SLUUCE9A December   2020  – April 2021 TPS543820 , TPS543820E

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Before You Begin
    3. 1.3 Performance Characteristics Summary
  3. 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 (MODE Pin)
    4. 2.4 Adjustable UVLO
  4. 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  Input Voltage Ripple
    7. 3.7  Synchronizing to a Clock
    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 Hiccup Current Limit
    12. 3.12 Overvoltage Protection
    13. 3.13 Thermal Performance
  5. 4Board Layout
    1. 4.1 Layout
  6. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials
  7. 6Revision History

1.1 Background

The TPS543820 dc/dc converter is a synchronous buck converter designed to provide up to a 8-A output. The input (VIN) is rated for 4 V to 18 V. 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 TPS543820 package along with the gate-drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS543820 to achieve high efficiencies and helps keep the junction temperature low at the rated output current. Fixed frequency advanced current mode control allows you to synchronize the regulators to an external clock source. An external divider allows for an adjustable output voltage. The TPS543820 FSEL and MODE pins provide selectable switching frequency, soft start time, current limit, and internal compensation. Lastly, the TPS543820 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 TPS543820. The first design is designed to demonstrate the small printed-circuit-board areas that may be achieved when designing with the TPS543820 regulator. The small area design fits within 100 mm2. The second design is designed to demonstrate the high efficiency that can be achieved when designing with the TPS543820 regulator. The second design also includes jumpers that can be used to easily evaluate the features of the TPS543820.

Table 1-1 Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE
TPS543820EVM VIN = 4 V to 18 V 0 A to 8 A