ZHCSOQ1D october 2022 – september 2023 TPS61033 , TPS610333
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Device Comparison Table
- 5 Revision History
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Undervoltage Lockout
- 8.3.2 Enable and Soft Start
- 8.3.3 Setting the Output Voltage
- 8.3.4 Current Limit Operation
- 8.3.5 Pass-Through Operation
- 8.3.6 Power Good Indicator
- 8.3.7 Implement Output Discharge by PG function
- 8.3.8 Overvoltage Protection
- 8.3.9 Output Short-to-Ground Protection
- 8.3.10 Thermal Shutdown
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Device and Documentation Support
- 11Mechanical, Packaging, and Orderable Information
9.2.2.1 Setting the Output Voltage
The output voltage is set by an external resistor divider (R1, R2 in Figure 9-1). When the output voltage is regulated, the typical voltage at the FB pin is VREF. Thus the resistor divider is determined by Equation 5.
Equation 5. 
where
- VOUT is the regulated output voltage
- VREF is the internal reference voltage at the FB pin
For the best accuracy, keep R2 smaller than 300 kΩ to ensure the current flowing through R2 is at least 100 times larger than the FB pin leakage current. Changing R2 towards a lower value increases the immunity against noise injection. Changing the R2 towards a higher value reduces the quiescent current for achieving highest efficiency at low load currents.