SNVU820 February   2022 LM5149-Q1

 

  1.   Trademarks
  2. 1High Density EVM Description
    1. 1.1 Typical Applications
    2. 1.2 Features and Electrical Performance
  3. 2EVM Characteristics
  4. 3Application Circuit Diagram
  5. 4EVM Photo
  6. 5Test Setup and Procedure
    1. 5.1 EVM Connections
    2. 5.2 Test Equipment
    3. 5.3 Recommended Test Setup
      1. 5.3.1 Input Connections
      2. 5.3.2 Output Connections
    4. 5.4 Test Procedure
      1. 5.4.1 Line and Load Regulation, Efficiency
  7. 6Test Data and Performance Curves
    1. 6.1 Conversion Efficiency
    2. 6.2 Operating Waveforms
      1. 6.2.1 Switching
      2. 6.2.2 Load Transient Response
      3. 6.2.3 Line Transient Response
      4. 6.2.4 Start-Up and Shutdown With EN
      5. 6.2.5 Start-Up and Shutdown with VIN
    3. 6.3 Bode Plot
    4. 6.4 CISPR 25 EMI Performance
    5. 6.5 Thermal Performance
  8. 7EVM Documentation
    1. 7.1 Schematic
    2. 7.2 List of Materials
    3. 7.3 PCB Layout
    4. 7.4 Component Drawings
  9. 8Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
        1. 8.2.1.1 PCB Layout Resources
        2. 8.2.1.2 Thermal Design Resources

2 EVM Characteristics

Table 2-1 lists the electrical characteristics.

Table 2-1 Electrical Performance Characteristics
ParameterTest ConditionsMINTYPMAXUnit
INPUT CHARACTERISTICS
Input voltage range, VINOperating154872V
Input current, no load, IIN-NLIOUT = 0 A, PFM tied to VDDA, UVLO removedVIN = 24 V84µA
VIN = 48 V55
VIN = 72 V46
Input current, shutdown, IIN-OFFVEN = 0 VVIN = 48 V3µA
OUTPUT CHARACTERISTICS
Output voltage, VOUT(1)11.881212.12V
Output current, IOUTVIN = 15 V to 72 V, Airflow = 100 LFM(2)08A
Output voltage regulation, ΔVOUTLoad regulationIOUT = 0 A to 8 A0.1%
Line regulationVIN = 15 V to 72 V1%
Output voltage ripple, VOUT-ACVIN = 48 V, IOUT = 8 A12mVrms
Output overcurrent protection, IOCPVIN = 48 V10A
Soft-start time, tSS3ms
SYSTEM CHARACTERISTICS
Switching frequency, FSW-nomVIN = 48 V400kHz
PFM Light-load efficiency, ηLIGHT(1) IOUT = 1 A VIN = 24 V 94.8%
VIN = 48 V 90.5%
VIN = 60 V 89.1%
Half-load efficiency, ηHALFIOUT = 4 AVIN = 24 V97.0%
VIN = 48 V95.1%
VIN = 60 V94.1%
Full load efficiency, ηFULLIOUT = 8 AVIN = 24 V96.2%
VIN = 48 V95.4%
VIN = 60 V94.9%
LM5149-Q1 junction temperature, TJ–40150°C
(1) The default output voltage of this EVM is 12 V. Efficiency and other performance metrics can change based on operating input voltage, load currents, externally-connected output capacitors, and other parameters.
(2) The recommended airflow when operating at input voltages greater than 60 V is 100 LFM.