ZHCSBE5C August 2013 – November 2021 TPS62090-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 Enable and Disable (EN)
- 7.3.2 Soft Start (SS) and Hiccup Current Limit During Start-Up
- 7.3.3 Voltage Tracking (SS)
- 7.3.4 Short-Circuit Protection (Hiccup Mode)
- 7.3.5 Output Discharge Function
- 7.3.6 Power Good Output (PG)
- 7.3.7 Frequency Set Pin (FREQ)
- 7.3.8 Undervoltage Lockout (UVLO)
- 7.3.9 Thermal Shutdown
- 7.3.10 Charge Pump (CP, CN)
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
8.2.2.3 Setting the Output Voltage
The output voltage is set by an external resistor divider according to Equation 7, Equation 8, and Equation 9.
Equation 7. 
Equation 8. 
Equation 9. 
When sizing R2, use a minimum of 5 µA for the feedback current (IFB) to achieve low quiescent current and acceptable noise sensitivity. Larger currents through R2 improve noise sensitivity and output voltage accuracy. A feed-forward capacitor is not required for proper operation.