SLUSE50 November   2023 TPS92642-Q1

PRODUCTION DATA  

  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
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Internal Regulator
      2. 6.3.2  Buck Converter Switching Operation
      3. 6.3.3  Bootstrap Supply
      4. 6.3.4  Switching Frequency and Adaptive On-Time Control
      5. 6.3.5  Minimum On-Time, Off-Time, and Inductor Ripple
      6. 6.3.6  LED Current Regulation and Error Amplifier
      7. 6.3.7  Start-Up Sequence
      8. 6.3.8  Analog Dimming and Forced Continuous Conduction Mode
      9. 6.3.9  External PWM Dimming and Input Undervoltage Lockout (UVLO)
      10. 6.3.10 Pulse Duty Cycle Limit Circuit
      11. 6.3.11 Output Short and Open-Circuit Faults
      12. 6.3.12 Overcurrent Protection
      13. 6.3.13 Thermal Shutdown
      14. 6.3.14 Fault Indicator and Diagnostics Summary
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1  Duty Cycle Considerations
      2. 7.1.2  Switching Frequency Selection
      3. 7.1.3  LED Current Programming
      4. 7.1.4  Inductor Selection
      5. 7.1.5  Output Capacitor Selection
      6. 7.1.6  Input Capacitor Selection
      7. 7.1.7  Bootstrap Capacitor Selection
      8. 7.1.8  Compensation Capacitor Selection
      9. 7.1.9  Input Dropout and Undervoltage Protection
      10. 7.1.10 Pulse Duty Cycle Limit Circuit
      11. 7.1.11 Protection Diodes
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Calculating Duty Cycle
        2. 7.2.2.2 Calculating Minimum On-Time and Off-Time
        3. 7.2.2.3 Minimum Switching Frequency
        4. 7.2.2.4 LED Current Set Point
        5. 7.2.2.5 Inductor Selection
        6. 7.2.2.6 Output Capacitor Selection
        7. 7.2.2.7 Bootstrap Capacitor Selection
        8. 7.2.2.8 Compensation Capacitor Selection
        9. 7.2.2.9 VIN Dropout Protection and PWM Dimming
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 Compact Layout for EMI Reduction
          1. 7.4.1.1.1 Ground Plane
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

7.2.3 Application Curves

GUID-20231031-SS0I-PQ6Z-518P-TJBL3MSDZRRL-low.svg
Ch1: SW voltage (10 V/div); Ch2: Output voltage (1 V/div); Ch3: Inductor current (1 A/div); Ch4: VIN voltage (10 V/div); Time: 5 ms/div
Figure 7-3 Start-up Transient
GUID-20231031-SS0I-CPPK-07VL-NZVSNMMZ3DTC-low.svg
Ch1: SW voltage (5 V/div); Ch2: Output voltage (2 V/div); Ch3: Inductor current (1 A/div); Time: 5 µs/div
Figure 7-5 PWM Dimming (Rising Edge)
GUID-20231031-SS0I-6ZP4-CCKQ-DPTSGGP1T3Q6-low.svg
Ch2: Output voltage (4 V/div); Ch3: LED current (1 A/div); Ch4: FLT voltage (2 V/div); Time: 40 ms/div
Figure 7-7 Output Short-Circuit Fault
GUID-20231031-SS0I-L5BG-WS0Z-DB3SRKGQ7KWR-low.svg
Ch1: SW voltage (5 V/div); Ch2: Output voltage (2 V/div); Ch3: LED current (1 A/div); Time: 400 ns/div
Figure 7-4 Normal Operation
GUID-20231031-SS0I-QJB4-Q971-NLZP0QGPVFWW-low.svg
Ch1: SW voltage (5 V/div); Ch2: Output voltage (2 V/div); Ch3: Inductor current (1 A/div); Time: 1 µs/div
Figure 7-6 PWM Dimming (Falling Edge)
GUID-20231031-SS0I-HWFB-LSTK-6DPMPBFWMBBS-low.svg
Ch2: Output voltage (4 V/div); Ch3: LED current (1 A/div); Ch4: FLT voltage (2 V/div); Time: 40 ms/div
Figure 7-8 Output Open-Circuit Fault