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

8.3.1 Design Requirements

Table 8-1 Design Parameters
PARAMETERNOTES AND CONDITIONSMINNOMMAXUNIT
INPUT CHARACTERISTICS
Input Voltage, VIN85115/230265VRMS
Maximum Input CurrentVIN = VINmin, IOUT = IOUTmax0.265ARMS
Line Frequency4760/5063Hz
No Load Input Power ConsumptionVINmin ≤ VIN ≤ VINmax, IOUT = 0 A20mW
OUTPUT CHARACTERISTICS
Output Voltage, VOUTVINmin ≤ VIN ≤ VINmax, 0 A ≤ IOUT ≤ IOUTmax4.9555.05V
Output Load Current, CV Mode, IOUTmaxVINmin ≤ VIN ≤ VINmax1.9952.12.205A
Output Voltage RegulationLine Regulation: VINmin ≤ VIN ≤ VINmax, IOUT ≤ IOUTmax0.1%
Load Regulation: 0 A ≤ IOUT ≤ IOUTmax0.1%
Output Voltage RippleVINmin ≤ VIN ≤ VINmax, 0 A ≤ IOUT ≤ IOUTmax150mVpp
Output Overcurrent, ICCCVINmin ≤ VIN ≤ VINmax2.5A
Minimum Output Voltage, CC ModeVINmin ≤ VIN ≤ VINmax, IOUT = IOCC1.782V
Brown-out ProtectionIOUT = IOUTmax68VRMS
Transient Response UndershootIOUT = IOUTmax to 0-A load transient4.3V
Transient Response TimeIOUT = IOUTmax to 0-A load transient20ms
SYSTEMS CHARACTERISTICS
Switching Frequency, fSW1.271kHz
Average Efficiency25%, 50%, 75%, 100% load average at nominal input voltages81%
Operating Temperature25°C