SNVSA02A January   2016  – December 2016

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  High Voltage Start-up Regulator
      2. 7.3.2  VCC Regulator
      3. 7.3.3  Oscillator
      4. 7.3.4  SYNIN and SYNOUT
      5. 7.3.5  Enable
      6. 7.3.6  Power Good
      7. 7.3.7  Output Voltage
      8. 7.3.8  Minimum Output Voltage Adjustment
      9. 7.3.9  Current Sense
      10. 7.3.10 DCR Current Sensing
      11. 7.3.11 Error Amplifier and PWM Comparator
      12. 7.3.12 Slope Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Hiccup Mode Current Limiting
      2. 7.4.2 Standby Mode
      3. 7.4.3 Soft Start
      4. 7.4.4 Diode Emulation
      5. 7.4.5 High and low-side Drivers
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Inductor Calculation
        2. 8.2.2.2  Current Sense Resistor
        3. 8.2.2.3  Output Capacitor
        4. 8.2.2.4  Input Filter
        5. 8.2.2.5  EMI Filter Design
        6. 8.2.2.6  MOSFET Selection
        7. 8.2.2.7  Driver Slew Rate Control
        8. 8.2.2.8  Sub-Harmonic Oscillation
        9. 8.2.2.9  Control Loop
        10. 8.2.2.10 Error Amplifier
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

9 Power Supply Recommendations

The LM5140EVM was designed to operate over an input voltage supply range between 3.8 V and 42 V. This input supply must be well regulated. If the power source is placed more than a few inches from the LM5140-Q1 EVM, additional bulk capacitance and ceramic bypass capacitors may be required at the power supply input. An electrolytic capacitor with a value of 47 µF is typically a good choice.
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