ZHCSGJ0B May 2017 – March 2018 TPS543B20
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4
Device Functional Modes
- 8.4.1 Soft-Start Operation
- 8.4.2 Input and VDD Undervoltage Lockout (UVLO) Protection
- 8.4.3 Power Good and Enable
- 8.4.4 Voltage Reference
- 8.4.5 Prebiased Output Start-up
- 8.4.6 Internal Ramp Generator
- 8.4.7 Switching Frequency
- 8.4.8 Clock Sync Point Selection
- 8.4.9 Synchronization and Stackable Configuration
- 8.4.10 Dual-Phase Stackable Configurations
- 8.4.11 Operation Mode
- 8.4.12 API/BODY Brake
- 8.4.13 Sense and Overcurrent Protection
- 8.4.14 Output Overvoltage and Undervoltage Protection
- 8.4.15 Overtemperature Protection
- 8.4.16 RSP/RSN Remote Sense Function
- 8.4.17 Current Sharing
- 8.4.18 Loss of Synchronization
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application: TPS543B20 Stand-alone Device
- 9.2.1 Design Requirements
- 9.2.2 Detailed Design Procedure
- 9.2.3 Application Curves
- 9.3 System Example
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
9.2.2.2 Switching Frequency Selection
Select a switching frequency for the TPS543B20. There is a trade off between higher and lower switching frequencies. Higher switching frequencies may produce smaller solution size using lower valued inductors and smaller output capacitors compared to a power supply that switches at a lower frequency. However, the higher switching frequency causes extra switching losses, which decrease efficiency and impact thermal performance. In this design, a moderate switching frequency of 500 kHz achieves both a small solution size and a high efficiency operation is selected. The device supports continuous switching frequency programming; see Equation 4. additional considerations (internal ramp compensation) other than switching frequency need to be included.
In this case, a standard resistor value of 40.2 kΩ is selected.