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

7.4 Device Functional Modes

Depending on the input and output conditions, ENA pin voltage, as well as the device temperature, the UCC34141-Q1 operates in one of the below operation modes.

  1. Disable mode. In this mode, the module is off, waiting for ENA pin to go high to begin operation.
  2. Soft-start mode. In this mode, the module starts to deliver power to the secondary side. The primary-side operation duty cycle is raised gradually to reduce the stress to the module.
  3. Normal operation mode. In this mode, the module operates normally, delivering power to the secondary side.
  4. Protection mode, auto-recovery. In this mode the module is off due to the input UVLO or OVLO protection. After the input voltage fault is cleared, depending on the ENA pin voltage condition, it either becomes disabled mode if the ENA pin voltage is low, or it goes through soft-start mode to the normal operation mode.
  5. Protection mode, latched-off. In this mode the part is off due to other protections. The module remains off even the fault causing the protection is cleared. Recycling VVIN operation must ensure the input voltage goes below the analog UVLO falling threshold (VVIN_UVLO_F) first to reset the latch-off state, or the ENA pin is toggled Low (OFF) then High (ON).
  6. Protection mode, auto-restart after defined duration tRESTART. In this mode, the part shuts down due to other protections.Once the part shuts down, a tRESTART timer will start and then the part will attempt an auto-restart with a new soft-start sequence. If the fault has been removed, the part will soft-start to regulation successfullly. If the fault condition remains, the part will shut down again and attempt another auto-restart. The device can continuously operate safely in hiccup mode as long as the fault occurs.

Table 7-1 lists the supply functional modes for this device. The ENA pin has an internal weak pull-down resistance to ground, but TI does not recommend leaving this pin open.

Table 7-1 Device Functional Modes

INPUT

OUTPUTS

 OPERATION MODE
VVIN ENA FAULT V(VDD – COM)
Isolated Output1		 V(COM – VEE)
Isolated Output2		 Power-Good(1) (2)
Open Drain
VVIN < VVIN_UVLO_R X X OFF OFF Non-Active Status Protection mode, auto-recovery
VVIN_UVLO_R < VVIN < VVIN_OVLO_R LOW X OFF OFF Non-Active Status Disable mode
VVIN_UVLO_R < VVIN < VVIN_OVLO_R HIGH NO FAULT Regulating at Setpoint Regulating at Setpoint Active Status Normal operation
VVIN_UVLO_R < VVIN < VVIN_OVLO_R HIGH YES FAULT OFF OFF Non-Active Status Protection mode, latched-off or auto-restart after tRESTART
VVIN > VVIN_OVLO_R X X OFF OFF Non-Active Status Protection mode, auto-recovery
(1) For Power-Good active HIGH devices listed in Table 4-1: Active status PG = HIGH , Non-Active status PG = LOW .
(2) For Power-Good active LOW devices listed in Table 4-1: Active status PG = LOW , Non-Active status PG = HIGH.