SNVU891 February   2025 LM25137 , LM25137-Q1 , LM25137F-Q1 , LM5137 , LM5137-Q1 , LM5137F-Q1

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specifications
      1. 1.3.1 Application Circuit Diagrams
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Test Setup and Procedure
      1. 2.1.1 EVM Connections
      2. 2.1.2 Test Equipment
      3. 2.1.3 Recommended Test Setup
        1. 2.1.3.1 Input Connections
        2. 2.1.3.2 Output Connections
      4. 2.1.4 Test Procedure
        1. 2.1.4.1 Line and Load Regulation, Efficiency
  9. 3Implementation Results
    1. 3.1 Test Data and Performance Curves
      1. 3.1.1 Efficiency
      2. 3.1.2 Operating Waveforms
        1. 3.1.2.1 Load Transient Response
        2. 3.1.2.2 Start-Up and Shutdown With VIN
        3. 3.1.2.3 Start-Up and Shutdown With ENABLE ON and OFF
        4. 3.1.2.4 Switching Operation
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
      1. 4.2.1 Component Drawings
      2. 4.2.2 Layout Guidelines
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks
  12. 6Device and Documentation Support
    1. 6.1 Device Support
      1. 6.1.1 Development Support
    2. 6.2 Documentation Support
      1. 6.2.1 Related Documentation
        1. 6.2.1.1 Low-EMI Design Resources
        2. 6.2.1.2 PCB Layout Resources
        3. 6.2.1.3 Thermal Design Resources

1.3 Specifications

The following table lists the EVM specifications. VIN = 48V, unless otherwise indicated.

Table 1-1 Electrical Performance Characteristics
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
INPUT CHARACTERISTICS
Input voltage, VINOperating range (after turn-on)364872V
Input UVLO turn-on threshold, VIN-ONRUV1 = 100kΩ, RUV2 = 2.43kΩ, RUV3 = 4.99kΩ, EN1 jumpered to EN2 on header J442V
Input UVLO turn-off threshold, VIN-OFF36V
Input supply current, no load, FPWM,
IIN-NL(FPWM)-2PH		 IOUT = 0A, PFM/SYNC tied to GNDVIN = 36V58 mA
VIN = 48V56
VIN = 72V51
Input supply current, no load, FPWM,
IIN-NL(FPWM)-1PH		 IOUT = 0A, VEN2 = 0V, PFM/SYNC tied to GNDVIN = 36V29 mA
VIN = 48V28
VIN = 72V25
IC quiescent current in shutdown, IIN-SHDNVEN1 = VEN2 = 0V4µA
OUTPUT CHARACTERISTICS
Output voltage, VOUTFixed output setting (or adjustable output setting with 93.1kΩ and 6.65kΩ feedback divider)(1)11.91212.1V
Output current, IOUTElectrical design current (EDC)20A
Thermal design current (TDC)(2), airflow = 100LFM(3) 20 A
Output voltage regulation in FPWM, ΔVOUTLoad regulationIOUT = 0A to 20A1mV
Line regulationVIN = 36V to 72V1
Output voltage ripple, VOUT-ACIOUT = 20A10mVRMS
Output overcurrent protection, IOUT-OCPRS1 = RS2 = 4mΩ25A
Soft-start time, tSSRSS = 20kΩ4.5ms
Hiccup time, tRES16384 clock cycles41ms
SYSTEM CHARACTERISTICS
Switching frequency, FSWRRT = 57.6kΩ400kHz
Half-load efficiency, ηHALF IOUT = 10AVIN = 36V96.5%
VIN = 48V95.5%
VIN = 60V94.6%
Full-load efficiency, ηFULL IOUT = 20AVIN = 36V96.2%
VIN = 48V95.5%
VIN = 60V95.0%
LM5137F-Q1 junction temperature, TJ–40150°C
(1) The default output voltage of this EVM is 12V. Efficiency and other performance metrics can change based on the operating input voltage, load current, externally-connected output capacitors and other parameters.
(2) EDC and TDC can differ, for example when the application requires short-duration transients to a high current that does not substantially increase the operating temperatures of the power-stage components.
(3) The recommended airflow is 100LFM when operating at full rated load of 20A.