VOUT Selection
JUMPER J6 SETTINGSELECTED BOTTOM FB RESISTOR (RFBB)NOMINAL OUTPUT VOLTAGE
1 to 2 pin shorted(1)10 kΩ1.0 V
3 to 4 pin shorted7.15 kΩ1.2V
5 to 6 pin shorted3.9 kΩ1.80 V
7 to 8 pin shorted1.78 kΩ3.3 V
9 to 10 pin shorted1.10 kΩ5.0 V
11 to 12 pin shorted768 Ω7.0 V
(1) Default Setting