SLUSA87C August   2010  – October 2015 UCC24610

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 Timing Requirements
    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 Normal Operation
      2. 7.3.2 Light-Load Operation
    4. 7.4 Device Functional Modes
      1. 7.4.1 UVLO Mode
      2. 7.4.2 Sleep Mode
      3. 7.4.3 Run Mode
      4. 7.4.4 Light-Load Mode
      5. 7.4.5 Fault Mode and Other Protections
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 VD and VS Detection
        2. 8.2.2.2 Enabling and TOFF Programming
        3. 8.2.2.3 TON Programming
        4. 8.2.2.4 GATE Drive and RGATE Considerations
        5. 8.2.2.5 VCC Range and Bypassing Considerations
        6. 8.2.2.6 SYNC Input Considerations
          1. 8.2.2.6.1 Determine the Minimum Change
          2. 8.2.2.6.2 After the ΔVDS_PRI Transition
          3. 8.2.2.6.3 The Value of CCM
          4. 8.2.2.6.4 Conservative Power-Loss Estimates
          5. 8.2.2.6.5 The Device Internal SYNC-to-GATE Delay Time
          6. 8.2.2.6.6 The CSYNC Capacitor Resets
        7. 8.2.2.7 Single-Fault Self-Protection Features
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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1 Features

  • Secondary-Side Controller Optimized for 5-V Systems
  • Up to 600-kHz Operating Frequency
  • VDS MOSFET-Sensing
  • 1.6-Ω Sink, 2.0-Ω Source Gate-Drive Impedances
  • Micro-Power Sleep Current for 90+ Designs
  • Automatic Light-Load Management
  • Synchronous Wake-Up From Sleep and Light-Load Modes
  • Protection Features on Programming Inputs
  • SYNC Input for CCM Operation
  • 20-ns Typical Turnoff Propagation Delay
  • Improved Efficiency and Design Flexibility Over Traditional Diode Solution
  • May Be Biased Directly From 5-V Output
  • Minimal Component Count

2 Applications

  • AC-to-DC 5-V Adapters
  • 5-V Bias Supplies
  • Low Voltage Rectification Circuits
  • Flyback and LLC Converters

3 Description

This GREEN Rectifier™ controller is a high-performance controller and driver for standard and logic-level N-channel MOSFET power devices used for low-voltage secondary-side synchronous rectification.

The combination of controller and MOSFET emulates a near-ideal diode rectifier. This solution not only directly reduces power dissipation of the rectifier but also indirectly reduces primary-side losses as well, due to compounding of efficiency gains.

Using drain-to-source voltage sensing, the UCC24610 is ideal for Flyback and LLC-resonant power supplies but can also be used with other power architectures. The UCC24610 is optimized for output voltages from 4.5 V to 5.5 V, and is suitable for use with lower and higher output voltages as well.

The UCC24610 offers a programmable false-triggering filter, a programmable timer to automatically switch to light-load mode at light load, and a SYNC input for optional use in continuous conduction mode (CCM) systems. Protection features on TON and EN/TOFF pins prevent run-away on-time due to open-circuit or short-circuit fault conditions.

This device is available in an 8-pin SOIC package and an 8-pin, 3.0-mm × 3.0-mm SON package with an exposed thermal pad.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
UCC24610DRB SON (8) 3.00 mm × 3.00 mm
UCC24610D SOIC (8) 4.90 mm × 3.91 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Flyback Topology

UCC24610 v10079_alt_lusa87.gif

LLC-Resonant Half Bridge

UCC24610 v10096_alt2_lusa87.gif