SNVSBZ3 June   2021 LM5168-Q1

ADVANCE INFORMATION  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Control Architecture
      2. 8.3.2  Internal VCC Regulator and Bootstrap Capacitor
      3. 8.3.3  Internal Soft Start
      4. 8.3.4  On-Time Generator
      5. 8.3.5  Current Limit
      6. 8.3.6  N-Channel Buck Switch and Driver
      7. 8.3.7  Synchronous Rectifier
      8. 8.3.8  Enable/Undervoltage Lockout (EN/UVLO)
      9. 8.3.9  Power Good (PGOOD)
      10. 8.3.10 Thermal Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Active Mode
      3. 8.4.3 Sleep Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1  Switching Frequency (RT)
        2. 9.2.2.2  Transformer Selection
        3. 9.2.2.3  Output Capacitor Selection
        4. 9.2.2.4  Secondary Output Diode
        5. 9.2.2.5  Regulation Comparator
        6. 9.2.2.6  Input Capacitor
        7. 9.2.2.7  Type-3 Ripple Network
        8. 9.2.2.8  Minimum Secondary Output Load
        9. 9.2.2.9  Example Design Summary
        10. 9.2.2.10 Thermal Considerations
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Compact PCB Layout for EMI Reduction
      2. 11.1.2 Feedback Resistors
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.2.3 Application Curves

The curves in this section we taken on the LM5169FQEVM. Unless otherwise specified the following conditions apply: VIN = 24 V, TA = 25°C. For a detailed schematic and BOM, see the LM5169FQEVM User's Guide.

VOUT1 = VOUT2 = 10 V IOUT1 = IOUT2 FSW = 750 kHz
Primary DCR = 0.62A
Figure 9-3 Efficiency
VIN = 24 V IOUT1 =0.3 A
Figure 9-5 Load Regulation vs Secondary Load Current
VIN = 24 V IOUT1 = IOUT2 = 10 mA
Figure 9-7 Light Load Start-Up from EN
VIN = 24 V IOUT2 = 10 mA
Figure 9-9 Load Transient on Primary Output
VIN = 24 V IOUT2 = 10 mA
Figure 9-11 Short Circuit on Primary Output
VIN = 24 V IOUT = IOUT2 = 0.2 A
Figure 9-13 Typical Switching Waveforms
 
 
VIN = 24 V IOUT2 = 10 mA
Figure 9-4 Load Regulation vs Primary Load Current
VIN = 24 V IOUT1 = IOUT2 = 0.3 A
Figure 9-6 Line Regulation
VIN = 24 V IOUT1 = IOUT2 = 10 mA
Figure 9-8 Full Load Start-Up from EN
VIN = 24 V IOUT1 = 10 mA
Figure 9-10 Load Transient on Secondary Output
VIN = 24 V IOUT1 = 0.3 A
Figure 9-12 Short Circuit on Secondary Output
VIN = 24 V IOUT = IOUT2 = 0.2 A
Figure 9-14 Typical Output Ripple