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

4 修订历史记录

Changes from D Revision (April 2013) to E Revision

  • Added 引脚配置和功能部分，ESD 额定值表，特性 描述 部分、器件功能模式、应用和实施部分、电源相关建议部分、布局部分、器件和文档支持部分以及机械、封装和可订购信息部分Go

Changes from C Revision (April, 2013) to D Revision

Changes from B Revision (March 2013) to C Revision

  • Changed Operating junction temperature range from (-40 to 125) to (125 to 150).Go
  • Added UCC28251PW Current Sense data.Go
  • Changed Functional Block DiagramGo

Changes from A Revision (February 2013) to B Revision

  • Added Start threshold electical characteristics.Go
  • Added Input offset electrical characteristics.Go
  • Added Primary off to secondary on dead time electrical characteristics.Go
  • Added Secondary off to primary on dead time electrical characteristics.Go
  • Added note, "The minimum value for RPS/RSP is 5 kΩ and the maximum value is 250 kΩ." in two places.Go

Changes from * Revision (February 2013) to A Revision

  • Added Figure 24, Oscillator Frequency FOSC vs External Resistance of RT at TD(ps) = 40 ns and 100 nsGo