ZHCSCK0C June 2014 – September 2021 TPS55340-Q1
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3 Feature Description
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
TPS55340-Q1 Boost Converter
- 8.2.1.1 Design Requirements
- 8.2.1.2
Detailed Design Procedure
- 8.2.1.2.1 Custom Design With WEBENCH® Tools
- 8.2.1.2.2 Selecting the Switching Frequency (R4)
- 8.2.1.2.3 Determining the Duty Cycle
- 8.2.1.2.4 Selecting the Inductor (L1)
- 8.2.1.2.5 Computing the Maximum Output Current
- 8.2.1.2.6 Selecting the Output Capacitor (C8 through C10)
- 8.2.1.2.7 Selecting the Input Capacitors (C2 and C7)
- 8.2.1.2.8 Setting the Output Voltage (R1 and R2)
- 8.2.1.2.9 Setting the Soft-Start Time (C7)
- 8.2.1.2.10 Selecting the Schottky Diode (D1)
- 8.2.1.2.11 Compensating the Control Loop (R3, C4, and C5)
- 8.2.1.3 Application Curves
- 8.2.2
TPS55340-Q1 SEPIC Converter
- 8.2.2.1 Design Requirements
- 8.2.2.2
Detailed Design Procedure
- 8.2.2.2.1 Selecting the Switching Frequency (R4)
- 8.2.2.2.2 Duty Cycle
- 8.2.2.2.3 Selecting the Inductor (L1)
- 8.2.2.2.4 Calculating the Maximum Output Current
- 8.2.2.2.5 Selecting the Output Capacitor (C8 Through C10)
- 8.2.2.2.6 Selecting the Series Capacitor (C6)
- 8.2.2.2.7 Selecting the Input Capacitor (C2 and C7)
- 8.2.2.2.8 Selecting the Schottky Diode (D1)
- 8.2.2.2.9 Setting the Output Voltage (R1 and R2)
- 8.2.2.2.10 Setting the Soft-Start Time (C3)
- 8.2.2.2.11 Mosfet Rating Considerations
- 8.2.2.2.12 Compensating the Control Loop (R3 and C4)
- 8.2.2.3 Application Curves
- 8.2.1
TPS55340-Q1 Boost Converter
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
8.2.1.2.8 Setting the Output Voltage (R1 and R2)
To set the output voltage in either DCM or CCM, use Equation 26 and Equation 27 to calculate the values of R1 and R2.
Equation 26. 
Equation 27. 
Considering the leakage current through the resistor divider and noise decoupling into FB pin, an optimum value for R2 is around 10 kΩ. The output voltage tolerance depends on the V(FB) accuracy and the tolerance of R1 and R2. In this example, with a 24-V output, R1 is calculated to 185.3 kΩ using Equation 27. The nearest standard value of 187 kΩ is used.