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

3.1 Input/Output Connections

The TPS54KB20EVM is provided with input connectors, output connectors, and test points as shown in Table 3-1 and Table 3-2.

To support the minimum input voltage with the full rated load on both outputs with the default EVM, a power supply capable of supplying greater than 20 A must be connected to the VIN and PGND terminal blocks (J1 for U1, and J3 for U2) through a pair of 12-AWG wires or better.

For U1, the load must be connected to J2 and for U2, the load must be connected to J4. A pair of 10-AWG wires or better must be used for each connection. With the maximum current limit setting, the maximum load current capability is near 30 A before the TPS54KB20 goes into current limit. Wire lengths must be minimized to reduce losses in the wires.

Table 3-1 Connectors and Jumpers
REFERENCE DESIGNATOR NAME RELATED IC FUNCTION
J1 VIN1 U1 VIN screw terminal to connect input voltage (see Table 1-1 for VIN range)
J2 VOUT1 U1 VOUT screw terminal to connect load to output
J3 VIN2 U2 VIN screw terminal to connect input voltage (see Table 1-1 for VIN range)
J4 VOUT2 U2 VOUT screw terminal to connect load to output
J5 - U2 For TI's internal use only. Do not change the default jumper position.
J6 - U2 For TI's internal use only. Do not change the default jumper position.
J7 - U2 For TI's internal use only. Do not change the default jumper position.
J8 - U2 MSEL selection header. Use shunt to select MSEL resistor (see Table 2-1 for MSEL pin selection)
Table 3-2 Test Points
REFERENCE DESIGNATOR NAME RELATED IC FUNCTION
TP1 VIN1 U1 VIN test point. Use this for efficiency measurements.
TP2 SW1 U1 SW node test point
TP3 VOUT1 U1 VOUT test point
TP4 PGND1 U1 PGND test point. Use this for efficiency measurements.
TP5 VCC1 U1 VCC test point
TP6 PG1 U1 PGOOD output test point (pulled up to VCC pin through a 10-kΩ resistor)
TP7 BODE1- U1 Test point between voltage divider network and output voltage. Used for Bode plot measurements.
TP8 REG_VOUT1 U1 VOUT test point. Use this for efficiency, output regulation, and bode plot measurements.
TP9 PGND1 U1 PGND test point. Use this for efficiency measurements.
TP10 AGND1 U1 AGND test point
TP11 VOUT_U1 U1 SMB connector to measure output voltage. When using this test point, set the scope for 1-MΩ termination. When using 50-Ω termination, a 2:1 divider is created.
TP12 VIN2 U2 VIN test point
TP13 VOUT2 U2 VOUT test point
TP14 SW2 U2 SW test point
TP15 EN2 U2 EN test point
TP16 VCC2 U2 VCC test point
TP17 REG_GND U2 PGND test point. Use this for efficiency measurements.
TP18 PG2 U2 PGOOD output test point (pulled up to VCC pin through a 10-kΩ resistor)
TP19 BODE2- U2 Test point between voltage divider network and output voltage. Used for Bode plot measurements.
TP20 REG_VOUT2 U2 VOUT test point. Use this for efficiency, output regulation, and bode plot measurements.
TP21 SS2 U2 SS test point
TP22 ILIM2 U2 ILIM test point
TP23 MSEL2 U2 MSEL test point
TP24 PGND2 U2 PGND test point. Use this for efficiency measurements.
TP25 AGND2 U2 AGND test point
TP28 SW_U2 U2 SMB connector to measure SW node. When using this test point, set the scope for 50-Ω termination. The combination of 50-Ω termination and 450-Ω series resistance creates a 10:1 attenuation.
TP29 VOUT_U2 U2 SMB connector to measure output voltage. When using this test point, set the scope for 1-MΩ termination. When using 50-Ω termination, a 2:1 divider is created.