ZHCSHQ2B November   2017  – May 2018 TPS62821 , TPS62822 , TPS62823

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      典型应用电路原理图 空白 空白 空白 空白
      2.      效率与输出电流间的关系 空白
  4. 4 修订历史记录
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin 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
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Enable / Shutdown and Output Discharge
      2. 8.3.2 Soft-Start
      3. 8.3.3 Power Good (PG)
      4. 8.3.4 Undervoltage Lockout (UVLO)
      5. 8.3.5 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Pulse Width Modulation (PWM) Operation
      2. 8.4.2 Power Save Mode (PSM) Operation
      3. 8.4.3 Minimum Duty Cycle and 100% Mode Operation
      4. 8.4.4 Current Limit and Short Circuit Protection
  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 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Setting the Adjustable Output Voltage
        3. 9.2.2.3 Output Filter Selection
        4. 9.2.2.4 Inductor Selection
        5. 9.2.2.5 Output Capacitor Selection
        6. 9.2.2.6 Input Capacitor Selection
        7. 9.2.2.7 Feed-forward Capacitor Selection
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 器件支持
      1. 12.1.1 第三方产品免责声明
    2. 12.2 相关链接
    3. 12.3 接收文档更新通知
    4. 12.4 社区资源
    5. 12.5 商标
    6. 12.6 静电放电警告
    7. 12.7 术语表
  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

8.3.3 Power Good (PG)

The TPS6282x has a built in power good (PG) function. The PG pin goes high impedance, when the output voltage has reached its nominal value. Otherwise, including when disabled, in UVLO or in thermal shutdown, PG is Low (see Table 1). The PG function is formed with a window comparator, which has an upper and lower voltage threshold (see Electrical Characteristics). The PG pin is an open drain output that requires a pull-up resistor and can sink up to 1mA. If not used, the PG pin can be left floating or connected to GND.

Table 1. Power Good Pin Logic

Device State PG Logic Status
High Impedance Low
Enable (EN=High) VFB ≥ VPGTL and VFB ≤ VPGTH √
VFB ≤ VPGTL or VFB ≥ VPGTH √
Shutdown (EN=Low) √
UVLO 0.7 V < VIN < VUVLO √
Thermal Shutdown TJ > TSD √
Power Supply Removal VIN < 0.7 V √

At startup, PG transitions from low to floating about 100µs after the output voltage has reached regulation. Once in operation, PG has a deglitch delay of about 20µs before going low. When the output voltage returns to regulation, the same 100µs delay occurs.