ZHCSAW2E February   2013  – December 2014 UCC28251

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 说明 （续）
  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
      1. 8.1.1 UCC28251 Enhancements Over the UCC28250
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  VDD (5/12)
      2. 8.3.2  VREF (Reference Generator) (20/7)
      3. 8.3.3  EN (Enable Pin) (18/5)
      4. 8.3.4  RT (Oscillator Frequency Set and Synchronization) (15/2)
      5. 8.3.5  SP (Synchronous Rectifier Turn-Off to Primary Output Turn-On Dead Time Programming) (13/19)
      6. 8.3.6  PS (Primary Output Turn-Off to Synchronous Rectifier Turn-On Dead Time Programming) (11/18)
      7. 8.3.7  RAMP/CS (PWM Ramp Input or Current Sense Input) (16/3)
        1. 8.3.7.1 RAMP: Voltage Mode Control With Feed-Forward Operation
        2. 8.3.7.2 CS: Current Mode Control
      8. 8.3.8  REF/EA+ (1/8)
      9. 8.3.9  FB/EA- (2/9)
      10. 8.3.10 COMP (3/10)
      11. 8.3.11 VSENSE (14/1)
      12. 8.3.12 SS (Soft Start Programming Pin) (13/20)
      13. 8.3.13 ILIM (Current Limit for Cycle-by-Cycle Over-Current Protection) (17/4)
      14. 8.3.14 HICC (10/17)
      15. 8.3.15 OVP/OTP (19/6)
      16. 8.3.16 OUTA (9/16) and OUTB (8/15)
      17. 8.3.17 SRA (7/14) and SRB (6/13)
      18. 8.3.18 GND (4/11)
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Error Amplifier and PWM Generation
      2. 9.1.2 Prebiased Start Up
        1. 9.1.2.1 Secondary-Side Control
        2. 9.1.2.2 Primary-Side Control
      3. 9.1.3 Voltage Mode Control and Input Voltage Feed-Forward
        1. 9.1.3.1 Condition 1
        2. 9.1.3.2 Condition 2
        3. 9.1.3.3 Condition 3
      4. 9.1.4 Peak Current Mode Control
      5. 9.1.5 Cycle-by-Cycle Current Limit and Hiccup Mode Protection
    2. 9.2 Typical Applications
      1. 9.2.1 Circuit Diagram in Design Example
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Step 1: Power Stage Design
          2. 9.2.1.2.2 Step 2: Feedback Loop Design
          3. 9.2.1.2.3 Step 3: Programming The Device
            1. 9.2.1.2.3.1 Step 3-1
            2. 9.2.1.2.3.2 Step 3-2: Determine Ramp Resistance and Capacitance
          4. 9.2.1.2.4 Step 3-3: Determine Soft-Start Capacitance
          5. 9.2.1.2.5 Step 3-4: Determine Dead-Time Resistance
          6. 9.2.1.2.6 Step 3-5: Determine OCP Hiccup Off-Time Capacitance
          7. 9.2.1.2.7 Step 3-6: Determine Primary-Side OVP Resistance
          8. 9.2.1.2.8 Step 3-7: Select Capacitance for VDD and VREF
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Secondary-Side Half-Bridge Controller With Synchronous Rectification
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Protection
  12. 12器件和文档支持
    1. 12.1 文档支持
      1. 12.1.1 相关文档　
    2. 12.2 商标
    3. 12.3 静电放电警告
    4. 12.4 Glossary
  13. 13机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

12 器件和文档支持

12.1 文档支持

12.1.1 相关文档　

相关文档请参见以下部分：

  • 《将 UCC28250 设计为二次侧控制器以控制预偏置条件下的输出导通》，SLAA477
  • 《使用 UCC28250EVM-564》，SLUU441

12.2 商标

All trademarks are the property of their respective owners.

12.3 静电放电警告

esds-image

这些装置包含有限的内置 ESD 保护。 存储或装卸时，应将导线一起截短或将装置放置于导电泡棉中，以防止 MOS 门极遭受静电损伤。

12.4 Glossary

SLYZ022 — TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.