ZHCSE71I september   2015  – august 2023 SN6505A , SN6505B

PRODUCTION DATA  

  1.   1
  2. 特性
  3. 应用
  4. 说明
  5. Revision History
  6. Pin Configuration and Functions
  7. 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 Timing Requirements
    7. 6.7 Typical Characteristics, SN6505A
    8. 6.8 Typical Characteristics, SN6505B
  8. Parameter Measurement Information
  9. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Push-Pull Converter
      2. 8.3.2 Core Magnetization
    4. 8.4 Device Functional Modes
      1. 8.4.1 Start-Up Mode
        1. 8.4.1.1 Soft-Start
      2. 8.4.2 Operating Mode
      3. 8.4.3 Shutdown-Mode
      4. 8.4.4 Spread Spectrum Clocking
      5. 8.4.5 External Clock Mode
  10. 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 Drive Capability
        2. 9.2.2.2 LDO Selection
        3. 9.2.2.3 Diode Selection
        4. 9.2.2.4 Capacitor Selection
        5. 9.2.2.5 Transformer Selection
          1. 9.2.2.5.1 V-t Product Calculation
          2. 9.2.2.5.2 Turns Ratio Estimate
          3. 9.2.2.5.3 Recommended Transformers
      3. 9.2.3 Application Curves
      4. 9.2.4 System Examples
        1. 9.2.4.1 Higher Output Voltage Designs
        2. 9.2.4.2 Application Circuits
  11. 10Power Supply Recommendations
  12. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  13. 12Device and Documentation Support
    1. 12.1 Device Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Related Links
    4. 12.4 Receiving Notification of Documentation Updates
    5. 12.5 Community Resources
    6. 12.6 Trademarks
  14. 13Mechanical, Packaging, and Orderable Information

说明

SN6505x 是一款低噪声、低 EMI 的推挽式变压器驱动器,专为小型隔离式电源而设计。该器件通过 2.25V 至 5V 的直流电源来驱动薄型、
中间抽头的变压器。通过输出开关电压的转换速率控制和扩频时钟 (SSC) 可实现超低噪声和 EMI。SN6505x 包含一个振荡器,然后是一个栅极驱动器电路,此电路提供补偿输出信号以驱动接地参考 N 通道电源开关。该器件包含两个 1A 电源 MOSFET 开关,以确保在重负载条件下正常启动。开关时钟也可由外部提供,以准确放置开关谐波或者在与多个变压器驱动器搭配工作时。内部保护特性包括 1.7A 限流、欠压锁定、热关断和先断后合电路。SN6505x 具有软启动功能,可防止大负载电容器在上电过程中出现高浪涌电流。SN6505A 有 160kHz 内部振荡器,适用于需要大幅降低辐射的应用;而 SN6505B 有 420kHz 内部振荡,适用于需要更高效率和更小变压器尺寸的应用。SN6505x 采用小型 6 引脚 SOT23/DBV 封装。该器件的运行温度范围为 –55°C 至 125°C。

器件信息
器件型号 封装 封装尺寸(标称值)
SN6505A SOT23(6 引脚) 2.90mm × 1.60mm
SN6505B
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