SLVUCX1 September   2024 TPS548B23

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Configurations and Modifications
      1. 2.1.1 Multifunction Configuration (CFG1-5) Pins Selection
      2. 2.1.2 Setting Output Voltage Using External Feedback Configuration
  9. 3Implementation Results
    1. 3.1 Test Setup and Results
      1. 3.1.1 Input and Output Connections
      2. 3.1.2 Efficiency
      3. 3.1.3 Output Voltage Regulation
      4. 3.1.4 Load Transient and Loop Response
      5. 3.1.5 Output Voltage Ripple
      6. 3.1.6 Start-up and Shutdown with EN
      7. 3.1.7 Thermal Performance
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 Board Layout
      1. 4.2.1 Layout
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks

2.1.2 Setting Output Voltage Using External Feedback Configuration

In the External Feedback configuration (see Table 2-3), the output voltage is set by the resistor divider network of R2 (RFBT) and R5 (RFBB). The FB pin is regulated to the 0.5V reference voltage (VREF). To change the output voltage, adjust the values of resistors R2 and R5. The recommended R5 value is 10kΩ, but the range can be from 1kΩ to 15kΩ. The value of R2 for a specific output voltage can be calculated using Equation 3. After changing R2, the feed-forward capacitor (C29) must also be adjusted accordingly.

Equation 3. R 2 = R 5 × V O U T 0.5   V - 1