SNVSBY8 March   2021 TPS92391

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 Logic Interface Characteristics
    7. 6.7 Timing Requirements for I2C Interface
    8.     14
    9. 6.8 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 Control Interface
      2. 7.3.2 Function Setting
      3. 7.3.3 Device Supply (VDD)
      4. 7.3.4 Enable (EN)
      5. 7.3.5 Charge Pump
      6. 7.3.6 Boost Controller
        1. 7.3.6.1 Boost Cycle-by-Cycle Current Limit
        2. 7.3.6.2 Controller Min On/Off Time
        3. 7.3.6.3 Boost Adaptive Voltage Control
          1. 7.3.6.3.1 FB Divider Using Two-Resistor Method
          2. 7.3.6.3.2 FB Divider Using Three-Resistor Method
          3. 7.3.6.3.3 FB Divider Using External Compensation
        4. 7.3.6.4 Boost Sync and Spread Spectrum
        5. 7.3.6.5 Light Load Mode
      7. 7.3.7 LED Current Sinks
        1. 7.3.7.1 LED Output Current Setting
        2. 7.3.7.2 LED Output String Configuration
        3. 7.3.7.3 LED Output PWM Clock Generation
      8. 7.3.8 Brightness Control
        1. 7.3.8.1 Brightness Control Signal Path
        2. 7.3.8.2 Dimming Mode
        3. 7.3.8.3 LED Dimming Frequency
        4. 7.3.8.4 Phase-Shift PWM Mode
        5. 7.3.8.5 Hybrid Mode
        6. 7.3.8.6 Direct PWM Mode
        7. 7.3.8.7 Sloper
        8. 7.3.8.8 PWM Detector Hysteresis
        9. 7.3.8.9 Dither
      9. 7.3.9 Protection and Fault Detections
        1. 7.3.9.1 Supply Faults
          1. 7.3.9.1.1 VIN Undervoltage Faults (VINUVLO)
          2.        51
          3. 7.3.9.1.2 VIN Overvoltage Faults (VINOVP)
          4. 7.3.9.1.3 VDD Undervoltage Faults (VDDUVLO)
          5. 7.3.9.1.4 VIN OCP Faults (VINOCP)
            1. 7.3.9.1.4.1 VIN OCP Current Limit vs. Boost Cycle-by-Cycle Current Limit
          6. 7.3.9.1.5 Charge Pump Faults (CPCAP, CP)
          7. 7.3.9.1.6 CRC Error Faults (CRCERR)
        2. 7.3.9.2 Boost Faults
          1. 7.3.9.2.1 Boost Overvoltage Faults (BSTOVPL, BSTOVPH)
          2. 7.3.9.2.2 Boost Overcurrent Faults (BSTOCP)
          3. 7.3.9.2.3 LEDSET Resistor Missing Faults (LEDSET)
          4. 7.3.9.2.4 MODE Resistor Missing Faults (MODESEL)
          5. 7.3.9.2.5 FSET Resistor Missing Faults (FSET)
          6. 7.3.9.2.6 ISET Resistor Out of Range Faults (ISET)
          7. 7.3.9.2.7 Thermal Shutdown Faults (TSD)
        3. 7.3.9.3 LED Faults
          1. 7.3.9.3.1 Open LED Faults (OPEN_LED)
          2. 7.3.9.3.2 Short LED Faults (SHORT_LED)
          3. 7.3.9.3.3 LED Short to GND Faults (GND_LED)
          4. 7.3.9.3.4 Invalid LED String Faults (INVSTRING)
          5. 7.3.9.3.5 I2C Timeout Faults
        4. 7.3.9.4 Overview of the Fault and Protection Schemes
    4. 7.4 Device Functional Modes
      1. 7.4.1  State Diagram
      2. 7.4.2  Shutdown
      3. 7.4.3  Device Initialization
      4. 7.4.4  Standby Mode
      5. 7.4.5  Power-line FET Soft Start
      6. 7.4.6  Boost Start-Up
      7. 7.4.7  Normal Mode
      8. 7.4.8  Fault Recovery
      9. 7.4.9  Latch Fault
      10. 7.4.10 Start-Up Sequence
    5. 7.5 Programming
      1. 7.5.1 I2C-Compatible Interface
      2. 7.5.2 Programming Examples
        1. 7.5.2.1 General Configuration Registers
        2. 7.5.2.2 Clearing Fault Interrupts
        3. 7.5.2.3 Disabling Fault Interrupts
        4. 7.5.2.4 Diagnostic Registers
    6. 7.6 Register Maps
      1. 7.6.1 FullMap Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Full Feature Application for Display Backlight
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Inductor Selection
          2. 8.2.1.2.2  Output Capacitor Selection
          3. 8.2.1.2.3  Input Capacitor Selection
          4. 8.2.1.2.4  Charge Pump Output Capacitor
          5. 8.2.1.2.5  Charge Pump Flying Capacitor
          6. 8.2.1.2.6  Output Diode
          7. 8.2.1.2.7  Switching FET
          8. 8.2.1.2.8  Boost Sense Resistor
          9. 8.2.1.2.9  Power-Line FET
          10. 8.2.1.2.10 Input Current Sense Resistor
          11. 8.2.1.2.11 Feedback Resistor Divider
          12. 8.2.1.2.12 Critical Components for Design
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Application With Basic/Minimal Operation
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
      3. 8.2.3 SEPIC Mode Application
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
          1. 8.2.3.2.1  Inductor Selection
          2. 8.2.3.2.2  Coupling Capacitor Selection
          3. 8.2.3.2.3  Output Capacitor Selection
          4. 8.2.3.2.4  Input Capacitor Selection
          5. 8.2.3.2.5  Charge Pump Output Capacitor
          6. 8.2.3.2.6  Charge Pump Flying Capacitor
          7. 8.2.3.2.7  Switching FET
          8. 8.2.3.2.8  Output Diode
          9. 8.2.3.2.9  Switching Sense Resistor
          10. 8.2.3.2.10 Power-Line FET
          11. 8.2.3.2.11 Input Current Sense Resistor
          12. 8.2.3.2.12 Feedback Resistor Divider
          13. 8.2.3.2.13 Critical Components for Design
        3. 8.2.3.3 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 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information
8.2.3.2.13 Critical Components for Design

