SLVUCE3 april   2023 TPS54KB20

 

  1.    TPS54KB20EVM 25-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 Frequency and Operation Mode Setting (MSEL Pin)
  5. 3Test Setup and Results
    1. 3.1 Input/Output Connections
    2. 3.2 Efficiency
    3. 3.3 Output Voltage Regulation
    4. 3.4 Load Transient and Loop Response
    5. 3.5 Output Voltage Ripple
    6. 3.6 Start-up and Shutdown with EN
    7. 3.7 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

2.2 Frequency and Operation Mode Setting (MSEL Pin)

In the U2 design, jumper J8 can change between MSEL pin selections shown in Table 2-1. If the desired option is unavailable, then change one of the resistors to the value that sets the desired option.

In the U1 design, change the MSEL resistor to the value which sets the desired option.

Table 2-1 MSEL Pin Selection
JUMPER SETTING MSEL RESISTOR (kΩ) OPERATION UNDER LIGHT LOAD SWITCHING FREQUENCY (fSW) (kHz) RAMP AMPLITUDE ZERO FREQUENCY (kHz)
1 to 2 pin shorted 0 FCCM 800 2.2x 53
3 to 4 pin shorted 4.99 FCCM 800 1.6x 53
5 to 6 pin shorted 7.50 FCCM 800 1.3x 32
7 to 8 pin shorted 10.5 FCCM 800 1x 32
9 to 10 pin shorted 54.9 Skip-mode 800 2.2x 53
11 to 12 pin shorted 63.4 Skip-mode 800 1.6x 53
13 to 14 pin shorted(1) 73.2 Skip-mode 800 1.3x 32
15 to 16 pin shorted 86.6 Skip-mode 800 1x 32
(1) Default Setting