SLUUCY1 November   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Configurations and Modifications
      1. 2.1.1 Output Voltage
      2. 2.1.2 Switching Frequency (FSEL Pin)
      3. 2.1.3 Current Limit, Soft-Start Time, and Internal Compensation (MODE Pin)
      4. 2.1.4 Adjustable UVLO
    2. 2.2 Input/Output Connections
    3. 2.3 Best Practices
  8. 3Implementation Results
    1. 3.1 Performance Characteristics Summary
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
      1. 4.2.1 Layout
    3. 4.3 Bill of Materials
  10. 5Additional Information
    1.     Trademarks

2.1.1 Output Voltage

In the U1 design, the output voltage is set by the resistor divider network of R14 (RFBT) and R11 (RFBB). R11 is fixed at 4.99 kΩ to set the FB divider current at approximately 100 µA. To change the output voltage of the EVM, the value of resistor R14 must change. Changing the value of R14 can change the output voltage above the 0.5-V reference voltage (VREF). The value of R14 for a specific output voltage can be calculated using Equation 1. After changing R14, the feedfoward capacitor (C32) can also need to be changed.

Equation 1. RFBT=RFBB×VOUTVREF   -   1