SLVSL93A March   2026  – April 2026 UCC34141

PRODUCTION DATA  

  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 Limiting Values
    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 Output Short Circuit Protection
        6. 7.3.4.6 Over-Temperature Protection
        7. 7.3.4.7 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 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.2.2.2 COM-VEE Voltage Regulation and Single Output Configuration

UCC34141 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. TI recommends a 180kΩ SMD resistor with ≤±5% tolerance. A RFBVEE lower than 150kΩ can trigger VDD and VEE dual output mode, and a RFBVEE higher than 300kΩ can trigger FBVEE pin-open fault. The typical application schematic of single output configuration is shown in Figure 8-2

Table 8-2 RFBVEE Programming
RFBVEE 0kΩ to 5kΩ25kΩ to 85kΩ150kΩ to 300kΩ>1000kΩ
Operation ModeTrigger FBVEE pin-short fault, output shuts off.

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, output shuts off.

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 from -2V to -8V. The transfer function between COM-VEE and RFBVEE in dual output mode is

Equation 4. RFBVEE=(0.5V-VVEE)×45kΩ4.5V

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

Equation 5. RFBVEE=[0.5V-(-5V)]×45kΩ4.5V=55kΩ