ZHCSR78H July   2000  – November 2022 UCC28C40 , UCC28C41 , UCC28C42 , UCC28C43 , UCC28C44 , UCC28C45 , UCC38C40 , UCC38C41 , UCC38C42 , UCC38C43 , UCC38C44 , UCC38C45

PRODUCTION DATA  

1. 1 特性
2. 2 应用
3. 3 说明
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 建议工作条件
   4. 7.4 Thermal Information
   5. 7.5 电气特性
   6. 7.6 典型特性
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 Timing
      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  Input Bulk Capacitor and Minimum Bulk Voltage
         2. 9.2.2.2  Transformer Turns Ratio and Maximum Duty Cycle
         3. 9.2.2.3  Transformer Inductance and Peak Currents
         4. 9.2.2.4  Output Capacitor
         5. 9.2.2.5  Current Sensing Network
         6. 9.2.2.6  Gate Drive Resistor
         7. 9.2.2.7  VREF Capacitor
         8. 9.2.2.8  RT/CT
         9. 9.2.2.9  Start-Up Circuit
         10. 9.2.2.10 Voltage Feedback Compensation
             1. 9.2.2.10.1 Power Stage Poles and Zeroes
             2. 9.2.2.10.2 Slope Compensation
             3. 9.2.2.10.3 Open-Loop Gain
             4. 9.2.2.10.4 Compensation Loop
      3. 9.2.3 Application Curves
   3. 9.3 Power Supply Recommendations
   4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
         1. 9.4.1.1 Precautions
         2. 9.4.1.2 Feedback Traces
         3. 9.4.1.3 Bypass Capacitors
         4. 9.4.1.4 Compensation Components
         5. 9.4.1.5 Traces and Ground Planes
      2. 9.4.2 Layout Example
10. 10Device and Documentation Support
    1. 10.1 Device Support
       1. 10.1.1 第三方产品免责声明
    2. 10.2 Documentation Support
       1. 10.2.1 Related Documentation
    3. 10.3 接收文档更新通知
    4. 10.4 支持资源
    5. 10.5 Trademarks
    6. 10.6 静电放电警告
    7. 10.7 术语表
11. 11Mechanical, Packaging, and Orderable Information