SLUSFF2C September   2023  – December 2025 UCG28824 , UCG28826 , UCG28828

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 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Detailed Pin Descriptions
      1. 7.3.1  HV - High Voltage Input
      2. 7.3.2  SW - Switch Node
      3. 7.3.3  GND – Ground Return
      4. 7.3.4  FLT - External Overtemperature Fault
      5. 7.3.5  FB ­­– Feedback
      6. 7.3.6  TR - Turns Ratio
      7. 7.3.7  IPK - Peak Current and Dithering
      8. 7.3.8  FCL - Frequency Clamp and Fault Response
      9. 7.3.9  CDX - CCM, Drive Strength, and X-cap Discharge
      10. 7.3.10 VCC - Input Bias
    4. 7.4 Feature Description
      1. 7.4.1  Self Bias and Auxless Sensing
      2. 7.4.2  Control Law
        1. 7.4.2.1 Valley Switching
        2. 7.4.2.2 Frequency Foldback
        3. 7.4.2.3 Burst Mode
        4. 7.4.2.4 Continuous Conduction Mode (CCM)
      3. 7.4.3  GaN HEMT Switching Capability
      4. 7.4.4  Soft Start
      5. 7.4.5  Frequency Clamp
      6. 7.4.6  Frequency Dithering
      7. 7.4.7  Slew Rate Control
      8. 7.4.8  Transient Peak Power Capability
      9. 7.4.9  X-Cap Discharge
      10. 7.4.10 Fault Protections
        1. 7.4.10.1 Brownout Protection
        2. 7.4.10.2 Short-Circuit Protection
        3. 7.4.10.3 Output Overvoltage Protection
        4. 7.4.10.4 Overpower Protection (OPP, LPS)
        5. 7.4.10.5 Overtemperature Protection
        6. 7.4.10.6 Open FB Protection
        7. 7.4.10.7 Error Codes for Protections
  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 Input Bulk Capacitor
        2. 8.2.2.2 Transformer Primary Inductance and Turns Ratio
        3. 8.2.2.3 Output Capacitor
        4. 8.2.2.4 Selection Resistors
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

4 Device Comparison

Table 4-1 Related Products
DEVICE NAME DESCRIPTION
UCG28824 Self-biased QR flyback converter with 750V, 270mΩ GaN FET for 45W designs
UCG28826 Self-biased QR flyback converter with 750V, 170mΩ GaN FET for 65W designs
UCG28828 Self-biased QR flyback converter with 750V, 170mΩ GaN FET for 120W designs (with PFC input)
UCC28881 4.5W, 700V AC/DC flyback converter with integrated FET
UCC28910 6W and 7.5W, 700V primary side regulated flyback converter
Table 4-2 UCG2882x Device Options
UCG28826-1 UCG28826-3 UCG28826-4 UCG28826-5 UCG28828-1 UCG28828-2(1) UCG28824-1
Power Level 65W 65W 65W 65W 120W 120W 45W
Rdson 170mΩ 170mΩ 170mΩ 170mΩ 170mΩ 170mΩ 270mΩ
OPPL 100W 100W 80W Disabled Disabled Disabled 69W
OPPH 140W 140W 140W 140W 190W 190W 97W
LPS 7.5A 7.5A 7.5A Disabled Disabled Disabled 5.2A
Brownout/in 80VAC/70VAC 80VAC/70VAC 80VAC/70VAC 67VAC/57VAC 80VAC/70VAC 80VAC/70VAC 80VAC/70VAC
Output OVP 25V 25V 16V 25V 25V 25V 25V
Input OVP No No No No No 315VAC No
High Line CCM No No No No No Yes No
EMI Dithering Frequency 6.25kHz 390Hz 6.25kHz 6.25kHz 6.25kHz 6.25kHz 6.25kHz
(1) Contact TI before ordering