ZHCSNA3 October 2021 TPS562212
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 Advanced Emulated Current Mode Control
- 7.3.2 Mode Selection and PG/SS Pin Function Configuration
- 7.3.3 Power Good (PG)
- 7.3.4 Soft Start and Pre-Biased Soft Start
- 7.3.5 Output Discharge Through PG/SS Pin
- 7.3.6 Precise Enable and Adjusting Undervoltage Lockout
- 7.3.7 Overcurrent Limit and Undervoltage Protection
- 7.3.8 Overvoltage Protection
- 7.3.9 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
8.2.2.2 Output Voltage Resistors Selection
The output voltage is set with a resistor divider from the output node to the FB pin. TI recommends using 1% tolerance or better divider resistors. Referring to the application schematic of Figure 8-1, start with 10 kΩ or 20 kΩ for R9 and use Equation 11 to calculate R8. To improve efficiency at light loads, consider using larger value resistors. If the values are too high, the regulator is more susceptible to noise and voltage errors from the FB input current are noticeable.
Equation 11. 
Table 8-2 shows the recommended components value for common output voltages.