SLUSFF2 October   2024 UCG28826

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Detailed Pin Descriptions
      1. 6.3.1  HV - High Voltage Input
      2. 6.3.2  SW - Switch Node
      3. 6.3.3  GND – Ground Return
      4. 6.3.4  FLT - External Overtemperature Fault
      5. 6.3.5  FB ­­– Feedback
      6. 6.3.6  TR - Turns Ratio
      7. 6.3.7  IPK - Peak Current and Dithering
      8. 6.3.8  FCL - Frequency clamp and fault response
      9. 6.3.9  CDX - CCM, drive strength and X-cap discharge
      10. 6.3.10 VCC - Input Bias
    4. 6.4 Feature Description
      1. 6.4.1  Self Bias and Auxless Sensing
      2. 6.4.2  Control Law
        1. 6.4.2.1 Valley Switching
        2. 6.4.2.2 Frequency Foldback
        3. 6.4.2.3 Burst Mode
        4. 6.4.2.4 Continuous Conduction Mode (CCM)
      3. 6.4.3  GaN HEMT Switching Capability
      4. 6.4.4  Soft Start
      5. 6.4.5  Frequency Clamp
      6. 6.4.6  Frequency Dithering
      7. 6.4.7  Slew Rate Control
      8. 6.4.8  Transient Peak Power Capability
      9. 6.4.9  X-Cap Discharge
      10. 6.4.10 Fault Protections
        1. 6.4.10.1 Brownout Protection
        2. 6.4.10.2 Short-Circuit Protection
        3. 6.4.10.3 Output Over Voltage Protection
        4. 6.4.10.4 Over Power Protection (OPP, LPS)
        5. 6.4.10.5 Overtemperature Protection
        6. 6.4.10.6 Open FB Protection
        7. 6.4.10.7 Error Codes for Protections
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Input Bulk Capacitor
        2. 7.2.2.2 Transformer Primary Inductance and Turns Ratio
        3. 7.2.2.3 Output Capacitor
        4. 7.2.2.4 Selection Resistors
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Package Option Addendum
    2. 10.2 Mechanical Data

6.3.8 FCL - Frequency clamp and fault response

Use the FCL pin to select the maximum switching frequency clamp value and fault response behavior. Table 6-3 lists the resistor values to be used for the given operating conditions. The resistor needs to be 1% accurate.

Table 6-3 FCL Pin Programming Resistor Values
FCL Pin Resistor (kΩ) Frequency Clamp (kHz) Fault Response
0 140 EXTOTP and OVP Latched, rest Auto retry
5.23 140 All latched
6.34 200 All latched
7.68 250 All latched
9.31 500 All latched
28.7 140 EXTOTP fault and OVP Latched, rest Auto retry
36.5 200 EXTOTP fault and OVP Latched, rest Auto retry
51.1 250 EXTOTP fault and OVP Latched, rest Auto retry
75 500 EXTOTP fault and OVP Latched, rest Auto retry