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

7 Pin Configuration and Functions

D (SOIC) Package
7 Pins
(Top View)
UCC28910 UCC28911 pin_lus769.gif

Pin Functions

PIN I/O(1) DESCRIPTION
NAME NO.
DRAIN 8 P DRAIN, the drain of the internal power FET, but also the input for the high-voltage current source used to start up the device.
GND 1 G The ground pins (GND) are both the reference pins for the controller and the low-side return for the drive output. Special care should be taken to return all AC decoupling as close as possible to this pin and avoid any common trace length with analog signal return paths.
2
3
IPK 4 O IPK is used to set the maximum peak current flowing in the power FET that is proportional to the maximum output current.
N/A 7 N/A This pin is not present to provide enough distance between high voltage pin (DRAIN) and VDD pins.
VDD 6 P VDD is the supply pin to the controller. A carefully placed bypass capacitor to GND is required on this pin.
VS 5 I Voltage Sense (VS) is used to provide voltage and timing feedback to the controller. Normally this pin is connected to a voltage divider between an auxiliary winding and ground. The value of the upper resistor of this divider is used to program low line thresholds.
(1) P = Supply, G = Ground, I = Input, O = output