SNVU843A April   2023  – November 2023

 

  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 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
  7. 4Test Data
    1. 4.1 Efficiency
    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
    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

1 Features and Electrical Performance

The EVM supports the following features and performance capabilities:

  • Input operating voltage ranges
    • The 48VDC-port 6 V to 70 V, in the buck mode
    • The 12VDC-port 6 V to 48 V, in the boost mode
  • Output voltage regulation (with the onboard outer voltage regulation activated)
    • 14.5-V output voltage at the 12VDC-port, in the buck mode
    • 50.5-V output voltage at the 48VDC-port, in the boost mode
  • Operating current
    • 60-Adc maximum from or into the 12VDC-port
    • Typical 1% current regulation accuracy
    • Typical 1% current monitor accuracy
  • Switching frequency:
    • Standalone Fsw = 100 kHz
    • Able to synchronize to an external clock from 80 kHz to 120 kHz
  • Maximum efficiency: >97%
  • OVP threshold
    • 75 V at the 48VDC-port
    • 24 V at the 12VDC-port
  • Other convenient features
    • Optional onboard SEPIC converter providing +10V supply
    • Onboard 5 V bias voltages and 3.5V voltage reference
    • Onboard LM26LV Temperature Sensors Monitoring Local Temperatures of Power MOSFETs, with optional over temperature shutdown and LED indicator
    • LED indicators of buck and boost operating modes
    • Optional channel current shunt AC filters for accurate Digital Voltmeter (DVM) Reading
    • Onboard two stage RC Filter for PWM input to ISET (J33)
    • ISET voltage clamp input (J43)
    • Square wave input for dithering (J14)
    • I2C interface for monitoring and diagnose (J31)
    • Output voltage tracking input (J37)

The electrical performance of the EVM is show in Table 1-1. Figure 2-1 shows the simplified EVM schematic.

Table 1-1 Electrical Performance
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT CHARACTERISTICS
48VDC-Port Buck mode operation (DIR > 2 V) 6 48 70 V
12VDC-Port Boost mode operation (DIR < 1 V) 6 12 48 V
OUTPUT CHARACTERISTICS
Current delivery 12VDC-Port input or output current (dual-channel enabled) 0 60 A
Current regulation accuracy 12VDC-Port current vs ISETA command voltage 1%
Channel current monitor accuracy When onboard IOUT1 and IOUT2 termination filter activated 1%
48VDC-Port Boost mode operation (DIR < 1 V, onboard analog output voltage loop closed) 50.5 V
12VDC-Port Buck mode operation (DIR > 2 V, onboard analog output voltage loop closed) 14.5 V
SYSTEM CHARACTERISTICS
Switching frequency 100 kHz
External clock synchronization 80 120 kHz
Full load efficiency 97%
Junction temperature, TJ –40 150 °C