SLVUD75 February   2025

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Test Setup and Procedure
      1. 2.1.1 EVM Connections
      2. 2.1.2 Efficiency Test Equipment
      3. 2.1.3 Recommended Test Setup
  9. 3Implementation Results
    1. 3.1 Test Data and Performance Curves
      1. 3.1.1 Efficiency
      2. 3.1.2 Operating Waveforms
        1. 3.1.2.1 Start-Up and Shutdown
        2. 3.1.2.2 Switching
        3. 3.1.2.3 Load Transient
      3. 3.1.3 Thermal Performance
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks
  12. 6Device and Documentation Support
    1. 6.1 Device Support
      1. 6.1.1 Development Support
    2. 6.2 Documentation Support
      1. 6.2.1 Related Documentation
        1. 6.2.1.1 PCB Layout Resources
        2. 6.2.1.2 Thermal Design Resources

2.1.1 EVM Connections

The recommended test setup is shown in Figure 2-1. Working at an ESD-protected workstation, make sure that any wrist straps, boot straps, or mats are connected and referencing the user to earth ground before handling the EVM. The TPS26742EQ1EVM is designed to support up to two LM72650QEVM EVMs.

LM72650QEVM EVM Test Setup Figure 2-1 EVM Test Setup
LM72650QEVM EVM Test Setup for Efficiency Measurement Figure 2-2 EVM Test Setup for Efficiency Measurement
CAUTION:
LM72650QEVM
Hot surface. Contact can cause burns. Do not touch.
Table 2-1 Power Connections
REF DES LABEL DESCRIPTION
J1 VIN+ Positive input voltage power connection
J1 VIN– Negative input voltage power connection
J5 VOUT+ Positive output voltage power connection
J5 VOUT– Negative output voltage power connection
Table 2-2 J9 Connections
Number LABEL DESCRIPTION
1 IMON/Bypass IMON connection / bypass MOSFET control
2 PTC Temperature sensing
3 LDO_3V3 3.3V LDO output from TPS26742EQ1EVM
4 nINT Interrupt indicator pin
5 Discharge External discharge MOSFET control
6 SDA I2C data connection
7 GND Ground connection
8 SCL I2C clock connection
9 VDDA VDDA output to TPS26742EQ1EVM
10 GND Ground connection
Table 2-3 J8 Jumper
NUMBER LABEL DESCRIPTION
1,3,5,7 CONFIG/IMON CONFIG/IMON connection
2 R18 41.2kΩ configuration resistor connection. Default connection is #1 – #2.
4 R19 54.9kΩ configuration resistor connection
6 R20 71.5kΩ configuration resistor connection
8 R21 90.9kΩ configuration resistor connection
Table 2-4 J4 Jumper
NUMBER LABEL DESCRIPTION
1 AGND Ground connection
2 PFM PFM connection. Connect #1 to #2 for FPWM . Connect #2 to #3 for PFM. Default connection is #2 – #3.
3 VDDA VDDA connection
Table 2-5 J7 Jumper
NUMBER LABEL DESCRIPTION
1 IMON IMON connection
2 BYP Connect #1 to #2 for IMON sensing. Connect #2 to #3 for external bypass switch control. Default connection is #1 – #2.
3 VON Bypass MOSFET control
Table 2-6 J2 Jumper
NUMBER LABEL DESCRIPTION
1 LDO_3V3_EN LDO_3V3_EN from TPS26742EQ1EVM
2 EN Connect #1 to #2 for LDO_3V3_EN enable. Connect #2 to #3 for VIN enable. Default connection is #2 – #3.
3 R2 VIN connection through R2
Table 2-7 J3 Jumper
NUMBER LABEL DESCRIPTION
1,3 Q1 #5 Q1 drain connection.
2,4 Q1 #3 Q1 source connection. Bypass the Q1 switch by connecting #1 – #2, and #2 – #4.
Table 2-8 J6 Jumper
NUMBER LABEL DESCRIPTION
1,3 Q1 #5 Q1 drain connection
2,4 J7 #3 J7 #3 pin connection. Connect #3 – #4 to enable the bypass switch automatically. Default connection is #3 – #4