SNVU837 January   2023 LMR43620-Q1

 

  1.   LMR43620RQ5EVM-400 EVM User’s Guide
  2.   Trademarks
  3. 1Setup
    1. 1.1 Test Points
    2. 1.2 Jumpers
  4. 2Operation
    1. 2.1 Quick Start
  5. 3Schematic
  6. 4Board Layout
  7. 5Bill of Materials
  8. 6Test Results
    1. 6.1 LMR43620RQ5EVM-400 Test Results
      1. 6.1.1 Efficiency and Load Regulation
      2. 6.1.2 Load Transients
      3. 6.1.3 Output Ripple and Thermal Picture
      4. 6.1.4 Conducted EMI

1.1 Test Points

The test points on the board can be used for connecting to the input of a power supply and output load for the EVM. See Figure 1-1 for typical test setup. The functions of the test points connections are:

  • VIN_EMI — Input supply to EVM including an EMI filter. Connect to a suitable input supply. Connect at this point for EMI test.
  • GND_EMI — Ground connection for the input supply
  • VIN — Input supply to the IC. Can be connected to DMM to measure input voltage after EMI filter.
  • VOUT — Output voltage test point of EVM. Can be connected to a desired load.
  • GND — Ground test points
  • EN — This test point is connected to the EN pin. By default, there is a pullup resistor, R1 (RENT), to VIN to enable the IC.
  • PGOOD — This test point is connected to the PGOOD pin from the IC. Can be tied to an external supply through a pullup resistor or left open.
  • RT — In a RT trim part, this test point is connected to the RT pin of the IC through shunt resistor R9 (RJM). Make sure R9 (RJM) is installed and R8 (RT) is not installed when using jumper J3 (JRT) to connect the RT pin to Vcc or to GND.
Figure 1-1 EVM Board Connections