SLVU479A October   2011  – August 2021 TPS54821

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Performance Specification Summary
    3. 1.3 Modifications
      1. 1.3.1 Output Voltage Setpoint
      2. 1.3.2 Slow-Start Time
      3. 1.3.3 Track In
      4. 1.3.4 Adjustable UVLO
      5. 1.3.5 Input Voltage Rails
  3. 2Test Setup and Results
    1. 2.1  Input/Output Connections
    2. 2.2  Efficiency
    3. 2.3  Output Voltage Load Regulation
    4. 2.4  Output Voltage Line Regulation
    5. 2.5  Load Transients
    6. 2.6  Loop Characteristics
    7. 2.7  Output Voltage Ripple
    8. 2.8  Input Voltage Ripple
    9. 2.9  Powering Up
    10. 2.10 Pre-Bias Start-Up
    11. 2.11 Hiccup-Mode Current Limit
  4. 3Board Layout
    1. 3.1 Layout
  5. 4Schematic and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 Bill of Materials
  6. 5Revision History

1.2 Performance Specification Summary

A summary of the TPS54821EVM-049 performance specifications is provided in Table 1-2. Specifications are given for an input voltage of VIN = 12 V and an output voltage of 3.3 V, unless otherwise specified. The TPS54821EVM-049 is designed and tested for VIN = 8 V to 17 V with the VIN and PVIN pins connect together with the JP1 jumper. The ambient temperature is 25°C for all measurements, unless otherwise noted.

Table 1-2 TPS54821EVM-049 Performance Specification Summary
SPECIFICATIONTEST CONDITIONSMINTYPMAXUNIT
VIN voltage range (PVIN = VIN)81217V
VIN start voltage6.528V
VIN stop voltage6.193V
Output voltage setpoint3.3V
Output current rangeVIN = 8 V to 17 V08A
Line regulationIO = 4 A, VIN = 8 V to 17 V±0.005%
Load regulationVIN = 12 V, IO = 0 A to 8 A±0.07%
Load transient responseIO = 2 A to 6 AVoltage change–130mV
Recovery time80µs
IO = 6 A to 2 AVoltage change130mV
Recovery time80µs
Loop bandwidthVIN = 12 V, IO = 8 A60kHz
Phase marginVIN = 12 V , IO = 8 A74°
Input ripple voltageIO = 8 A900mVPP
Output ripple voltageIO = 8 A10mVPP
Output rise time6ms
Operating frequency480kHz
Maximum efficiencyTPS54821EVM-049, VIN = 8 V, IO = 1.5 A95.9%