SLVU892A March   2013  – June 2021 TPS56428

 

  1.   Trademarks
  2. 1Introduction
  3. 2Performance Specification Summary
  4. 3Modifications
    1. 3.1 Output Voltage Setpoint
    2. 3.2 Output Filter and Closed-Loop Response
  5. 4Test Setup and Results
    1. 4.1  Input/Output Connections
    2. 4.2  Start-Up Procedure
    3. 4.3  Efficiency
    4. 4.4  Load Regulation
    5. 4.5  Line Regulation
    6. 4.6  Load Transient Response
    7. 4.7  Output Voltage Ripple
    8. 4.8  Input Voltage Ripple
    9. 4.9  Start-Up
    10. 4.10 Shut-Down
  6. 5Board Layout
    1. 5.1 Layout
  7. 6Schematic, Bill of Materials, and Reference
    1. 6.1 Schematic
    2. 6.2 Bill of Materials
    3. 6.3 Reference
  8. 7Revision History

Introduction

The TPS56428 is a single, adaptive on-time, D-CAP2™-mode, synchronous buck converter requiring a low external component count. The D-CAP2 control circuit is optimized for low-ESR output capacitors such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The switching frequency is internally set at a nominal 650 kHz. Pulse skipping Eco-mode™ operation improves efficiency under light load conditions. The high-side and low-side switching MOSFETs are incorporated inside the TPS56428 package along with the gate-drive circuitry. The low drain-to-source on-resistance of the MOSFETs allows the TPS56428 to achieve high efficiencies and helps keep the junction temperature low at high-output currents. The TPS56428 dc/dc synchronous converter is designed to provide up to a 4-A output from an input voltage source of 4.5 V to 18 V. The output voltage range is from 0.6 V to 7 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1.

The TPS56428EVM-534 evaluation module circuit is a single, synchronous buck converter providing 1.2 V at 4 A from 4.5-V to 18-V input. This user’s guide describes the TPS56428EVM-534 performance.

Table 1-1 Input Voltage and Output Current Summary
EVMInput Voltage RangeOutput Current Range
TPS56428EVM-534VIN = 4.5 V to 18 V0 A to 4 A