SLUSB41A July   2012  – December 2014 UCC28700 , UCC28701 , UCC28702 , UCC28703

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 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 Electrical Characteristics
    6. 7.6 Switching Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Detailed Pin Description
        1. 8.3.1.1 VDD (Device Bias Voltage Supply)
        2. 8.3.1.2 GND (Ground)
        3. 8.3.1.3 VS (Voltage-Sense)
        4. 8.3.1.4 DRV (Gate Drive)
        5. 8.3.1.5 CS (Current Sense)
        6. 8.3.1.6 CBC (Cable Compensation), Pin 1 UCC28700
        7. 8.3.1.7 NTC (NTC Thermistor Shut-down), Pin 1 UCC28701/2/3
      2. 8.3.2 Fault Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Primary-Side Voltage Regulation
      2. 8.4.2 Primary-Side Current Regulation
      3. 8.4.3 Valley-Switching
      4. 8.4.4 Start-Up Operation
  9. 9 Applications 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 Transformer Parameter Verification
        2. 9.2.2.2 Output Capacitance
        3. 9.2.2.3 VDD Capacitance, CDD
        4. 9.2.2.4 VDD Start-Up Resistance, RSTR
        5. 9.2.2.5 VS Resistor Divider, Line Compensation, and Cable Compensation
        6. 9.2.2.6 Input Bulk Capacitance and Minimum Bulk Voltage
        7. 9.2.2.7 Transformer Turns Ratio, Inductance, Primary-Peak Current
        8. 9.2.2.8 Standby Power Estimate
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Device Nomenclature
        1. 12.1.1.1  Capacitance Terms in Farads
        2. 12.1.1.2  Duty Cycle Terms
        3. 12.1.1.3  Frequency Terms in Hertz
        4. 12.1.1.4  Current Terms in Amperes
        5. 12.1.1.5  Current and Voltage Scaling Terms
        6. 12.1.1.6  Transformer Terms
        7. 12.1.1.7  Power Terms in Watts
        8. 12.1.1.8  Resistance Terms in Ω
        9. 12.1.1.9  Timing Terms in Seconds
        10. 12.1.1.10 Voltage Terms in Volts
        11. 12.1.1.11 AC Voltage Terms in VRMS
        12. 12.1.1.12 Efficiency Terms
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
      2. 12.2.2 Related Links
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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10 Power Supply Recommendations

The UCC2870X family is intended for AC/DC adapters and chargers with input voltage range of 85 VAC(rms) to 265 VAC(rms) using Flyback topology. It can be used in other applications and converter topologies with different input voltages. Be sure that all voltages and currents are within the recommended operating conditions and absolute maximum ratings of the device.

To maintain output current regulation over the entire input voltage range, design the converter to operate close to fMAX when in full-load conditions.

To improve thermal performance increase the copper area connected to GND pins.