SNVU843B April   2023  – June 2025

 

  1.   1
  2.   LM5171 Evaluation Module
  3.   Trademarks
  4. 1Features and Electrical Performance
  5. 2Setup
    1. 2.1 EVM Configurations
    2. 2.2 Bench Setup
    3. 2.3 Test Equipment
    4. 2.4 Jumper Settings for Typical Operation Modes
      1. 2.4.1 Buck Mode with Voltage Regulation
      2. 2.4.2 Boost Mode with Voltage Regulation
      3. 2.4.3 Buck Mode with Current Regulation
      4. 2.4.4 Boost Mode with Current Regulation
      5. 2.4.5 Single Phase Operation
      6. 2.4.6 2-EVM Daisy-Chain for 3 or 4-Phase Operation
  6. 3Test Procedure
    1. 3.1 Buck Mode Power-Up and Power-Down Sequence
    2. 3.2 Boost Mode Power-Up and Power-Down Sequence
    3. 3.3 Bidirectional Operation Power-Up and Power-Down Sequence
    4. 3.4 Operating the EVM With External MCU or Other Digital Circuit
    5. 3.5 How to Adjust the Output Voltage
  7. 4Test Data
    1. 4.1 Efficiency and Thermal Performance
    2. 4.2 Step Load Response
    3. 4.3 Dual-Channel Interleaving Operation
    4. 4.4 Typical Start Up and Shutdown
    5. 4.5 DEM and FPWM
    6. 4.6 Mode Transition Between DEM and FPWM
    7. 4.7 ISET Tracking and Pre-Charge
    8. 4.8 Pre-charge
    9. 4.9 Protections
  8. 5Design Files
    1. 5.1 Schematics
    2. 5.2 Bill of Materials
    3. 5.3 Board Layout
  9. 6Revision History

2.2 Bench Setup

For buck mode or boost mode operation, one Power Supply (PS) and one Electronic Load (E-Load) are enough to perform the test as shown in Jumper Settings for Typical Operation Modes.

For bidirectional operation, Figure 2-3 shows the typical bench setup to operate the EVM in the bidirectional power system environment. The combination of the E-Load and bench PS emulates a battery capable of both sourcing and sinking current. A relatively Higher Voltage Power Supply (HV-PS) and E-Load (HV-E-Load) are needed for the 48VDC-port, and a Lower Voltage Power Supply (LV-PS) and E-Load (LV-E-Load) are needed for the 12VDC-port.

The user can externally provide the dashed line signals, or use the onboard jumpers to set these signals, when operating the EVM.

LM5171-Q1 Bidirectional Converter Bench Setup Figure 2-3 Bidirectional Converter Bench Setup

To operate the EVM to full power, follow the guidelines below for initial setup:

  • Set the LV-E-Load to Constant Current (CC) of 62A
  • Set the LV-PS voltage at 12V, and the current limit at 63A
  • Set the HV-E-Load to CC of 14A
  • Set the HV-PS voltage at 48V, and the current limit at 15A