SLUSEV9A August   2023  – September 2023 UCC14340-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Insulation Specifications
    6. 7.6 Safety-Related Certifications
    7. 7.7 Electrical Characteristics
    8. 7.8 Safety Limiting Values
    9. 7.9 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power Stage Operation
        1. 8.3.1.1 VDD-VEE Voltage Regulation
        2. 8.3.1.2 COM-VEE Voltage Regulation
        3. 8.3.1.3 Power Handling Capability
      2. 8.3.2 Output Voltage Soft Start
      3. 8.3.3 ENA and PG
      4. 8.3.4 Protection Functions
        1. 8.3.4.1 Input Undervoltage Lockout
        2. 8.3.4.2 Input Overvoltage Lockout
        3. 8.3.4.3 Output Undervoltage Protection
        4. 8.3.4.4 Output Overvoltage Protection
        5. 8.3.4.5 Overpower Protection
        6. 8.3.4.6 Overtemperature Protection
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Capacitor Selection
        2. 9.2.2.2 Single RLIM Resistor Selection
        3. 9.2.2.3 RDR Circuit Component Selection
        4. 9.2.2.4 Feedback Resistors Selection
  11. 10System Examples
  12. 11Power Supply Recommendations
  13. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  14. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Support Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  15. 14Mechanical, Packaging, and Orderable Information
  16. 15Tape and Reel Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.3.4.3 Output Undervoltage Protection

The output voltage under voltage protection is based on the FBVDD and FBVEE pin voltages. When the FBVDD pin voltage becomes lower than its UVP threshold VVDD_UVP_FALL, or the FBVEE pin voltage becomes lower than its UVP threshold VVEE_UVP_FALL, the undervoltage protection is activated. The UCC14340-Q1 stops switching, and the PG pin becomes open.

During soft start, the output voltages rise from zero. Both FBVDD and FBVEE pin voltage are below the UVP thresholds. The UVP is disabled during the soft start. If the pin voltage cannot reach the UVP recovery thresholds (VVDD_UVP_RISE, VVEE_UVP_RISE) after the soft start completes, undervoltage protection is activated. The UCC14340-Q1 stops switching, and the PG pin becomes open.

The undervoltage protection has a latched-off response. After it is activated, the latch-off state can be cleared by recycling VVIN. Toggling ENA pin can also reset the latch-off state. Refer to ENA and PG section for details.