SLVUD74A April   2025  – June 2025 LM72880-Q1

 

  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 Test Equipment
      3. 2.1.3 Recommended Test Setup
        1. 2.1.3.1 Input Connections
        2. 2.1.3.2 Output Connections
        3. 2.1.3.3 I2C Connections
      4. 2.1.4 Test Procedure
        1. 2.1.4.1 Graphic User Interface (GUI)
          1. 2.1.4.1.1 Quick Overview
        2. 2.1.4.2 Basic Test Procedure
  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 (CV), ISET Modulation (CC)
      3. 3.1.3 Thermal Performance
      4. 3.1.4 EMI 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
  13. 7Revision History
2.1.4.1.1 Quick Overview

To start, connect the USB2ANY adapter to the computer using USB mini-B connector, connect the USB2ANY adapter to EVM using 10-pin ribbon cable, connect power supply and load to the EVM, power on the EVM, and then launch the configuration GUI.

The GUI automatically connects with the EVM, but if not, in the status bar at the bottom of the GUI, click the Reconnect button to connect to the EVM.

LM72880QEVM-400 Get Started Figure 2-2 Get Started

Finish the I2C interface configuration in step 1 before programming the device. Select LM72880 as the GPN and 8mΩ as the sense resistor value. The device supports standard, fast, and fast-plus modes, but the GUI supports only standard and fast modes. Please select the standard mode as a starting point. Enable the pullup resistors inside the USB2ANY adapter and then click the CONFIGURE USB2ANY button. Select 0x6A as the I2C target address, and then click the CONNECT TO EVM button.

LM72880QEVM-400 Step 1: I2C Interface Configuration Figure 2-3 Step 1: I2C Interface Configuration

In step 2, program the VOUT regulation target to 20V as a starting point, and program the cable compensation gain if required.

LM72880QEVM-400 Step 2: VOUT Programming and CDC Figure 2-4 Step 2: VOUT Programming and CDC

Program the rest of the parameters in step 3, including switching frequency, spread spectrum, CC mode regulation target, OVP, PGOOD, DVS, and VOUT discharge. Program the CC mode regulation target to 5A and the switching frequency to 400kHz as a starting point. After finishing the device programming, the converter can be enabled by toggling on the Enable Converter toggle button when required.

LM72880QEVM-400 Step 3: Evaluation Figure 2-5 Step 3: Evaluation

Each I2C registers and bits can be monitored or programed in the register map. Please program the I2C register map directly if familiar with the device operation and the I2C interface.

LM72880QEVM-400 Register Map Figure 2-6 Register Map