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

2.3 Test Equipment

Power Supplies: HV-PS needs to be capable of 80V/20A, and LV-PS 40V/80A. To operate 2 EVMs in 4 phase configuration, double the capabilities of the HV-PS and LV-PS. High inrush current (Up to 80A) can be seen at startup, increase the current limit of the power supply if the EVM fails to startup. Bench power supplies to generate UVLO, ISETA, DIR, and EN1 and EN2 signals need to be capable of 5V/0.1A.

Electronic Loads: The HV-E-Load needs to be capable of 80V/20A, and LV-E-Load 40V/80A. To operate 2 EVMs in 4 phase configuration, double the capability of the E-Load.

Meters: Because most current meters are rated only to 10A, shunts are recommended to measure the current using a DVM.

Oscilloscope: An oscilloscope and 10x probes with at least 20MHz bandwidth is required. Current probe capable of 50A is required to monitor the inductor current via a wire loop inserted to the non-switching side of the inductor.