SLVUDX0 August   2026

 

  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 General Configurations
      1. 2.1.1 Physical Access
      2. 2.1.2 Test Equipment and Setup
  8. 3Implementation Results
    1. 3.1 Test Setup and Procedures
      1. 3.1.1 Input Hotplug Test
      2. 3.1.2 Power Up Into Short
      3. 3.1.3 Reverse Current Blocking Test
      4. 3.1.4 Overvoltage Lockout
      5. 3.1.5 IMON Pin Test
      6. 3.1.6 Output Hot Short
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Drawings
    3. 4.3 Bill of Materials (BOM)
  10. 5Additional Information
    1. 5.1 Trademarks

3.1.6 Output Hot Short

Use the following instructions to perform the output hot short test:

  1. Confirm that the experiment is setup initially as per the instructions in Section 3.1.
  2. Disconnect the electronic load at the output.
  3. Set the input supply voltage VIN1 to 12V and connect the power supply between VIN1 (connector J3-2) and PGND (Connector J3-1).
  4. Turn ON the power supply to power up the EVM.
  5. Short the output of the device for example, VOUT1 (connector J2-1) to PGND (connector J2-2) through a short cable.
  6. Observe the waveforms using an oscilloscope.
LM7320-30EVM Output Hot Short Response for LM7311Figure 3-7 Output Hot Short Response for LM7311
Note: Verify that there is sufficient input capacitor to eliminate voltage dips at the input. A combination of electrolytic and ceramic capacitors are preferred. With these capacitors, a large current can be provided for a short period of time during short-circuit.

Obtaining repeatable and similar short-circuit testing results can be difficult. The following factors contributes to the variation in results:

  • Source bypassing
  • Input leads
  • Board layout
  • Component selection
  • Output shorting method
  • Relative location of the short
  • Instrumentation

The actual short exhibits a certain degree of randomness because the short microscopically bounces and arcs. Verify that the configuration and methods are used to obtain realistic results. Hence, do not expect to see waveforms exactly like the waveforms in this user's guide because every setup is different.