SLUSD37E October   2017  – November 2019 UCC28056

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     No Load Power
      1.      Device Images
        1.       Simplified Application
  4. 4 Revision History
  5. 5 Device Comparison Tables
  6. 6 Pin Configuration and Functions
    1.     Pin 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 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 CrM/DCM Control Principle
      2. 8.3.2 Line Voltage Feed-Forward
        1. 8.3.2.1 Peak Line Voltage Detection
      3. 8.3.3 Valley Switching and CrM/DCM Hysteresis
        1. 8.3.3.1 Valley Delay Adjustment
      4. 8.3.4 Transconductance Amplifier with Transient Speed-up Function
      5. 8.3.5 Faults and Protections
        1. 8.3.5.1 Supply Undervoltage Lockout
        2. 8.3.5.2 Two Level Over-Current Protection
          1. 8.3.5.2.1 Cycle-by-Cycle Current Limit Ocp1
          2. 8.3.5.2.2 Ocp2 Gross Over-Current or CCM Protection
        3. 8.3.5.3 Output Over-Voltage Protection
          1. 8.3.5.3.1 First Level Output Over-Voltage Protection (Ovp1)
          2. 8.3.5.3.2 Second Level Over-Voltage Protection (Ovp2)
        4. 8.3.5.4 Thermal Shutdown Protection
        5. 8.3.5.5 Line Under-Voltage or Brown-In
      6. 8.3.6 High-Current Driver
    4. 8.4 Controller Functional Modes
      1. 8.4.1 Burst Mode Operation
      2. 8.4.2 Soft Start
  9. 9 Application 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 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Power Stage Design
          1. 9.2.2.2.1 Boost Inductor Design
          2. 9.2.2.2.2 Boost Switch Selection
          3. 9.2.2.2.3 Boost Diode Selection
          4. 9.2.2.2.4 Output Capacitor Selection
        3. 9.2.2.3 ZCD/CS Pin
          1. 9.2.2.3.1 Voltage Spikes on the ZCD/CS pin Waveform
        4. 9.2.2.4 VOSNS Pin
        5. 9.2.2.5 Voltage Loop Compensation
          1. 9.2.2.5.1 Plant Model
          2. 9.2.2.5.2 Compensator Design
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 VOSNS Pin
      2. 11.1.2 ZCD/CS Pin
      3. 11.1.3 VCC Pin
      4. 11.1.4 GND Pin
      5. 11.1.5 DRV Pin
      6. 11.1.6 COMP Pin
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Custom Design With WEBENCH® Tools
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

5 Device Comparison Tables

DEVICE UCC28056 UCC28056A UCC28056B UCC28056C
Target Applications Not recommended for new design PFC Bus output >400VDC Improved audible noise performance Drop in replacement for UCC28056
OVP2 FEATURE INCLUDED YES NO YES YES
OVP1 THRESHOLD 110% Vout 108% Vout 110% Vout 110% Vout
BURST MODE THRESHOLD < 10% Load < 15% Load < 15% Load < 10% Load
ZCD NOISE IMMUNITY Basic noise immunity Improved noise immunity Improved noise immunity Improved noise immunity

The enhanced noise immunity of UCC28056A, UCC28056B, and UCC28056C provides system robustness advantages and less sensitivity to PCB layout than the UCC28056. For more information on the system level benefits that UCC28056A, UCC28056B and UCC28056C provide, please see UCC28056X Selection Guide SLUA974.

PARAMETER DEVICE MIN TYP MAX UNIT
Output Over Voltage Protection
VOSOvp1Rise VOSNS over-voltage threshold, rising, VCC = 12 V UCC28056A 2.64 2.7 2.76 V
UCC28056 2.69 2.75 2.81
UCC28056B
UCC28056C
VOSOvp1Fall VOSNS over-voltage threshold, falling, VCC = 12 V UCC28056A 2.55 2.625 2.68 V
UCC28056 2.60 2.675 2.73
UCC28056B
UCC28056C
VOSOvp1Hyst VOSOovp1Rise - VOSOovp1Fall All 0.072 V
TOvp2Blk Ovp2 Comparator output is blanked for this period after falling edge of DRV UCC28056A Not Applicable
UCC28056 520 620 720 ns
UCC28056B
UCC28056C
TOvp2bEn Ovp2b fault is detected if ZCD is detected during this period after falling edge of Ovp2 Comparator output UCC28056A Not Applicable
UCC28056 620 720 820 ns
UCC28056B
UCC28056C
VOvp2Th Second level output over-voltage fault Threshold UCC28056A Not Applicable
UCC28056 1.102 1.125 1.148 ns
UCC28056B
UCC28056C
Burst Mode Operation
VBSTFall VCOMP Burst Threshold Falling UCC28056 0.5 V
UCC28056C
UCC28056A 0.75
UCC28056B
VBSTRise VCOMP Burst Threshold Rising UCC28056 0.625
UCC28056C
UCC28056A 0.875
UCC28056B