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

2.3.2 Unsuppressed Load Dump 200 V - Output Clamp

Use the following instructions to verify the overvoltage protection feature of LM74930-Q1.

  1. To test 200 V Unsuppressed Load Dump, the LD200N or similar equipment is needed as the input power supply.
  2. Make sure the J8 jumper setting is set to 2-3.
  3. Set the input supply voltage VIN to 24 V and current limit of 5 A.
  4. Turn ON the power supply and observe start-up of output voltage.
  5. Now apply 200 V Unsuppressed Load Dump using LD200N equipment.
  6. Observe OVCLAMP operation of LM74930-Q1 when input voltage is above OV threshold.
GUID-20231016-SS0I-XSRS-RS6G-BDBC49MMT2WG-low.png Figure 2-4 Unsuppressed Load Dump 200 V - Output Clamp (OVCLAMP = GND)