SLVUCY3A October   2024  – December 2024 LM65680-Q1

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 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, Load Regulation, and Efficiency
  8. 3Implementation Results
    1. 3.1 Performance Data and Results
      1. 3.1.1 EVM Characteristics
      2. 3.1.2 Conversion Efficiency
      3. 3.1.3 Operating Waveforms
        1. 3.1.3.1 Switching
        2. 3.1.3.2 Load Transient Response
        3. 3.1.3.3 Short-Circuit Recovery
        4. 3.1.3.4 Start-Up and Shutdown With EN
        5. 3.1.3.5 Start-Up With VIN
      4. 3.1.4 Bode Plot
      5. 3.1.5 CISPR 25 EMI Performance
      6. 3.1.6 Thermal Performance
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
      1. 4.2.1 Component Drawings
      2. 4.2.2 Multi-Layer Stackup
    3. 4.3 Bill of Materials
  10. 5Compliance Information
    1. 5.1 Compliance and Certifications
  11. 6Related Documentation
    1. 6.1 Supplemental Content
      1. 6.1.1 Development Support
      2. 6.1.2 PCB Layout Resources
      3. 6.1.3 Thermal Design Resources
  12. 7Additional Information
    1. 7.1 Trademarks
  13. 8Revision History

3.1.1 EVM Characteristics

The electrical characteristics for LM65680-Q1EVM are shown in Table 3-1.

Table 3-1 Electrical Performance Characteristics of EVM
ParameterTest ConditionsMINTYPMAXUnit
INPUT CHARACTERISTICS
Input voltage range, VINOperating82470V
Input current, no load, IIN-NLIOUT = 0A,
MODE/SYNC pin tied to GND		VIN = 12V29μA
VIN = 24V 18
VIN = 48V15
VIN = 65V15.5
Input voltage turn-on, VIN(ON) Adjusted using EN divide resistors 5.81 V
Input voltage turn-off, VIN(OFF) 4.73 V
Input voltage hysteresis, VIN(HYS) 1.08 V
Input current, shutdown, IIN-OFFVEN = 0V, VIN = 48V, with 187kΩ and 49.9kΩ EN divider357μA
OUTPUT CHARACTERISTICS
Output voltage, VOUT (1)4.9555.05V
Output current, IOUTVIN = 8V to 65V, Airflow = 100 LFM (2)08A
Output voltage regulation, ΔVOUTLoad regulationIOUT = 0A to 8A0.1%
Line regulationVIN = 8V to 65V1%
Output voltage ripple, VOUT-ACVIN = 48V, IOUT = 8A35mVrms
Output overcurrent protection, IOCPVIN = 48V8.5A
Soft-start time, tSS5.3ms
SYSTEM CHARACTERISTICS
Switching frequency, FSW-nomVIN = 48V400kHz
PFM Light-load efficiency, ηLIGHT (1) IOUT = 1A VIN = 12V 94.3%
VIN = 24V90.9%
VIN = 48V85.3%
VIN = 65V79.7%
Half-load efficiency, ηHALF IOUT = 4A VIN = 12V 95.2%
VIN = 24V94%
VIN = 48V91.6%
VIN = 65V89.7%
Full load efficiency, ηFULL IOUT = 8A VIN = 12V 91.7
VIN = 24V91.5%
VIN = 48V90%
VIN = 65V88.8%
LM65680-Q1 junction temperature, TJ–40150°C
(1) The default output voltage of this EVM is 5V. 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 65V is 100 LFM.