SNVS344B March   2005  – December 2014 LM5032

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 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  Line Undervoltage Lock Out, UVLO, Shutdown
      2. 7.3.2  Startup Regulator, VIN, VCC
      3. 7.3.3  Drivers Off, VCC Disable
      4. 7.3.4  Oscillator
      5. 7.3.5  PWM Comparator/Slope Compensation
      6. 7.3.6  Cycle-by-Cycle Current Limit
      7. 7.3.7  Hiccup Mode Current Limit Restart
      8. 7.3.8  Soft-Start
      9. 7.3.9  Output Duty Cycle
      10. 7.3.10 Driver Outputs
      11. 7.3.11 Thermal Shutdown
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1  VIN
      2. 8.1.2  For Applications > 100 V
      3. 8.1.3  UVLO
      4. 8.1.4  VCC
      5. 8.1.5  Oscillator, Sync Input
      6. 8.1.6  Voltage Feedback, COMP1, COMP2
      7. 8.1.7  Current Sense, CS1, CS2
      8. 8.1.8  Hiccup Mode Current Limit Restart
      9. 8.1.9  Soft-Start
      10. 8.1.10 Line Voltage Dependent Maximum Duty Cycle
      11. 8.1.11 User Defined Max Duty Cycle
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Oscillator Frequency and Maximum Duty Cycle
        2. 8.2.2.2 Power Stage Design
          1. 8.2.2.2.1 Boost Inductor Selection
          2. 8.2.2.2.2 Output Capacitor Selection
          3. 8.2.2.2.3 Boost MOSFET Selection
          4. 8.2.2.2.4 Boost Diode Selection
        3. 8.2.2.3 UVLO Setting
        4. 8.2.2.4 VIN, VCC, Startup
        5. 8.2.2.5 Soft-Start and Overload
        6. 8.2.2.6 Current Sense
      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 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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9 Power Supply Recommendations

The VCC pin requires a local decoupling capacitor to ground for stability of the internal regulator from the VIN pin. This decoupling capacitor also provides the current pulses to drive the gates of the external MOSFETs through the driver output pins. The decoupling capacitor should be placed close to the VCC and GND1/GNS2 pins, and should be tracked directly to the pins.

The two ground pins (GND1 and GND2) must be connected together with a short direct connection.