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

2.4.1 Buck Mode with Voltage Regulation

Jumper Settings in Buck Mode with Voltage Regulation shows the jumper settings of buck mode with voltage regulation. This is the default jumper setting of the EVM.

LM5171-Q1 Jumper Settings in Buck Mode with Voltage Regulation Figure 2-4 Jumper Settings in Buck Mode with Voltage Regulation

The status of the EVM is as follows:

  • UVLO: 48V via J1
  • Phase interleaving angle: 180° via J6
  • DIR: Buck mode via J28
  • EN1: Enable via J29
  • CFG: I2C address set to 0x20 & inductor current monitor via J34
  • Voltage loop: Closed via J36
  • IMON1: Filter connected via J2
  • IMON2: Filter connected via J7
  • SS/DEM1: DEM mode via J4
  • SS/DEM1: DEM mode via J5
  • SS/DEM2 connected to SS/DEM1 via J15
  • EN2: Select EN2=EN1 via J24
  • VCC supply: Select onboard bias power via J38
  • Onboard bias power: Enabled via J40
  • Onboard bias power input: 48V via J41

Note the load needs to be set to CC mode.