ZHCSKO6B July 2010 – January 2020 BQ24650
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 说明 （续）
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Battery Voltage Regulation
- 8.3.2 Input Voltage Regulation
- 8.3.3 Battery Current Regulation
- 8.3.4 Battery Precharge
- 8.3.5 Charge Termination and Recharge
- 8.3.6 Power Up
- 8.3.7 Enable and Disable Charging
- 8.3.8 Automatic Internal Soft-Start Charger Current
- 8.3.9 Converter Operation
- 8.3.10 Synchronous and Non-Synchronous Operation
- 8.3.11 Cycle-by-Cycle Charge Undercurrent
- 8.3.12 Input Overvoltage Protection (ACOV)
- 8.3.13 Input Undervoltage Lockout (UVLO)
- 8.3.14 Battery Overvoltage Protection
- 8.3.15 Cycle-by-Cycle Charge Overcurrent Protection
- 8.3.16 Thermal Shutdown Protection
- 8.3.17 Temperature Qualification
- 8.3.18 Charge Enable
- 8.3.19 Inductor, Capacitor, and Sense Resistor Selection Guidelines
- 8.3.20 Charge Status Outputs
- 8.3.21 Battery Detection
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文档支持
- 13机械、封装和可订购信息
9.2.2.1 Inductor Selection
The BQ24650 has a 600-kHz switching frequency to allow the use of small inductor and capacitor values. Inductor saturation current must be higher than the charging current (ICHG) plus half the ripple current (IRIPPLE):
Equation 12. 
Inductor ripple current depends on input voltage (VIN), duty cycle (D = VOUT/VIN), switching frequency (fs), and inductance (L):
Equation 13. 
The maximum inductor ripple current happens with D = 0.5 or close to 0.5. Usually inductor ripple is designed in the range of 20% to 40% of the maximum charging current as a trade-off between inductor size and efficiency for a practical design.