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

4.1 Physical Access

Table 4-1 lists the LM74900Q1EVM evaluation board input and output connector functionality. Table 4-2 and Table 4-3 describe the test point availability and the jumper functionality.

Table 4-1 Input and Output Connector Functionality
Connector Label Description
J1 VIN Power input connector to the positive rail of the input power supply.
J3 PGND Ground connection for the power supply.
J2 VOUT Power output connector to the positive side of the load.
J9 VOUT_LC Power output connector after the output CLC Filte5.
J4 PGND Ground connection for the load.
Table 4-2 Test Points Description
Test PointsLabelDescription
TP1VINInput power supply to the EVM.
TP2VOUTOutput from the EVM.
TP3, TP4, TP14PGNDEVM ground.
TP5ENEnable input.
TP6VSInput power supply to the IC.
TP7DGATEDiode controller gate drive output.
TP8HGATEGATE driver output for the HSFET.
TP9FLT/Active low open drain fault output.
TP10SLEEP/Active low SLEEP mode input.
TP11TMRFault timer input.
TP12IMONAnalog current monitor output.
TP13CCathode of the ideal diode.
Table 4-3 Jumper and LED Descriptions
JumperConnectionDescription
J51-2EN connected to C. EN pulled High.
2-3EN connected to GND. EN pulled Low.
J61-2SLEEP/ connected to C. SLEEP mode disabled.
2-3SLEEP/ connected to GND. SLEEP mode active.
J71-2Output high D5 LED indication.
J81-2SLEEP_OV connected to VOUT. Overvoltage clamp functionality in SLEEP mode.
2-3SLEEP_OV connected to C. Overvoltage cut-off functionality in SLEEP mode.
J101-2TIMER duration set to 1 ms.
3-4TIMER duration set to 10 ms,
5-6Controller set in latch-off mode,
J111-2Overcurrent protection disabled.
3-4Overcurrent protection threshold set to 5 A.
5-6Overcurrent protection threshold set to 10 A.
J121-2IMON voltage set to 0.54 V/A.
3-4IMON voltage set to 0.27 V/A.