ZHCSIH1A July 2018 – September 2019 TPS56637
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 The Adaptive On-Time Control and PWM Operation
- 7.3.2 Mode Selection
- 7.3.3 Soft Start and Pre-Biased Soft Start
- 7.3.4 Enable and Adjusting Undervoltage Lockout
- 7.3.5 Output Overcurrent Limit and Undervoltage Protection
- 7.3.6 Overvoltage Protection
- 7.3.7 UVLO Protection
- 7.3.8 Thermal Shutdown
- 7.3.9 Output Voltage Discharge
- 7.3.10 Power Good
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
8.2.2.3 Input Capacitor Selection
The TPS56637 requires an input decoupling capacitor and a bulk capacitor is needed depending on the application. TI recommends a ceramic capacitor over 10 µF for the decoupling capacitor. An additional 0.1-µF capacitor (C3) from VIN to PGND pin is recommended to provide additional high frequency filtering. The capacitor voltage rating needs to be greater than the maximum input voltage. The input voltage ripple can be calculated using Equation 11.
Equation 11. 
The capacitor must also have a ripple current rating greater than the maximum input current ripple of the application. The input ripple current is calculated by Equation 12:
Equation 12. 