SLUSA12G December   2009  – November 2022 UCC28C40-Q1 , UCC28C41-Q1 , UCC28C42-Q1 , UCC28C43-Q1 , UCC28C44-Q1 , UCC28C45-Q1

PRODUCTION DATA  

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
   6. 7.6 Typical Characteristics
8. 8 Detailed Description
   1. 8.1 Overview
   2. 8.2 Functional Block Diagram
   3. 8.3 Feature Description
      1. 8.3.1  Detailed Pin Description
         1. 8.3.1.1 COMP
         2. 8.3.1.2 FB
         3. 8.3.1.3 CS
         4. 8.3.1.4 RT/CT
         5. 8.3.1.5 GND
         6. 8.3.1.6 OUT
         7. 8.3.1.7 VDD
         8. 8.3.1.8 VREF
      2. 8.3.2  Undervoltage Lockout
      3. 8.3.3  ±1% Internal Reference Voltage
      4. 8.3.4  Current Sense and Overcurrent Limit
      5. 8.3.5  Reduced-Discharge Current Variation
      6. 8.3.6  Oscillator Synchronization
      7. 8.3.7  Soft Start
      8. 8.3.8  Enable and Disable
      9. 8.3.9  Slope Compensation
      10. 8.3.10 Voltage Mode
   4. 8.4 Device Functional Modes
      1. 8.4.1 Normal Operation
      2. 8.4.2 UVLO 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  Custom Design With WEBENCH? Tools
         2. 9.2.2.2  Input Bulk Capacitor and Minimum Bulk Voltage
         3. 9.2.2.3  Transformer Turns Ratio and Maximum Duty CycleG
         4. 9.2.2.4  Transformer Inductance and Peak Currents
         5. 9.2.2.5  Output Capacitor
         6. 9.2.2.6  Current Sensing Network
         7. 9.2.2.7  Gate Drive Resistor
         8. 9.2.2.8  VREF Capacitor
         9. 9.2.2.9  RT/CT
         10. 9.2.2.10 Start-Up Circuit
         11. 9.2.2.11 Voltage Feedback Compensation
             1. 9.2.2.11.1 Power Stage Poles and Zeroes
             2. 9.2.2.11.2 Slope Compensation
             3. 9.2.2.11.3 Open-Loop Gain
             4. 9.2.2.11.4 Compensation Loop
      3. 9.2.3 Application Curves
      4. 9.2.4 Power Supply Recommendations
      5. 9.2.5 Layout
         1. 9.2.5.1 Layout Guidelines
            1. 9.2.5.1.1 Precautions
            2. 9.2.5.1.2 Feedback Traces
            3. 9.2.5.1.3 Bypass Capacitors
            4. 9.2.5.1.4 Compensation Components
            5. 9.2.5.1.5 Traces and Ground Planes
         2. 9.2.5.2 Layout Example
10. 10Device and Documentation Support
    1. 10.1 Device Support
       1. 10.1.1 Development Support
          1. 10.1.1.1 Custom Design With WEBENCH? Tools
    2. 10.2 Documentation Support
       1. 10.2.1 Related Documentation
    3. 10.3 Related Links
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
11. 11Mechanical, Packaging, and Orderable Information