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
8.3.4 Battery Precharge
On power-up, if the battery voltage is below the VLOWV threshold, the BQ24650 applies the precharge current to the battery. This feature is intended to revive deeply discharged cells. If the VLOWV threshold is not reached within 30 minutes of initiating precharge, the charger turns off and a FAULT is indicated on the status pins.
The precharge current is determined as 1/10 of the fast charge current according to Equation 4:
Equation 4. 