ZHCSCV3A July   2013  – September 2014 TPS65631W

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用范围
  3. 3 说明
  4. 4 简化电路原理图
  5. 5 修订历史记录
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 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 Boost Converter
      2. 8.3.2 Inverting Buck-Boost Converter
      3. 8.3.3 Soft-Start and Start-Up Sequence
      4. 8.3.4 Enable (CTRL)
      5. 8.3.5 Undervoltage Lockout
      6. 8.3.6 Short Circuit Protection
        1. 8.3.6.1 Short-Circuits During Normal Operation
        2. 8.3.6.2 Short-Circuits During Start-Up
      7. 8.3.7 Output Discharge During Shutdown
      8. 8.3.8 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation with VI < 2.9 V
      2. 8.4.2 Operation with VI ≈ VPOS (Diode Mode)
      3. 8.4.3 Operation with CTRL
    5. 8.5 Programming
      1. 8.5.1 Programming VNEG
  9. 9 Applications 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 Inductor Selection
        2. 9.2.2.2 Capacitor Selection
        3. 9.2.2.3 Stability
      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 第三方产品免责声明
    2. 12.2 相关链接
    3. 12.3 商标
    4. 12.4 静电放电警告
    5. 12.5 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

9 Applications and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

Figure 9 shows a typical application circuit suitable for supplying AMOLED displays in smartphone applications. The circuit is designed to operate from a single-cell Li-Ion battery and generates a positive output voltage VPOS of 4.6 V and a negative output voltage of –4 V. Both outputs are capable of supplying up to 300 mA of output current.

9.2 Typical Application

Schem_01_TPS65631W.gifFigure 9. Typical Application Schematic

9.2.1 Design Requirements

For this design example, use the following input parameters.

Table 2. Design Parameters

DESIGN PARAMETER EXAMPLE
Input voltage range 2.9 V to 4.5 V
Output voltage VPOS = 4.6V, VNEG = –4 V

9.2.2 Detailed Design Procedure

In order to maximize performance, the TPS65631W has been optimized for use with a relatively narrow range of component values, and customers are strongly recommended to use the application circuit shown in Figure 9 with the components listed in Table 3 and Table 4.

9.2.2.1 Inductor Selection

The boost converter and inverting buck-boost converter have been optimized for use with 10 µH inductors, and it is recommended that this value be used in all applications. Customers using other values of inductor are strongly recommended to characterize circuit performance on a case-by-case basis.

Table 3. Inductor Selection(1)

PARAMETER VALUE MANUFACTURER PART NUMBER
L1, L2 10 µH Toko DFE252012C-100M
ABCO LPP252012-100M
Taiyo Yuden MDKK2020T-100M

9.2.2.2 Capacitor Selection

The recommended capacitor values are shown in Table 4. Applications using less than the recommended capacitance (e.g. to save PCB area) may experience increased voltage ripple. In general, the lower the output power, the lower the necessary capacitance.

Table 4. Capacitor Selection(1)

PARAMETER VALUE MANUFACTURER PART NUMBER
C1 2 × 10 µF Murata GRM21BR71A106KE51
C2 10 µF Murata GRM21BR71A106KE51
C3 2 × 10 µF Murata GRM21BR71A106KE51
C4 100 nF Murata GRM21BR71E104KA01

9.2.2.3 Stability

Applications using component values that differ significantly from those recommended in Table 3 and Table 4 should be checked for stability over the full range of operating conditions.

9.2.3 Application Curves

The performance shown in the following graphs was obtained using the circuit shown in Figure 9 and the external components shown in Table 3 and Table 4. The output voltage settings for these measurements were VPOS = 4.6 V and VNEG = –4 V.

TPS65631W_App_Perf_01.png
Figure 10. Efficiency vs. Output Current
TPS65631W_App_Perf_02.gifFigure 12. Start-Up Waveforms
TPS65631W_App_Perf_04.gifFigure 14. VPOS Switch Voltage, Inductor Current and Output Voltage Ripple (IO = 200 mA)
TPS65631W_App_Perf_06.gif
Figure 16. VNEG Switch Voltage, Inductor Current and Output Voltage Ripple (IO = 200 mA)
TPS65631W_App_Perf_08.png
Figure 18. Inverting Buck-Boost Converter Line Regulation
TPS65631W_App_Perf_10.png
Figure 20. Inverting Buck-Boost Converter Load Regulation
TPS65631W_App_Perf_12.gif
A.
Figure 22. Boost Converter Load Transient Response
TPS65631W_App_Perf_01a.png
A.
Figure 11. Efficiency vs. Output Current (Log Scale)
TPS65631W_App_Perf_03.gifFigure 13. VPOS Switch Voltage, Inductor Current and Output Voltage Ripple (IO = 100 mA)
TPS65631W_App_Perf_05.gifFigure 15. VNEG Switch Voltage, Inductor Current and Output Voltage Ripple (IO = 100 mA)
TPS65631W_App_Perf_07.png
Figure 17. Boost Converter Line Regulation
TPS65631W_App_Perf_09.png
Figure 19. Boost Converter Load Regulation
TPS65631W_App_Perf_11.gif
Figure 21. Line Transient Response
TPS65631W_App_Perf_13.gif
Figure 23. Inverting Buck-Boost Converter Load Transient Response