ZHCSJG2A March   2019  – September 2019 TPS7A78

PRODUCTION DATA.  

  1. 特性
  2. 应用
  3. 说明
    1.     Device Images
      1.      半桥配置典型原理图
      2.      全桥配置典型原理图
  4. 修订历史记录
  5. Pin Configuration and Functions
    1.     Pin Functions
  6. 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
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Active Bridge Control
      2. 7.3.2 Full-Bridge (FB) and Half-Bridge (HB) Configurations
      3. 7.3.3 4:1 Switched-Capacitor Voltage Reduction
      4. 7.3.4 Undervoltage Lockout Circuits (VUVLO_SCIN) and (VUVLO_LDO_IN)
      5. 7.3.5 Dropout Voltage Regulation
      6. 7.3.6 Current Limit
      7. 7.3.7 Programmable Power-Fail Detection
      8. 7.3.8 Power-Good (PG) Detection
      9. 7.3.9 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Dropout Mode
      3. 7.4.3 Disabled Mode
  8. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Recommended Capacitor Types
      2. 8.1.2 Input and Output Capacitors Requirements
      3. 8.1.3 Startup Behavior
      4. 8.1.4 Load Transient
      5. 8.1.5 Standby Power and Output Efficiency
      6. 8.1.6 Reverse Current
      7. 8.1.7 Switched-Capacitor Stage Output Impedance
      8. 8.1.8 Power Dissipation (PD)
      9. 8.1.9 Estimating Junction Temperature
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Calculating the Cap-Drop Capacitor CS
          1. 8.2.2.1.1 CS Calculations for the Typical Design
        2. 8.2.2.2 Calculating the Surge Resistor RS
          1. 8.2.2.2.1 RS Calculations for the Typical Design
        3. 8.2.2.3 Checking for the Device Maximum ISHUNT Current
          1. 8.2.2.3.1 ISHUNT Calculations for the Typical Design
        4. 8.2.2.4 Calculating the Bulk Capacitor CSCIN
          1. 8.2.2.4.1 CSCIN Calculations for the Typical Design
        5. 8.2.2.5 Calculating the PFD Pin Resistor Dividers for a Power-Fail Detection
          1. 8.2.2.5.1 PFD Pin Resistor Divider Calculations for the Typical Design
        6. 8.2.2.6 Summary of the Typical Application Design Components
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 开发支持
        1. 11.1.1.1 评估模块
        2. 11.1.1.2 SIMPLIS 模型
      2. 11.1.2 器件命名规则
    2. 11.2 文档支持
      1. 11.2.1 相关文档
    3. 11.3 接收文档更新通知
    4. 11.4 社区资源
    5. 11.5 商标
    6. 11.6 静电放电警告
    7. 11.7 Glossary
  12. 12机械、封装和可订购信息

说明

TPS7A78 提高了电源的整体效率并改进了待机功耗,实现了简单易用的非磁性交流/直流转换方案。TPS7A78 采用了电容降压架构,可在主动钳制整流电压前降低交流电源电压。该器件还可将此整流电压降至应用特定的工作电压。由于器件采用独特的架构,因而可将待机功耗降至仅几十毫瓦。TPS7A78 开关电容器级按照 PIN ≅ POUT 以及 VIN ≅ VOUT × 4 将整流输入电压降低至原来的四分之一,并以相同的比例提升输出到输入电流,从而降低功率损耗。相较于传统的电容压降级,此类降压能减小输入电流,从而最大限度降低所需的电容值。

电量计量 应用中的电源必须可靠且可防范磁篡改,由于 TPS7A78 无需外部磁体,因此采用该器件可为此类应用带来优势。借助此特性,您可以更轻松地达到 IEC 61000-4-8 标准,同时最大限度地降低磁屏蔽成本。

此外,TPS7A78 还具有用户可编程的电源故障检测阈值,可对电源故障进行早期预警,并可在系统完全断电之前执行关断。器件还配备了电源正常指示器 (PG),可用于定序或对微控制器进行复位。

TPS7A78 采用 14 引脚 HTSSOP (PWP) 封装。

器件信息(1)

器件型号 封装 封装尺寸(标称值)
TPS7A78 HTSSOP (14) 5.00mm × 6.50mm
  1. 如需了解所有可用封装,请参阅数据表末尾的可订购米6体育平台手机版_好二三四附录。