SLUSFP1B April   2025  – November 2025 UCC34141-Q1

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Insulation Specifications
    6. 6.6 Electrical Characteristics
    7. 6.7 Safety-Related Certifications
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Power Stage Operation
        1. 7.3.1.1 VDD-COM Voltage Regulation
        2. 7.3.1.2 COM-VEE Voltage Regulation
        3. 7.3.1.3 COM-VEE Output Capability
      2. 7.3.2 Output Voltage Soft Start
      3. 7.3.3 ENA and Power-Good
      4. 7.3.4 Protection Functions
        1. 7.3.4.1 Input Undervoltage Lockout
        2. 7.3.4.2 Input Overvoltage Lockout
        3. 7.3.4.3 Output Undervoltage Protection
        4. 7.3.4.4 Output Overvoltage Protection
        5. 7.3.4.5 Over-Temperature Protection
        6. 7.3.4.6 BSW Pin Faults Protection
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 VDD-COM Voltage Regulation
        2. 8.2.2.2 COM-VEE Voltage Regulation and Single Output Configuration
    3. 8.3 System Examples
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Third-Party Products Disclaimer
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Packaging Information
    2. 11.2 Tape and Reel Information
    3. 11.3 Mechanical Data

8.2.2.2 COM-VEE Voltage Regulation and Single Output Configuration

UCC34141-Q1 can be configured either as a dual output or a single output converter, using the VEE feedback resistor RFBVEE. The table below summarizes the programmable range with different RFBVEE value. The VDD single output mode can be programmed by a RFBVEE value between 150kΩ and 300kΩ. We recommend a 180kΩ SMD resistor with ≤±5% tolerance. A RFBVEE lower than 150kΩ could trigger VDD & VEE dual output mode, and a RFBVEE higher than 300kΩ could trigger FBVEE pin-open fault. The typical application schematic of single output configuration is shown in Figure 8-2

Table 8-1 RFBVEE Programming
RFBVEE 0 - 3kΩ20kΩ - 80kΩ150kΩ - 300kΩ>500kΩ
Operation Mode

Trigger FBVEE pin-short fault

SMD resistor with ±5% tolerance is enough

VEE in regulation, VDD & VEE dual output

Recommend a SMD resistor with ≤ ±1% tolerance for best regulation accuracy.

VDD single output

Recommend a 180kΩ SMD resistor with ≤±5% tolerance.

Trigger FBVEE pin-open fault

An internal buck-boost converter generates the regulated negative VEE voltage. The buck-boost converter operation is determined by sensing the VEE voltage on FBVEE pin. With an internal 45k resistor and a 4.5V reference voltage, VEE voltage can be programed and regulated between -2V to -8V. The transfer function between COM-VEE and RFBVEE in dual output mode is

Equation 4. R F B V E E = - V V E E * 4 5 k Ω 4.5 V

An example equation to set a VEE regulation value at -5V

Equation 5. R F B V E E = - ( - 5 V ) * 4 5 k Ω 4.5 V = 5 0 k Ω