SLUS871D January   2009  – December 2016 UC1846-SP

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  Reference
      2. 7.3.2  Oscillator
      3. 7.3.3  Slope Compensation
      4. 7.3.4  Error Amplifier
      5. 7.3.5  Current Sense Amplifier
      6. 7.3.6  Current Limit
      7. 7.3.7  Shutdown
      8. 7.3.8  Output Section
      9. 7.3.9  Undervoltage Lockout
      10. 7.3.10 Soft-Start
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation With VIN < 8 V (Minimum VIN)
      2. 7.4.2 Synchronization
      3. 7.4.3 Parallel Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Oscillator Circuit Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Input Capacitor Selection
          2. 8.2.1.2.2 Output Capacitor Selection
          3. 8.2.1.2.3 Output Inductor Selection
          4. 8.2.1.2.4 Switching Frequency
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Parallel Operation
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
      3. 8.2.3 Soft-Start and Shutdown/Restart Functions Application
      4. 8.2.4 Open-Loop Test Circuit Application
  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

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9 Power Supply Recommendations

The devices are designed to operate from an input voltage supply range between 8 V and 40 V. This input supply should be well regulated. If the input supply is located more than a few inches from the UC1846-SP converter additional bulk capacitance may be required in addition to the ceramic bypass capacitors. A tantalum capacitor with a value of 47 μF is a typical choice, however this may vary depending upon the output power being delivered.