ZHCSM89 july 2021 BQ51013B-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Description (continued)
- 6 Device Comparison Table
- 7 Pin Configuration and Functions
- 8 Specifications
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Details of a Qi Wireless Power System and BQ51013B-Q1 Power Transfer Flow Diagrams
- 9.3.2 Dynamic Rectifier Control
- 9.3.3 Dynamic Efficiency Scaling
- 9.3.4 RILIM Calculations
- 9.3.5 Input Overvoltage
- 9.3.6 Adapter Enable Functionality and EN1/EN2 Control
- 9.3.7 End Power Transfer Packet (WPC Header 0x02)
- 9.3.8 Status Outputs
- 9.3.9 WPC Communication Scheme
- 9.3.10 Communication Modulator
- 9.3.11 Adaptive Communication Limit
- 9.3.12 Synchronous Rectification
- 9.3.13 Temperature Sense Resistor Network (TS)
- 9.3.14 3-State Driver Recommendations for the TS/CTRL Pin
- 9.3.15 Thermal Protection
- 9.3.16 WPC v1.2 Compliance – Foreign Object Detection
- 9.3.17 Receiver Coil Load-Line Analysis
- 9.4 Device Functional Modes
-
10Application and Implementation
- 10.1 Application Information
- 10.2
Typical Applications
- 10.2.1
BQ51013B-Q1 Wireless Power Receiver Used as a Power
Supply
- 10.2.1.1 Design Requirements
- 10.2.1.2
Detailed Design Procedure
- 10.2.1.2.1 Using The BQ51013B-Q1 as a Wireless Power Supply: (See )
- 10.2.1.2.2 Series and Parallel Resonant Capacitor Selection
- 10.2.1.2.3 Recommended RX Coils
- 10.2.1.2.4 COMM, CLAMP, and BOOT Capacitors
- 10.2.1.2.5 Control Pins and CHG
- 10.2.1.2.6 Current Limit and FOD
- 10.2.1.2.7 RECT and OUT Capacitance
- 10.2.1.3 Application Curves
- 10.2.2 Dual Power Path: Wireless Power and DC Input
- 10.2.3 Wireless and Direct Charging of a Li-Ion Battery at 800 mA
- 10.2.1
BQ51013B-Q1 Wireless Power Receiver Used as a Power
Supply
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
9.3.3 Dynamic Efficiency Scaling
The Dynamic Efficiency Scaling feature allows for the loss characteristics of the BQ51013B-Q1 to be scaled based on the maximum expected output power in the end application. This effectively optimizes the efficiency for each application. This feature is achieved by scaling the loss of the internal LDO based on a percentage of the maximum output current. Note that the maximum output current is set by the KIMAX term and the RILIM resistance (where RILIM = KIMAX / IMAX). The flow diagram shown in Figure 9-3 illustrates how the rectifier is dynamically controlled (Dynamic Rectifier Control) based on a fixed percentage of the IMAX setting. Table 9-1 summarizes how the rectifier behavior is dynamically adjusted based on two different RILIM settings.
| OUTPUT CURRENT PERCENTAGE | RILIM = 500 Ω IMAX = 0.5 A | RILIM = 220 Ω IMAX = 1.14 A | VRECT |
|---|---|---|---|
| 0 to 10% | 0 A to 0.05 A | 0 A to 0.114 A | 7.08 V |
| 10 to 20% | 0.05 A to 0.1 A | 0.114 A to 0.227 A | 6.28 V |
| 20 to 40% | 0.1 A to 0.2 A | 0.227 A to 0.454 A | 5.53 V |
| >40% | > 0.2 A | > 0.454 A | 5.11 V |
Figure 8-5 illustrates the shift in the Dynamic Rectifier Control behavior based on the two different RILIM settings. With the rectifier voltage (VRECT) being the input to the internal LDO, this adjustment in the Dynamic Rectifier Control thresholds will dynamically adjust the power dissipation across the LDO where:
Figure 8-3 illustrates how the system efficiency is improved due to the Dynamic Efficiency Scaling feature. Note that this feature balances efficiency with optimal system transient response.