SLUSCX8C March   2019  – March 2021 TPS92682-Q1

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  Device Enable
      2. 7.3.2  Internal Regulator and Undervoltage Lockout (UVLO)
      3. 7.3.3  Oscillator
      4. 7.3.4  Spread Spectrum Function
      5. 7.3.5  Gate Driver
      6. 7.3.6  Rail-to-Rail Current Sense Amplifier
      7. 7.3.7  Transconductance Error Amplifier
      8. 7.3.8  Switch Current Sense
      9. 7.3.9  Slope Compensation
      10. 7.3.10 ILED Setting in CC Mode
      11. 7.3.11 Output Voltage Setting in CV Mode
      12. 7.3.12 PWM Dimming
      13. 7.3.13 P-Channel FET Gate Driver Output
      14. 7.3.14 Soft Start
      15. 7.3.15 Two-Phase Operation
        1. 7.3.15.1 Current Sharing In Two-Phase
      16. 7.3.16 Faults and Diagnostics
        1. 7.3.16.1  Main Fault Timer (MFT)
        2. 7.3.16.2  OV Fault
        3. 7.3.16.3  UV Fault
        4. 7.3.16.4  ILIM Fault
        5. 7.3.16.5  UVLO
        6. 7.3.16.6  ILED Over Current (OC)
        7. 7.3.16.7  ILED Undercurrent (UC)
        8. 7.3.16.8  ISNOPEN, FBOPEN, and RTOPEN Faults
        9. 7.3.16.9  TW and TSD
        10. 7.3.16.10 COMPx Pull-Down and Comp-Low signal
    4. 7.4 Device Functional Modes
      1. 7.4.1 POR Mode
      2. 7.4.2 Normal Operation
      3. 7.4.3 Limp Home
    5. 7.5 Programming
      1. 7.5.1 Serial Interface
      2. 7.5.2 Command Frame
      3. 7.5.3 Response Frame
        1. 7.5.3.1 Read Response Frame Format
        2. 7.5.3.2 Write Response Frame Format
        3. 7.5.3.3 Write Error/POR Frame Format
      4. 7.5.4 SPI Error
    6. 7.6 TPS92682 Registers
      1. 7.6.1  EN Register
      2. 7.6.2  CFG1 Register
      3. 7.6.3  CFG2 Register
      4. 7.6.4  SWDIV Register
      5. 7.6.5  ISLOPE Register
      6. 7.6.6  FM Register
      7. 7.6.7  SOFTSTART Register
      8. 7.6.8  CH1IADJ Register
      9. 7.6.9  CH2IADJ Register
      10. 7.6.10 PWMDIV Register
      11. 7.6.11 CH1PWML Register
      12. 7.6.12 CH1PWMH Register
      13. 7.6.13 CH2PWML Register
      14. 7.6.14 CH2PWMH Register
      15. 7.6.15 ILIM Register
      16. 7.6.16 IFT Register
      17. 7.6.17 MFT Register
      18. 7.6.18 FLT1 Register (read only)
      19. 7.6.19 FLT2 Register (read only)
      20. 7.6.20 FEN1 Register
      21. 7.6.21 FEN2 Register
      22. 7.6.22 FLATEN Register
      23. 7.6.23 OV Register
      24. 7.6.24 LHCFG Register
      25. 7.6.25 LHCH1IADJ Register
      26. 7.6.26 LHCH2IADJ Register
      27. 7.6.27 LHCH1PWML Register
      28. 7.6.28 LHCH1PWMH Register
      29. 7.6.29 LHCH2PWML Register
      30. 7.6.30 LHCH2PWMH Register
      31. 7.6.31 LHILIM Register
      32. 7.6.32 LHIFT Register
      33. 7.6.33 LHMFT Register
      34. 7.6.34 LHFEN1 Register
      35. 7.6.35 LHFEN2 Register
      36. 7.6.36 LHFLATEN Register
      37. 7.6.37 LHOV Register
      38. 7.6.38 CAL Register
      39. 7.6.39 RESET Register
  8. 8 Application and Implementation
    1. 8.1 Application Information General Design Considerations
      1. 8.1.1 Switching Frequency, fSW
      2. 8.1.2 Duty Cycle Considerations
      3. 8.1.3 Main Power MOSFET Selection
      4. 8.1.4 Rectifier Diode Selection
      5. 8.1.5 Switch Current Sense Resistor
      6. 8.1.6 Slope Compensation
      7. 8.1.7 Soft Start
    2. 8.2 Application Information CC Mode
      1. 8.2.1 Inductor Selection
      2. 8.2.2 Output Capacitor Selection
      3. 8.2.3 Input Capacitor Selection
      4. 8.2.4 Programming LED Current
      5. 8.2.5 Feedback Compensation
      6. 8.2.6 Overvoltage and Undervoltage Protection
      7. 8.2.7 Series P-Channel MOSFET Selection
      8. 8.2.8 Programming Example for Two-Channel CC Mode
    3. 8.3 Typical Application CV Mode
      1. 8.3.1 Inductor Selection
      2. 8.3.2 Output Capacitor Selection
      3. 8.3.3 Input Capacitor Selection
      4. 8.3.4 Programming Output Voltage VOUT
      5. 8.3.5 Feedback Compensation
      6. 8.3.6 Overvoltage and Undervoltage Protection
      7. 8.3.7 Programing Example for Two-Phase CV BOOST
    4. 8.4 Typical Application CC Mode
      1. 8.4.1 CC Boost Design Requirements
      2. 8.4.2 CC Boost Detailed Design Procedure
        1. 8.4.2.1  Calculating Duty Cycle
        2. 8.4.2.2  Setting Switching Frequency
        3. 8.4.2.3  Setting Dither Modulation Frequency
        4. 8.4.2.4  Inductor Selection
        5. 8.4.2.5  Output Capacitor Selection
        6. 8.4.2.6  Input Capacitor Selection
        7. 8.4.2.7  Main N-Channel MOSFET Selection
        8. 8.4.2.8  Rectifier Diode Selection
        9. 8.4.2.9  Setting ILED and Selecting RCS
        10. 8.4.2.10 Setting Switch Current Limit
        11. 8.4.2.11 Slope Compensation
        12. 8.4.2.12 Compensator Parameters
        13. 8.4.2.13 Overvoltage Protection
        14. 8.4.2.14 Series P-Channel MOSFET Selection
      3. 8.4.3 CC Buck-Boost Design Requirements
      4. 8.4.4 CC Buck-Boost Detailed Design Procedure
        1. 8.4.4.1  Calculating Duty Cycle
        2. 8.4.4.2  Setting Switching Frequency
        3. 8.4.4.3  Setting Dither Modulation Frequency
        4. 8.4.4.4  Inductor Selection
        5. 8.4.4.5  Output Capacitor Selection
        6. 8.4.4.6  Input Capacitor Selection
        7. 8.4.4.7  Main N-Channel MOSFET Selection
        8. 8.4.4.8  Rectifier Diode Selection
        9. 8.4.4.9  Setting ILED and Selecting RCS
        10. 8.4.4.10 Setting Switch Current Limit
        11. 8.4.4.11 Slope Compensation
        12. 8.4.4.12 Compensator Parameters
        13. 8.4.4.13 Overvoltage Protection
      5. 8.4.5 PWM Dimming Consideration
      6. 8.4.6 Application Curves
    5. 8.5 Typical Application CV Mode
      1. 8.5.1 CV Design Requirements
      2. 8.5.2 Detailed Design Procedure
        1. 8.5.2.1  Calculating Duty Cycle
        2. 8.5.2.2  Setting Switching Frequency
        3. 8.5.2.3  Setting Dither Modulation Frequency
        4. 8.5.2.4  Inductor Selection
        5. 8.5.2.5  Output Capacitor Selection
        6. 8.5.2.6  Input Capacitor Selection
        7. 8.5.2.7  Main N-Channel MOSFET Selection
        8. 8.5.2.8  Rectifier Diode Selection
        9. 8.5.2.9  Programming VOUT
        10. 8.5.2.10 Setting Switch Current Limit
        11. 8.5.2.11 Slope Compensation
        12. 8.5.2.12 Compensator Parameters
        13. 8.5.2.13 Overvoltage Protection
      3. 8.5.3 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 Receiving Notification of Documentation Updates
    2. 11.2 Support 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

