SLUUCR5A december   2022  – june 2023 LM74900-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 EVM Applications
  5. 2Description
  6. 3Schematic
  7. 4General Configurations
    1. 4.1 Physical Access
    2. 4.2 Test Equipment and Setup
      1. 4.2.1 Power Supplies
      2. 4.2.2 Meters
      3. 4.2.3 Oscilloscope
      4. 4.2.4 Loads
  8. 5Test Setup and Procedures
    1. 5.1 Power-Up and Power-Down With EN Control
    2. 5.2 Input Overvoltage Test
    3. 5.3 Overcurrent Protection Test
    4. 5.4 Output Hot-Short Test
  9. 6EVAL Board Assembly Drawings
    1. 6.1 PCB Drawings
  10. 7Bill of Materials (BOM)
  11. 8Revision History

5 Test Setup and Procedures

Make sure the evaluation board has default jumper settings as shown in Table 5-1.

Table 5-1 Default Jumper Setting for LM74900Q1EVM Evaluation Board
Jumper Default Setting Functionality
J5 1-2 EN connected to C. EN pulled High.
J6 1-2 SLEEP/ connected to C. SLEEP mode disabled.
J7 1-2 D5 LED indication when output High.
J8 2-3 SLEEP_OV connected to C. Overvoltage cut-off functionality in SLEEP mode.
J10 1-2 TIMER set to 1 ms.
J11 3-4 Overcurrent protection threshold set to 5 A.
J12 1-2 IMON voltage set to 0.54 V/A.
J13 2-3 FLT/ pulled up to C.
GUID-20221128-SS0I-QLQ5-HGHL-HS3CLM9NF10M-low.png Figure 5-1 LM74900Q1EVM Setup With Test Equipment

Use the following instructions before starting any test and repeat again before moving to next test.

  1. Set the power supply output VIN to 0 V.
  2. Turn ON the power supply and set the power supply output VIN to 12 V and current limit of 10 A.
  3. Turn OFF the power supply.
  4. Set the jumper setting on EVM to default position as shown in Table 5-1.