SNVS699I February   2011  – May 2026 LM5045

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  High-Voltage Start-Up Regulator
      2. 6.3.2  Line Undervoltage Detector
      3. 6.3.3  Overvoltage Protection
      4. 6.3.4  Reference
      5. 6.3.5  Oscillator, Sync Input
      6. 6.3.6  Cycle-by-Cycle Current Limit
      7. 6.3.7  Hiccup Mode
      8. 6.3.8  PWM Comparator
      9. 6.3.9  Ramp Pin
      10. 6.3.10 Slope Pin
      11. 6.3.11 Soft-Start
      12. 6.3.12 Gate Driver Outputs
      13. 6.3.13 Synchronous Rectifier Control Outputs (SR1 and SR2)
      14. 6.3.14 Soft-Start of the Synchronous Rectifiers
      15. 6.3.15 Prebias Startup
      16. 6.3.16 Soft-Stop
      17. 6.3.17 Soft-Stop Off
      18. 6.3.18 Thermal Protection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Control Method Selection
      2. 6.4.2 Voltage Mode Control Using the LM5045
      3. 6.4.3 Current Mode Control Using the LM5045
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 VIN and VCC
        2. 7.2.2.2 For Applications With > 100 VIN
        3. 7.2.2.3 UVLO and OVP Voltage Divider Selection
        4. 7.2.2.4 Current Sense
        5. 7.2.2.5 Hiccup Mode Current Limit Restart
        6. 7.2.2.6 Augmenting the Gate Drive Strength
      3. 7.2.3 Application Curve
  9. 8 Power Supply Recommendations
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

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订购信息

5.1 Absolute Maximum Ratings

MIN(1)MAXUNIT
VIN to GND–0.3105V
HS to GND(2)–5105V
BST1/BST2 to GND–0.3116V
BST1/BST2 to HS1/HS2–0.316V
HO1/HO2 to HS1/HS2(3)–0.3BST1/BST2 + 0.3V
LO1/LO2/SR1/SR2(3)–0.3VCC + 0.3V
VCC to GND–0.316V
REF,SSOFF,RT,OVP,UVLO to GND–0.37V
RAMP–0.37V
COMP–0.3V
COMP Input Current10mA
All other inputs to GND(3)–0.3REF + 0.3V
Junction Temperature150°C
Storage temperature, Tstg–55150°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For ensured specifications and test conditions, see the Section 5.5.
(2) The negative HS voltage must never be more negative than VCC–16 V. For example, if VCC = 12 V, the negative transients at HS must not exceed –4 V.
(3) These pins are output pins and as such should not be connected to an external voltage source. The voltage range listed is the limits the internal circuitry is designed to reliably tolerate in the application circuit.