ZHCSM89 july   2021 BQ51013B-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Description (continued)
  7. 6 Device Comparison Table
  8. 7 Pin Configuration and Functions
  9. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Details of a Qi Wireless Power System and BQ51013B-Q1 Power Transfer Flow Diagrams
      2. 9.3.2  Dynamic Rectifier Control
      3. 9.3.3  Dynamic Efficiency Scaling
      4. 9.3.4  RILIM Calculations
      5. 9.3.5  Input Overvoltage
      6. 9.3.6  Adapter Enable Functionality and EN1/EN2 Control
      7. 9.3.7  End Power Transfer Packet (WPC Header 0x02)
      8. 9.3.8  Status Outputs
      9. 9.3.9  WPC Communication Scheme
      10. 9.3.10 Communication Modulator
      11. 9.3.11 Adaptive Communication Limit
      12. 9.3.12 Synchronous Rectification
      13. 9.3.13 Temperature Sense Resistor Network (TS)
      14. 9.3.14 3-State Driver Recommendations for the TS/CTRL Pin
      15. 9.3.15 Thermal Protection
      16. 9.3.16 WPC v1.2 Compliance – Foreign Object Detection
      17. 9.3.17 Receiver Coil Load-Line Analysis
    4. 9.4 Device Functional Modes
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 BQ51013B-Q1 Wireless Power Receiver Used as a Power Supply
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Using The BQ51013B-Q1 as a Wireless Power Supply: (See )
          2. 10.2.1.2.2 Series and Parallel Resonant Capacitor Selection
          3. 10.2.1.2.3 Recommended RX Coils
          4. 10.2.1.2.4 COMM, CLAMP, and BOOT Capacitors
          5. 10.2.1.2.5 Control Pins and CHG
          6. 10.2.1.2.6 Current Limit and FOD
          7. 10.2.1.2.7 RECT and OUT Capacitance
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Dual Power Path: Wireless Power and DC Input
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curves
      3. 10.2.3 Wireless and Direct Charging of a Li-Ion Battery at 800 mA
        1. 10.2.3.1 Design Requirements
        2. 10.2.3.2 Detailed Design Procedure
        3. 10.2.3.3 Application Curves
  12. 11Power Supply Recommendations
  13. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  14. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 第三方产品免责声明
      2. 13.1.2 Development Support
    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 静电放电警告
    6. 13.6 术语表
  15. 14Mechanical, Packaging, and Orderable Information

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10.2.3.2 Detailed Design Procedure

The basic BQ51013B-Q1 design is identical to the Section 10.2.2. The BQ51013B-Q1 OUT pin is tied to the output of Q1 and directly to the IN pin of the BQ24040. No other changes to the BQ51013B-Q1 circuitry are required.

The BQ24040 has a few parameters that need to be programmed for this charger to work properly. Ceramic decoupling capacitors are needed on the IN and OUT pins using the values shown in Figure 10-11. After evaluation during actual system operational conditions, the final values may be adjusted up or down. In high amplitude pulsed load applications, the IN and OUT capacitors will generally require larger values. The next step is setting up the fast charge current and pre-charge and termination current.

Program the Fast Charge Current, ISET: RISET = [KISET/IOUT] = [540 AΩ / 0.8 A] = 675 Ω.

Program the Termination Current, ITERM: RPRE-TERM = [KTERM/%OUT-FC] = 200 Ω/% x 10% = 2 kΩ.

TS Function: To enable the temperature sense function, a 10-kΩ NTC thermistor (103AT) from TS to VSS should be placed in the battery pack. To disable the temperature sense function, use a fixed 10-kΩ resistor between TS and VSS.

Figure 10-12 shows start-up of the wireless system with the BQ24040 charger when TX power is applied after the full RX system has been placed on the charging pad. Channel 1 (yellow) shows the initial power to the TX system. The RECT pin of the BQ51013B-Q1 is shown on Channel 3 (purple). The output of the BQ24040 is shown on Channel 2 (blue). Battery current can be seen on Channel 4 (green).

Figure 10-13 shows a similar condition but in this case, the battery is not connected initially, so the battery detection routine can be observed. After the battery is connected to the charger, the charge current jumps to 800 mA and the output voltage becomes stable. Both the current out of the BQ51013B-Q1 (Channel 1, yellow) and the current out of the BQ24040 (Channel 4, green) can be seen.