7.3.16.2 OV Fault

If CHxOVEN is set to "1" in the FEN1 Register, the output over voltage fault is enabled. When VFBx exceeds the threshold voltage OVTHR, the CHx_OV fault is set high and turns off the associated channel. The OVTHR voltage is set by OV_DAC; OVTHR = VFBREF × OV%, where OV% is provided in the OV Register. The VFBREF in CC mode is set to 1.228 V (typical), and in CV mode, is set to the output of the CHxIADJ register. When CHx_OV is high, OVTHR is set to VFBREF and a 20 µA hysteresis current is applied to the feedback resistor divider. For the boost converter with the output voltage sensing according to Figure 7-15, VOUT must decrease to a level shown in Equation 6 for the CHx_OV to be cleared.

Equation 6. GUID-7D43FD46-2847-4BF5-9419-C26A8A6414D1-low.gif
GUID-DBC24B44-F716-4B3D-B914-84F22EEE0FA0-low.gifFigure 7-15 OV and UV Faults

If the CHxOVFL bit is set to "1" in the FLATEN Register, the OV fault is configured as a latched fault and the associated channel turns off with the rising edge of CHx_OV. The channel can be turned on again only by re-setting the CHxEN bit in the EN Register.

For CHxOVFL = 0, the OV fault is a non-latched fault. In this case, the associated channel turns off when the OV fault occurs, but the channel goes through a restart and soft-start ramp when CHx_OV goes low. Figure 7-16 shows a non-latched OV situation for a converter in CV mode, where the output voltage (VFBx) is regulated to VFBREF in normal condition.

GUID-1BF1B5B9-C870-4EC0-9AC5-8DF37BEB8F0E-low.gifFigure 7-16 Non-latched OV Fault in CV Mode