ZHCSJY4B July 2008 – June 2019 TPS5450-Q1
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 Oscillator Frequency
- 7.3.2 Voltage Reference
- 7.3.3 Enable (ENA) and Internal Slow Start
- 7.3.4 Undervoltage Lockout (UVLO)
- 7.3.5 Output Feedback (VSENSE) and Internal Compensation
- 7.3.6 Voltage Feedforward
- 7.3.7 Pulse-Width-Modulation (PWM) Control
- 7.3.8 Overcurrent Limiting
- 7.3.9 Overvoltage Protection
- 7.3.10 Thermal Shutdown
-
8 Application Information
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Custom Design With WEBENCH® Tools
- 8.2.2.2 Boost Capacitor (BOOT)
- 8.2.2.3 Switching Frequency
- 8.2.2.4 Input Capacitors
- 8.2.2.5 Output Filter Components
- 8.2.2.6 Output Voltage Setpoint
- 8.2.2.7 Boot Capacitor
- 8.2.2.8 Catch Diode
- 8.2.2.9 Output Voltage Limitations
- 8.2.2.10 Internal Compensation Network
- 8.2.3 Application Curves
- 9 Layout
- 10器件和文档支持
- 11机械、封装和可订购信息
7.3.6 Voltage Feedforward
The internal voltage feedforward provides a constant dc power stage gain despite any variations with the input voltage. This greatly simplifies the stability analysis and improves the transient response. Voltage feedforward varies the peak ramp voltage inversely with the input voltage so that the modulator and power stage gain are constant at the feed forward gain:
Equation 1. 
The typical feed forward gain of TPS5450-Q1 is 25.