ZHCSMV3A December 2020 – December 2021 TPS552882-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
- 7.3.1 VCC Power Supply
- 7.3.2 Operation Mode Setting
- 7.3.3 Input Undervoltage Lockout
- 7.3.4 Enable and Programmable UVLO
- 7.3.5 Soft Start
- 7.3.6 Shutdown
- 7.3.7 Switching Frequency
- 7.3.8 Switching Frequency Dithering
- 7.3.9 Inductor Current Limit
- 7.3.10 Internal Charge Path
- 7.3.11 Output Voltage Setting
- 7.3.12 Output Current Indication and Cable Voltage Drop Compensation
- 7.3.13 Integrated Gate Drivers
- 7.3.14 Output Current Limit
- 7.3.15 Overvoltage Protection
- 7.3.16 Output Short Circuit Protection
- 7.3.17 Thermal Shutdown
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
7.3.11 Output Voltage Setting
There are two ways to set the output voltage: changing the feedback ratio and changing the reference voltage. The TPS552882-Q1 uses an external resistor divider to change the feedback ratio with fixed 1.2-V reference voltages at the FB pin.
When using external output voltage feedback resistor divider as shown in Figure 7-5. Use Equation 6 to calculate the output voltage with the reference voltage at the FB pin.
Equation 6. 
Figure 7-5 Output Voltage Setting by External Resistor
DividerTI recommends using 100 kΩ for the up resistor RFB_UP. The reference voltage VREF at the FB pin is 1.2 V.