SLUSDT2C August   2019  – December 2020 UCC28740-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1. 5.1 Pin Functions
  6. 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 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Detailed Pin Description
      2. 7.3.2 Valley-Switching and Valley-Skipping
      3. 7.3.3 Startup Operation
      4. 7.3.4 Fault Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Secondary-Side Optically Coupled Constant-Voltage (CV) Regulation
      2. 7.4.2 Primary-Side Constant-Current (CC) Regulation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 High Voltage Applications
    3. 8.3 Typical Application
      1. 8.3.1 Design Requirements
      2. 8.3.2 Detailed Design Procedure
        1. 8.3.2.1  Custom Design With WEBENCH® Tools
        2. 8.3.2.2  Standby Power Estimate and No-Load Switching Frequency
        3. 8.3.2.3  Input Bulk Capacitance and Minimum Bulk Voltage
        4. 8.3.2.4  35
        5. 8.3.2.5  Transformer Turns-Ratio, Inductance, Primary Peak Current
        6. 8.3.2.6  Transformer Parameter Verification
        7. 8.3.2.7  VS Resistor Divider, Line Compensation
        8. 8.3.2.8  Output Capacitance
        9. 8.3.2.9  VDD Capacitance, CVDD
        10. 8.3.2.10 Feedback Network Biasing
      3. 8.3.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 VDD Pin
      2. 10.1.2 VS Pin
      3. 10.1.3 FB Pin
      4. 10.1.4 GND Pin
      5. 10.1.5 CS Pin
      6. 10.1.6 DRV Pin
      7. 10.1.7 HV Pin
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
      2. 11.1.2 Device Nomenclature
        1. 11.1.2.1  Capacitance Terms in Farads
        2. 11.1.2.2  Duty Cycle Terms
        3. 11.1.2.3  Frequency Terms in Hertz
        4. 11.1.2.4  Current Terms in Amperes
        5. 11.1.2.5  Current and Voltage Scaling Terms
        6. 11.1.2.6  Transformer Terms
        7. 11.1.2.7  Power Terms in Watts
        8. 11.1.2.8  Resistance Terms in Ohms
        9. 11.1.2.9  Timing Terms in Seconds
        10. 11.1.2.10 Voltage Terms in Volts
        11. 11.1.2.11 AC Voltage Terms in VRMS
        12. 11.1.2.12 Efficiency Terms
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks

Package Options

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

6.7 Typical Characteristics

VVDD = 25 V, TJ = 25°C, unless otherwise noted.

GUID-7E65CE3C-A0C5-4881-8159-E394DF694C5E-low.png
HV = Open
Figure 6-1 Bias-Supply Current vs. Bias-Supply Voltage
GUID-73DA4ECD-3684-4BFA-AE8A-1D7A0E746B42-low.png
VHV = 100 V, VVDD = 0 V
Figure 6-3 HV Startup Current vs. Temperature
GUID-267B9BC7-D85A-46D0-BF80-0EFE8B7D4C86-low.pngFigure 6-5 Minimum CS Threshold vs. Temperature
GUID-236E347E-2A93-41E8-8245-130F0C84C723-low.pngFigure 6-7 Minimum Switching Frequency vs. Temperature
GUID-6F488945-DBCB-4322-8110-3139760DF391-low.pngFigure 6-9 FB Input Voltage vs. FB Input Current
GUID-8B48FF8C-4BBE-4C72-BB97-43D364CE8E0C-low.png
HV = Open
Figure 6-2 Bias-Supply Current vs. Temperature
GUID-9A23F83B-CEED-47DF-9CD5-64DA2A1B0785-low.pngFigure 6-4 VS Line-Sense Currents vs. Temperature
GUID-3802D469-0E0E-4BA4-8A8D-C7F7EEE106BE-low.pngFigure 6-6 Constant-Current Regulation Factor vs. Temperature
GUID-FC8F438D-27F3-4F14-807A-572C7EBE75F5-low.png
VDRV = 8 V, VVDD = 9 V
Figure 6-8 DRV Source Current vs. Temperature
GUID-14D0C2C8-A070-4870-ABA8-1E74AE4C96FC-low.pngFigure 6-10 VS Overvoltage Threshold vs. Temperature