SLUUC48A February   2020  – February 2022 TPS546B24A

 

  1.   Trademarks
  2. 1 Description
    1. 1.1 Before You Begin
    2. 1.2 Typical Applications
    3. 1.3 Features
  3. 2 Electrical Performance Specifications
  4. 3 Schematic
  5. 4 Test Setup
    1. 4.1 Test and Configuration Software
      1. 4.1.1 Description
      2. 4.1.2 Features
    2. 4.2 Test Equipment
      1. 4.2.1 Voltage Source
      2. 4.2.2 Multimeters
      3. 4.2.3 Output Load
      4. 4.2.4 Oscilloscope
      5. 4.2.5 Fan
      6. 4.2.6 USB-to-GPIO Interface Adapter
      7. 4.2.7 Recommended Wire Gauge
    3. 4.3 Tip and Barrel Measurement
    4. 4.4 List of Test Points, Jumpers, and Connectors
    5. 4.5 Evaluating Single Phase Operation
    6. 4.6 Evaluating Split Rail Input
    7. 4.7 Configuring EVM to Overdrive VDD5
  6. 5 EVM Configuration Using the Fusion GUI
    1. 5.1 Configuration Procedure
  7. 6 Test Procedure
    1. 6.1 Line and Load Regulation and Efficiency Measurement Procedure
    2. 6.2 Efficiency Measurement Test Points
    3. 6.3 Control Loop Gain and Phase Measurement Procedure
  8. 7 Performance Data and Typical Characteristic Curves
    1. 7.1  Efficiency
    2. 7.2  Load and Line Regulation (Measured Between TP22 and TP25)
    3. 7.3  Transient Response
    4. 7.4  Control Loop Bode Plot
    5. 7.5  Output Ripple
    6. 7.6  Power MOSFET Drain-Source Voltage
    7. 7.7  Control On
    8. 7.8  Control Off
    9. 7.9  Control On with Pre-Biased Output
    10. 7.10 Current Sharing Between Two Phases
    11. 7.11 Thermal Image
  9. 8 EVM Assembly Drawing and PCB Layout
  10. 9 Bill of Materials
  11. 10Using the Fusion GUI
    1. 10.1  Opening the Fusion GUI
    2. 10.2  General Settings
    3. 10.3  Changing ON_OFF_CONFIG
    4. 10.4  Pop-up for Some Commands While Conversion is Enabled
    5. 10.5  SMBALERT# Mask
    6. 10.6  Device Info
    7. 10.7  Phase Commands
    8. 10.8  All Config
    9. 10.9  Pin Strapping
    10. 10.10 Monitor
    11. 10.11 Status
  12. 11Revision History

2 Electrical Performance Specifications

Table 2-1 lists the electrical performance specifications in room temperature (20 to 25°C). Characteristics are given for an input voltage of VIN = 12 V, unless otherwise specified.

Table 2-1 TPS546B24AEVM-2PH Electrical Performance Specifications
Parameter Test Conditions MIN TYP MAX Unit
Input Characteristics
Input voltage range, VIN 5 12 18 V
Full load input current IOUT = 40 A 3.1 A
Full load input current VIN = 5 V, IOUT = 40 A 7.3 A
No load input current IOUT = 0 A, switching enabled 100 mA
Enable switching threshold Set by default resistor divider, JP2_P1 and JP2_P2 pins 3 and 4 shorted 5.26 V
Disable switching threshold Set by default resistor divider, JP2_P1 and JP2_P2 pins 3 and 4 shorted 4.75 V
Output Characteristics
Output voltage, VOUT 0.8 V
Output load current, IOUT 0 40 A
Output voltage regulation Line regulation: VIN = 5 V to 18 V 0.1%
Load regulation: IOUT = 0 A to 40 A 0.1%
Output voltage ripple IOUT = 40 A 9 mVpp
Output voltage undershoot IOUT = 10-A to 30-A step at 10 A/µs 100 mV
Output voltage overshoot IOUT = 30-A to 10-A step at 10 A/µs 100 mV
Output overcurrent fault threshold Phase current limit setting of U1_P1 programmed by MSEL2 26 A
Phase current limit setting of U1_P2 programmed by MSEL2 26 A
Systems Characteristics
Switching frequency Programmed by MSEL1 550 kHz
Full load efficiency, VOUT(1) IOUT = 40 A 86.8%
Operating case temperature IOUT = 40 A, 10 minute soak 50 °C
Loop bandwidth IOUT = 20 A 60 kHz
Phase margin 56 °
PMBus Interface and Pin-Strapping
U1_P1 PMBus address Programmed by NVM and ADRSEL 36 Decimal
U1_P1 Voltage reference Default setting of VOUT_COMMAND programmed by VSEL 800 mV
U1_P1 Soft-start time (TON_RISE) Default setting of TON_RISE programmed by MSEL2 3 ms
(1) The efficiency is measured using the test points listed in Table 6-2 to minimize the effect of DC drops caused by on-board copper traces.