SNVU934 December   2024

 

  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 EVM Setup
      1. 2.1.1 Quick Start
      2. 2.1.2 Test Points
  9. 3Implementation Results
    1. 3.1 Performance Data and Results
      1. 3.1.1 Efficiency, Load Regulation, and Dropout
      2. 3.1.2 Load Transients
      3. 3.1.3 Start-Up and Shutdown
      4. 3.1.4 Hiccup Mode Protection
      5. 3.1.5 Thermal Performance
      6. 3.1.6 CISPR25 Class 5
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 Board Layout
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks

2.1 EVM Setup

This section describes the test points and connectors on the EVM and how to properly connect, set up, and use the LMR60410QEVM.

The EVM uses the LMR60410-Q1 converter, which includes MODE/SYNC capability. This statement means that the device can operate in pulse frequency modulation (PFM) light-load mode when this pin is tied to GND. TI has observed additional output voltage ripple at input voltages close to the output voltage when the device is operating in PFM light-load mode. To see improved performance, TI recommends to configure the EVM to operate in forced pulse width modulation (FPWM) mode. To access the FPWM light-load operating mode, depopulate resistor R8 and populate resistor R6.

LMR60410QEVM EVM Board ConnectionsFigure 2-1 EVM Board Connections

The test setup consists of the following instruments in addition to the EVM board.

  • Power supply: The input DC voltage source must be capable of supplying 36V and 1A.
  • Load: The load must be an electronic, constant-current (CC) or constant-resistance (CR) mode load, capable of supporting 1A of load current at 3.3V. Disconnect the electronic load when performing no-load input current tests.
  • Multimeters:
    • Voltmeter 1: Measures input voltage at VIN+ (TP14) and VIN- (TP15)
    • Voltmeter 2: Measures output voltage at VOUT (TP16) and VOUT- (TP17)
    • Ammeter 1: Measures input current.
    • Ammeter 2: Measures output current.
  • Oscilloscope: With the scope set to 20MHz bandwidth and AC coupling, measure the output voltage ripple directly across an output capacitor with a short ground lead. Place the oscilloscope probe tip on the positive terminal of the output capacitor, and the ground lead on the negative terminal of the output capacitor. TI does not recommend using a long-leaded ground connection because the connection can induce additional noise due to a large ground loop. To measure other waveforms, adjust the oscilloscope as necessary.