SLUSA29D April   2010  – August 2015 UCC28250

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 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  VDD (5/12)
      2. 7.3.2  VREF (Reference Generator) (20/7)
      3. 7.3.3  EN (Enable Pin) (18/5)
      4. 7.3.4  RT (Oscillator Frequency Set and Synchronization) (15/2)
      5. 7.3.5  SP (Synchronous Rectifier Turnoff to Primary Output Turnon Dead Time Programming) (13/19)
      6. 7.3.6  PS (Primary Output Turnoff to Synchronous Rectifier Turnon Dead Time Programming) (11/18)
      7. 7.3.7  RAMP/CS (PWM Ramp Input or Current Sense Input) (16/3)
        1. 7.3.7.1 RAMP: Voltage Mode Control With Feed-Forward Operation
        2. 7.3.7.2 CS: Current Mode Control
      8. 7.3.8  REF/EA+ (1/8)
      9. 7.3.9  FB/EA- (2/9)
      10. 7.3.10 COMP (3/10)
      11. 7.3.11 VSENSE (14/1)
      12. 7.3.12 SS (Soft Start Programming Pin) (13/20)
      13. 7.3.13 ILIM (Current Limit for Cycle-By-Cycle Overcurrent Protection) (17/4)
      14. 7.3.14 HICC (10/17)
      15. 7.3.15 OVP/OTP (19/6)
      16. 7.3.16 OUTA (9/16) and OUTB (8/15)
      17. 7.3.17 SRA (7/14) and SRB (6/13)
      18. 7.3.18 GND (4/11)
    4. 7.4 Device Functional Modes
  8. 8 Applications and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Error Amplifier and PWM Generation
      2. 8.1.2 Prebiased Start-Up
        1. 8.1.2.1 Secondary-Side Control
        2. 8.1.2.2 Primary-Side Control
        3. 8.1.2.3 Voltage Mode Control and Input Voltage Feed-Forward
          1. 8.1.2.3.1 Condition 1
          2. 8.1.2.3.2 Condition 2
          3. 8.1.2.3.3 Condition 3
        4. 8.1.2.4 Peak Current Mode Control
        5. 8.1.2.5 Cycle-by-Cycle Current Limit and Hiccup Mode Protection
    2. 8.2 Typical Applications
      1. 8.2.1 Design Example
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Step 1, Power Stage Design
          2. 8.2.1.2.2 Step 2, Feedback Loop Design
          3. 8.2.1.2.3 Step 3, Programming the Device
            1. 8.2.1.2.3.1 Step 3-1
            2. 8.2.1.2.3.2 Step 3-2, Determine RAMP Resistance and Capacitance
          4. 8.2.1.2.4 Step 3-3, Determine Soft-Start Capacitance
          5. 8.2.1.2.5 Step 3-4, Determine Dead-Time Resistance
          6. 8.2.1.2.6 Step 3-5, Determine OCP Hiccup Off-Time Capacitance
          7. 8.2.1.2.7 Step 3-6, Determine Primary-Side OVP Resistance
          8. 8.2.1.2.8 Step 3-7, Select Capacitance for VDD and VREF
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Secondary-Side Half-Bridge Controller with Synchronous Rectification
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Protection
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

11 Device and Documentation Support

11.1 Documentation Support

11.1.1 Related Documentation

For related documentation see the following:

  • Designing UCC28250 as a Secondary Side Control for Output Turn-On with a Pre-Bias Condition, SLAA477
  • Using the UCC28250EVM-564, SLUU441

11.2 Community Resources

The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use.

    TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers.
    Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support.

11.3 Trademarks

E2E is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

11.4 Electrostatic Discharge Caution

esds-image

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

11.5 Glossary

SLYZ022 — TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.