ZHCSKO6B July 2010 – January 2020 BQ24650
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 修訂歷史記錄
- 5 說明 （續(xù)）
- 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器件和文檔支持
- 13機械、封裝和可訂購信息
封裝選項
機械數(shù)據(jù) (封裝 | 引腳)
- RVA|16
散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)
- RVA|16
訂購信息
9.2.2.2 Input Capacitor
The input capacitor should have enough ripple current rating to absorb input switching ripple current. The worst-case RMS ripple current is half of the charging current when duty cycle is 0.5. If the converter does not operate at 50% duty cycle, then the worst case capacitor RMS current ICIN occurs where the duty cycle is closest to 50% and can be estimated by Equation 14:
A low ESR ceramic capacitor such as X7R or X5R is preferred for the input decoupling capacitor and must be placed as close as possible to the drain of the high-side MOSFET and source of the low-side MOSFET. The voltage rating of the capacitor must be higher than the normal input voltage level. A 25-V rating or higher capacitor is preferred for a 20-V input voltage. A 20-μF capacitance is suggested for a typical 3-A to 4-A charging current.