SLUUCW6 November   2023 LM74930-Q1

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Test Points and Connectors
    2. 2.2 Test Equipment and Setup
      1. 2.2.1 Power Supplies
      2. 2.2.2 Meters
      3. 2.2.3 Oscilloscope
      4. 2.2.4 Loads
    3. 2.3 Test Setup and Procedures
      1. 2.3.1 Power-up and Power-down with Input Voltage
      2. 2.3.2 Unsuppressed Load Dump 200 V - Output Clamp
      3. 2.3.3 Overcurrent Protection Test
      4. 2.3.4 Output Hot-Short Test
  8. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials (BOM)
  9. 4Additional Information
    1.     Trademarks

2.3.3 Overcurrent Protection Test

Use the following instructions to perform the overcurrent test on the LM74930Q1EVM.

  1. Set the input supply voltage VIN to 12 V and current limit of 10 A.
  2. Turn ON the power supply and observe start-up of output voltage, HGATE, and DGATE.
  3. By default the EVM is configured for 4-A overcurrent protection.
  4. Apply 4-A load at the output with rheostat or electronic load and gradually increase the load current to 6 A.
  5. Observe the overload behavior of LM74930-Q1.

Figure 3-5 and Figure 3-6 show test waveforms for an overcurrent fault.

GUID-20231023-SS0I-TTZS-9FQ6-KNLSRG4NR8SZ-low.png Figure 2-5 Overcurrent Response of LM74930-Q1 for a Load Step From 3.8 A to 6 A With 4-A Overcurrent Protection Setting
GUID-20231023-SS0I-QGR6-HFWP-QGJ47CQ4ZLZZ-low.png Figure 2-6 Auto-Retry Response of LM74930-Q1 for an Overcurrent Fault