Figure 8-7 shows the critical part of circuitry: SEPIC components, the TPS92391 internal charge pump for gate-driver powering, and powering/grounding of TPS92391. Schematic example is shown below.

GUID-20210305-CA0I-7HLW-ZPKL-BHBQKL3RZ09N-low.gif Figure 8-7 SEPIC Mode with Three LEDs in Series
Table 8-7 Recommended Components for SEPIC Design Example
REFERENCE DESIGNATORDESCRIPTIONNOTE
RISENSE20 mΩ, 1 WInput current sensing resistor
RSD20 kΩ, 0.1 WPower-line FET gate pullup resistor
RSENSE50 mΩ, 1 WBoost current sensing resistor
RG15 Ω, 0.1 WGate resistor to control the rising/falling time of nMOSFET for EMC
RUVLO176.8 kΩ, 0.1 WThese UVLO resistor settings set the VIN_UVLO rising voltage at 3.75 V, VIN_UVLO falling voltage at 3.35 V
RUVLO220.5 kΩ, 0.1 W
RFB260 kΩ, 0.1 WBottom feedback divider resistor
RFB1330 kΩ, 0.1 WTop feedback divider resistor
RBST_FSET124 kΩ, 0.1 WBoost frequency set resistor (2200 kHz)
RISET38.7 kΩ, 0.1 WCurrent set resistor (80 mA per channel)
RPWM_FSET4.75 kΩ, 0.1 WOutput PWM frequency set resistor (305-Hz PWM frequency)
RMODE3.92 kΩ, 0.1 WMode resistor (Phase-Shift PWM mode with 0x2B I2C address)
RLED_SET4.75 kΩ, 0.1 WLED_SET resistor (5 channels configuration)
CPUMP10-µF, 10-V ceramicCharge-pump output capacitor
C2X2.2-µF, 10-V ceramicFlying capacitor
CVDD4.7-µF + 0.1-µF, 10-V ceramicVDD bypass capacitor
CIN1 × 33-µF, 50-V electrolytic + 1 × 10-µF, 50-V ceramicBoost input capacitor
COUT1 × 33-µF, 50-V electrolytic + 1 × 10-µF, 50-V ceramicBoost output capacitor
CS110-µF, 50-V ceramicSEPIC coupling capacitor
CS233-µF, 50-V electrolyticSEPIC coupling capacitor
RS2 Ω, 0.125 WSEPIC resistor
L14.7-µH saturation current 3 ASEPIC inductor
L24.7-µH saturation current 3 ASEPIC inductor
D150-V 10-A Schottky diodeSEPIC Schottky diode
Q160-V, 25-A nMOSFETSEPIC nMOSFET
Q260-V, 30-A pMOSFETPower-line FET