ZHCSNV7A March   2020  – December 2021 TPS62816-Q1

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
  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
      2. 9.3.2 COMP/FSET
      3. 9.3.3 MODE/SYNC
      4. 9.3.4 Spread Spectrum Clocking (SSC)
      5. 9.3.5 Undervoltage Lockout (UVLO)
      6. 9.3.6 Power Good Output (PG)
      7. 9.3.7 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)
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Programming the Output Voltage
      2. 10.1.2 External Component Selection
        1. 10.1.2.1 Inductor Selection
        2. 10.1.2.2 Capacitor Selection
          1. 10.1.2.2.1 Input Capacitor
          2. 10.1.2.2.2 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
      3. 10.3.3 Compensation Settings
  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 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 接收文档更新通知
    4. 13.4 支持资源
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 术语表
  14. 14Mechanical, Packaging, and Orderable Information

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10.3.3 Compensation Settings

The TPS62816-Q1 offers two different compensations settings using the COMP/FSET pin. This allows the user to optimize the device regarding its transient response. For applications with no high requirements on transient response, a small output capacitance is desired for small size and low cost. In such cases, COMP1 must used so the TPS62816-Q1 is stable with as low as 32 μF of output capacitance. When the load is very dynamic, adding output capacitance improves transient response, but its effect is limited since this also reduces the cross-over frequency of the control loop. For such cases, COMP2 must be used as it increases the bandwidth, but requires a larger output capacitance for stable operation. The following scope plots are taken for the same conditions, but differ in the compensation setting. Since COMP2 demands 72-μF minimum output capacitance for stability, both plots were both taken with 72 μF on the output to allow the user to compare the results. One plot was taken for the COMP1 (RCF = 8.06 kΩ) and one for the COMP2 (RCF = 80.6 kΩ) compensation setting. The scope plots show that for the same output capacitance of 72 μF, the transient response for COMP2 is improved over the COMP1 setting.

Figure 10-62 Schematic
VIN = 5 V RCF = 8.06 kΩ COUT = 72 μF
VOUT = 1.8 V IOUT = 0.6 A to 5.4 A to 0.6 A
Figure 10-63 Load Transient Response with Setting COMP1
VIN = 5 V RCF = 80.6 kΩ COUT = 72 μF
VOUT = 1.8 V IOUT = 0.6 A to 5.4 A to 0.6 A
Figure 10-64 Load Transient Response with Setting COMP2