SLUS769D July   2013  – December 2016 UCC28910 , UCC28911

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Detailed Pin Description
    1. 8.1 VDD (Device Voltage Supply)
    2. 8.2 GND (Ground)
    3. 8.3 VS (Voltage Sense)
    4. 8.4 IPK (Set the Maximum DRAIN Current Peak)
    5. 8.5 DRAIN
  9. 9 Specifications
    1. 9.1 Absolute Maximum Ratings
    2. 9.2 Storage Conditions
    3. 9.3 ESD Ratings
    4. 9.4 Recommended Operating Conditions
    5. 9.5 Thermal Information
    6. 9.6 Electrical Characteristics
    7. 9.7 Switching Characteristics
    8. 9.8 Typical Characteristics
  10. 10Detailed Description
    1. 10.1 Overview
    2. 10.2 Functional Block Diagram
    3. 10.3 Feature Description
      1. 10.3.1 Primary-Side Voltage Regulation
      2. 10.3.2 Primary-Side Current Regulation
      3. 10.3.3 Voltage Feed Forward Compensation
      4. 10.3.4 Control Law
      5. 10.3.5 Valley Switching
      6. 10.3.6 Startup Operation
      7. 10.3.7 Fault Protection
        1. 10.3.7.1 Output Over-Voltage
        2. 10.3.7.2 Input Under-Voltage
        3. 10.3.7.3 Primary Over-Current
        4. 10.3.7.4 VDD Clamp Over-Current
        5. 10.3.7.5 Thermal shutdown
      8. 10.3.8 EMI Dithering
    4. 10.4 Device Functional Modes
  11. 11Applications and Implementation
    1. 11.1 Application Information
    2. 11.2 Typical Application
      1. 11.2.1 Battery Charger, 5 V, 6 W
        1. 11.2.1.1 Design Requirements
        2. 11.2.1.2 Detailed Design Procedure
          1. 11.2.1.2.1  Power Handling Curves
          2. 11.2.1.2.2  Input Stage Design and Bulk Capacitance
          3. 11.2.1.2.3  Transformer Turns Ratio
          4. 11.2.1.2.4  Output Capacitance
          5. 11.2.1.2.5  VDD Capacitance, CVDD
          6. 11.2.1.2.6  VS Resistor Divider
          7. 11.2.1.2.7  RVDD Resistor and Turn Ratio
          8. 11.2.1.2.8  Transformer Input Power
          9. 11.2.1.2.9  RIPK Value
          10. 11.2.1.2.10 Transformer Primary Inductance Value
            1. 11.2.1.2.10.1 Secondary Diode Selection
          11. 11.2.1.2.11 Pre-Load
          12. 11.2.1.2.12 DRAIN Voltage Clamp Circuit
      2. 11.2.2 Application Curves
        1. 11.2.2.1 Average Efficiency Performance and Standby Power of the UCC28910FBEVM-526
      3. 11.2.3 Multi-Output Converter with UCC2891x Devices
      4. 11.2.4 Do’s and Don'ts
  12. 12Power Supply Recommendations
  13. 13Layout
    1. 13.1 Layout Guidelines
    2. 13.2 Layout Example
  14. 14Device and Documentation Support
    1. 14.1 Documentation Support
      1. 14.1.1 Device Nomenclature
        1. 14.1.1.1 Definition of Terms
      2. 14.1.2 Related Documents
    2. 14.2 Trademarks
    3. 14.3 Electrostatic Discharge Caution
    4. 14.4 Glossary
    5. 14.5 Related Links
  15. 15Mechanical, Packaging, and Orderable Information

Package Options

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

13 Layout

13.1 Layout Guidelines

In order to increase the reliability and feasibility of the project it is recommended to follow the here below guidelines.

  1. Place the RIPK resistance as close as possible to the device with the shortest available traces.
  2. Try to minimize the area of DRAIN trace, this helps in keeping EMI disturbance low.
  3. A copper area connected to the GND pins improves heat sinking thermal performance.
  4. A copper area connected to anode and cathode secondary diode improves heat sinking with an emphasis on the quiet area of the diode, the diode connected to the output capacitor, this limits the EMI disturbance.
  5. Place the auxiliary voltage sense resistor divider (RS1 and RS2 in Figure 52) directly on the VS pin keeping traces as short as possible.

13.2 Layout Example

UCC28910 UCC28911 testsetup_lus769.gif Figure 52. UCC28910 Layout Example