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

1.1 Background

The TPS54KB20 DC/DC converter are synchronous buck converters designed to provide up to a 25-A output. Rated input voltage and output current range for the evaluation module are given in Table 1-1.

The high-side and low-side MOSFETs are incorporated inside the TPS54KB20 package along with the gate-drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS54KB20 to achieve high efficiencies and helps to keep the junction temperature low at the rated output current. An external divider allows for an adjustable output voltage. The TPS54KB20 MSEL pin provides selectable switching frequency, light load operation mode, and internal compensation. Current limit setting and soft start configuration are set via ILIM and SS pins respectively. Lastly, the TPS54KB20 includes an enable pin and a power good output which can be used for sequencing multiple regulators.

This evaluation module includes two designs with the TPS54KB20. The first design (U1) is designed to demonstrate the small printed-circuit-board areas that can be achieved when designing with the TPS54KB20 regulator. The small area design fits within 250 mm2. The second design (U2) is designed to demonstrate the high efficiency that can be achieved when designing with the TPS54KB20 regulator. The second design also includes jumpers that can be used to easily evaluate the features of the TPS54KB20.

Table 1-1 Input Voltage and Output Current Summary
EVM RELATED IC INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE
TPS54KB20EVM U1 VIN = 8 V to 16 V 0 A to 25 A
TPS54KB20EVM U2 VIN = 4.5 V to 16 V 0 A to 25 A