SLUSD90C June   2019  – March 2020 UCC256402 , UCC256403 , UCC256404

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1.     Simplified Schematic
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
    1.     Pin Functions
  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 Switching Characteristics
    7. 7.7 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Hybrid Hysteretic Control
      2. 8.3.2 Regulated 13-V Supply
      3. 8.3.3 Feedback Chain
        1. 8.3.3.1 Optocoupler Feedback Signal Input and Bias
        2. 8.3.3.2 FB Pin Voltage Clamp
        3. 8.3.3.3 "Pick Lower Value" Block and Soft Start Multiplexer
        4. 8.3.3.4 Pick Higher Block and Burst Mode Multiplexer
        5. 8.3.3.5 VCR Comparators
      4. 8.3.4 Resonant Capacitor Voltage Sensing
      5. 8.3.5 Resonant Current Sensing
      6. 8.3.6 Bulk Voltage Sensing
      7. 8.3.7 Output Voltage Sensing
      8. 8.3.8 High Voltage Gate Driver
        1. 8.3.8.1 Adaptive Dead Time Control
      9. 8.3.9 Protections
        1. 8.3.9.1 ZCS Region Prevention
        2. 8.3.9.2 Over Current Protection (OCP)
        3. 8.3.9.3 Bias Winding Over Voltage Protection (BWOVP)
        4. 8.3.9.4 Input Under Voltage Protection (VINUVP)
        5. 8.3.9.5 Input Over Voltage Protection (VINOVP)
        6. 8.3.9.6 Boot UVLO
        7. 8.3.9.7 RVCC UVLO
        8. 8.3.9.8 Over Temperature Protection (OTP)
    4. 8.4 Device Functional Modes
      1. 8.4.1 High Voltage Start-Up
      2. 8.4.2 X-Capacitor Discharge
      3. 8.4.3 Burst Mode Control
        1. 8.4.3.1 Soft-Start and Burst-Mode Threshold
        2. 8.4.3.2 BMTL/BMTH Ratio Programming
      4. 8.4.4 System State Machine
  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  LLC Power Stage Requirements
        2. 9.2.2.2  LLC Gain Range
        3. 9.2.2.3  Select Ln and Qe
        4. 9.2.2.4  Determine Equivalent Load Resistance
        5. 9.2.2.5  Determine Component Parameters for LLC Resonant Circuit
        6. 9.2.2.6  LLC Primary-Side Currents
        7. 9.2.2.7  LLC Secondary-Side Currents
        8. 9.2.2.8  LLC Transformer
        9. 9.2.2.9  LLC Resonant Inductor
        10. 9.2.2.10 LLC Resonant Capacitor
        11. 9.2.2.11 LLC Primary-Side MOSFETs
        12. 9.2.2.12 LLC Rectifier Diodes
        13. 9.2.2.13 LLC Output Capacitors
        14. 9.2.2.14 HV Pin Series Resistors
        15. 9.2.2.15 BLK Pin Voltage Divider
        16. 9.2.2.16 ISNS Pin Differentiator
        17. 9.2.2.17 VCR Pin Capacitor Divider
        18. 9.2.2.18 BW Pin Voltage Divider
        19. 9.2.2.19 Soft Start and Burst Mode Programming
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 VCC Pin Capacitor
    2. 10.2 Boot Capacitor
    3. 10.3 RVCC Pin Capacitor
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Device Comparison Table

Device Integrated High Voltage Startup Integrated X-Capacitor Discharge Requires External Bias Supply Burst Soft On and Soft Off BLK OVP BW OVP Mode
UCC256402 Yes No No No No Restart
UCC256402A Yes No No No Yes Restart
UCC256403 No No Yes Yes No Restart
UCC256404 Yes Yes No Yes No Restart
UCC256404A Yes Yes No No No Latch
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE
VCCShort Below this threshold, use reduced start up current For UCC256402, UCC256402A, UCC256404, UCC256404A 0.3 0.5 0.8 V
VCCReStartJfet Below this threshold, re-enable JFET. For UCC256402, UCC256402A, UCC256404, UCC256404A 9.35 9.65 9.95 V
VCCStartSelf Startup when VCC is above this level For UCC256402, UCC256402A, UCC256404, UCC256404A 25 26 28 V
VCCStartSwitching Startup when VCC is above this level For UCC256403 10.72 10.9 11.12 V
BULK VOLTAGE SENSE
VBLKStart BLK voltage that allows LLC to start switching For UCC256402, UCC256402A, UCC256403 2.94 3 3.06 V
For UCC256404, UCC256404A 0.98 1 1.02 V
VBLKStop BLK voltage that forces LLC operation to stop For UCC256402, UCC256402A, UCC256403 2.15 2.2 2.25 V
For UCC256404, UCC256404A 0.88 0.9 0.925 V
VBLKOVPRise BLK over voltage protection rising threshold For UCC256402A 3.92 4.0 4.08 V
VBLKOVPFall BLK over voltage protection falling threshold For UCC256402A 3.72 3.8 3.88 V
FEEDBACK PIN
IFB FB internal current source For UCC256402, UCC256402A, UCC256404, UCC256404A 73 82 91 µA
For UCC256403 147 164 182 µA
SOFT START AND BURST MODE
Nburst Minimum number of pulses in each burst packet (including burst soft on/off pulses) For UCC256403, UCC256404 40
For UCC256402, UCC256402A, UCC256404A 16