ZHCSLS6B August   2020  – June 2022 TPS628510 , TPS628511 , TPS628512 , TPS628513

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Device Comparison Table
  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 Parameter Measurement Information
    1. 8.1 Schematic
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Precise Enable (EN)
      2. 9.3.2 MODE / SYNC
      3. 9.3.3 Spread Spectrum Clocking (SSC)
      4. 9.3.4 Undervoltage Lockout (UVLO)
      5. 9.3.5 Power Good Output (PG)
      6. 9.3.6 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Pulse Width Modulation (PWM) Operation
      2. 9.4.2 Power Save Mode Operation (PWM/PFM)
      3. 9.4.3 100% Duty-Cycle Operation
      4. 9.4.4 Current Limit and Short Circuit Protection
      5. 9.4.5 Foldback Current Limit and Short Circuit Protection
      6. 9.4.6 Output Discharge
      7. 9.4.7 Soft Start / Tracking (SS/TR)
      8. 9.4.8 Input Overvoltage Protection
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Programming the Output Voltage
      2. 10.1.2 Inductor Selection
      3. 10.1.3 Capacitor Selection
        1. 10.1.3.1 Input Capacitor
        2. 10.1.3.2 Output Capacitor
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 Voltage Tracking
      2. 10.3.2 Synchronizing to an External Clock
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 第三方产品免责声明
    2. 13.2 接收文档更新通知
    3. 13.3 支持资源
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 术语表
  14. 14Mechanical, Packaging, and Orderable Information

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10.3.2 Synchronizing to an External Clock

The TPS62851x can be externally synchronized by applying an external clock on the MODE/SYNC pin. There is no need for any additional circuitry as long as the input signal meets the requirements given in the electrical specifications. The clock can be applied / removed during operation, allowing you to switch from an externally defined fixed frequency to power-save mode or to internal fixed frequency operation.

GUID-B3DFCF6D-B29D-4D89-9840-C65A80769246-low.gifFigure 10-59 Schematic using External Synchronization
GUID-20200811-CA0I-ZQBW-PBHD-HLJFZGZPKPSW-low.gif
VIN = 5 VRCF = 8.06 kΩIOUT = 0.1 A
VOUT = 1.8 VfEXT = 2.5 MHz
Figure 10-60 Switching from External Syncronization to Power-Save Mode (PFM)
GUID-20200811-CA0I-MSWZ-MZWP-XQ3MDM4RXLPZ-low.gif
VIN = 5 VRCF = 8.06 kΩIOUT = 0.1 A
VOUT = 1.8 VfEXT = 2.5 MHz
Figure 10-61 Switching from External Synchronizaion to Internal Fixed Frequency