SNVS703H February   2011  – November 2014 LM5046

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 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 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  Line Undervoltage Detector
      3. 7.3.3  Overvoltage Protection
      4. 7.3.4  Reference
      5. 7.3.5  Oscillator, Sync Input
      6. 7.3.6  Cycle-by-Cycle Current Limit
      7. 7.3.7  Hiccup Mode
      8. 7.3.8  PWM Comparator
      9. 7.3.9  RAMP Pin
      10. 7.3.10 Slope Pin
      11. 7.3.11 Soft-Start
      12. 7.3.12 Gate Driver Outputs
      13. 7.3.13 Synchronous Rectifier Control Outputs (SR1 & SR2)
      14. 7.3.14 Soft-Start of the Synchronous Rectifiers
      15. 7.3.15 Pre-Bias Startup
      16. 7.3.16 Soft-Stop
      17. 7.3.17 Soft-Stop Off
      18. 7.3.18 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Control Method Selection
      2. 7.4.2 Voltage Mode Control Using the LM5045
      3. 7.4.3 Current Mode Control Using the LM5045
  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  Phase-Shifted Full-Bridge Operation
          1. 8.2.2.1.1 Operating State 1 (Power Transfer/Active Mode)
          2. 8.2.2.1.2 Operating State 2 (Active to Passive Transition)
          3. 8.2.2.1.3 Operating State 3 (Freewheel/Passive Mode)
          4. 8.2.2.1.4 Operating State 4 (Passive to Active Transition)
        2. 8.2.2.2  Control Method Selection
        3. 8.2.2.3  Voltage Mode Control Using the LM5046
        4. 8.2.2.4  Current Mode Control Using the LM5046
        5. 8.2.2.5  VIN and VCC
        6. 8.2.2.6  For Applications With > 100 V Input
        7. 8.2.2.7  UVLO and OVP Voltage Divider Selection
        8. 8.2.2.8  Current Sense
        9. 8.2.2.9  Hiccup Mode Current Limit Restart
        10. 8.2.2.10 Augmenting the Gate Drive Strength
      3. 8.2.3 Application Curve
  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 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

9 Power Supply Recommendations

The LM5046 can be used to control power levels up to 1kW. Therefore the current levels can be considerable. Care should be taken that components with the correct current rating are chosen. This would include magnetic components, power MOSFETS and diodes, connectors and wire sizes. Input and output capacitors should have the correct ripple current rating. The use of a multilayer PCB is recommended with a copper area chosen to ensure the LM5046 is operating below its maximum junction temperature. Full power loading should never be attempted without providing adequate cooling.