SLIS178B October   2017  – January 2018 TPS92830-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Simplified Schematic
  4. 4 Revision History
  5. 5 Description (Continued)
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 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 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Device Bias
        1. 8.3.1.1 Power-On-Reset (POR)
        2. 8.3.1.2 Current Reference (IREF)
        3. 8.3.1.3 Low-Current Fault Mode
      2. 8.3.2 Charge Pump
        1. 8.3.2.1 Charge Pump Architecture
      3. 8.3.3 Constant-Current Driving
        1. 8.3.3.1 High-Side Current Sense
        2. 8.3.3.2 High-Side Current Driving
        3. 8.3.3.3 Gate Overdrive Voltage Protection
        4. 8.3.3.4 High-Precision Current Regulation
        5. 8.3.3.5 Parallel MOSFET Driving
      4. 8.3.4 PWM Dimming
        1. 8.3.4.1 Supply Dimming
        2. 8.3.4.2 PWM Dimming by Input
        3. 8.3.4.3 Internal Precision PWM Generator
        4. 8.3.4.4 Full Duty-Cycle Switch
      5. 8.3.5 Analog Dimming
        1. 8.3.5.1 Analog Dimming Topology
        2. 8.3.5.2 Internal High-Precision Pullup Current Source
      6. 8.3.6 Output Current Derating
        1. 8.3.6.1 Output-Current Derating Topology
      7. 8.3.7 Diagnostics and Fault
        1. 8.3.7.1 LED Short-to-GND Detection
        2. 8.3.7.2 LED Short-to-GND Auto Retry
        3. 8.3.7.3 LED Open-Circuit Detection
        4. 8.3.7.4 LED Open-Circuit Auto Retry
        5. 8.3.7.5 Dropout-Mode Diagnostics
        6. 8.3.7.6 Overtemperature Protection
        7. 8.3.7.7 FAULT Bus Output With One-Fails–All-Fail
        8. 8.3.7.8 Fault Table
    4. 8.4 Device Functional Modes
      1. 8.4.1 Undervoltage Lockout, V(IN) < V(UVLO)
      2. 8.4.2 Normal Operation (V(IN) ≥ 4.5 V, V(IN) > V(LED) + 0.5 V)
      3. 8.4.3 Low-Voltage Dropout
      4. 8.4.4 Fault Mode (Fault Is Detected)
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Typical Application for Automotive Exterior Lighting With One-Fails–All-Fail
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 High-Precision Dual-Brightness PWM Generation
        1. 9.2.2.1 Dual-Brightness Application
        2. 9.2.2.2 Design Requirements
        3. 9.2.2.3 Detailed Design Procedure
        4. 9.2.2.4 Application Curve
      3. 9.2.3 Driving High-Current LEDs With Parallel MOSFETs
        1. 9.2.3.1 Application Curves
  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 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

8.3.7.8 Fault Table

Table 3. Fault Table With DIAGEN = HIGH

FAULT TYPE DETECTION MECHANISM CHANNEL STATE DEGLITCH TIME FAULT BUS FAULT HANDLING ROUTINE FAULT RECOVERY
FAULT FLOATING
LED open-circuit VISNx – VSENSEx < V(OPEN_th_rising) On t(OPEN_deg) Constant-current pulldown All channels turned off. Pulsed pullup retry of faulty channel. Auto recover
LED short-to-GND VSENSEx < V(SG_th_rising) On t(SG_deg) All channels turned off. Pulsed pullup retry of faulty channel.
LED short-to-battery VISNx – VSENSEx < V(OPEN_th_rising) On or off t(OPEN_deg) All channels turned off. Faulty channel pulsed pullup retry of faulty channel.
Overtemperature TJ > T(TSD) On or off All channels turned off.
FAULT EXTERNALLY PULLED UP
LED open-circuit VISNx – V SENSEx < V(OPEN_th_rising) On t(OPEN_deg) Externally pulled up with internal constant-current pulldown Only faulty channel turned off. Pulsed pullup retry of faulty channel. Auto recover
LED short-to-GND V SENSEx < V(SG_th_rising) On t(SG_deg) Only faulty channel turned off. Pulsed pullup retry of faulty channel.
LED short-to-battery V ISNx – V(SENSEx) < V(OPEN_th_rising) On or off t(OPEN_deg) Only faulty channel turned off. Pulsed pullup retry of faulty channel.
Overtemperature TJ > T(TSD) On or off All channels turned off.
FAULT EXTERNALLY PULLED DOWN
All outputs disabled

Table 4. Fault Table With DIAGEN = LOW

FAULT TYPE DETECTION MECHANISM CHANNEL STATE DEGLITCH TIME FAULT BUS FAULT HANDLING ROUTINE FAULT RECOVERY
FAULT FLOATING
LED open-circuit Ignored Ignored Ignored Ignored Ignored Ignored
LED short-to-GND V(SENSEx) < V(SG_th_rising) On t(SG_deg) Constant current pull down All channels turned off. Pulsed pullup retry of faulty channel. Auto recover
LED short-to-battery Ignored Ignored Ignored Ignored Ignored Ignored
Overtemperature TJ > T(TSD) On or off Constant current pull down All channels turned off. Auto recover
FAULT EXTERNALLY PULLED UP
LED open-circuit Ignored Ignored Ignored Ignored Ignored Ignored
LED short-to-GND V(SENSEx) < V(SG_th_rising) On t(SG_deg) Externally pulled up with internal constant current pulled down Only faulty channel turned off. Pulsed pullup retry of faulty channel. Auto recover
LED short-to-battery Ignored Ignored Ignored Ignored Ignored Ignored
Overtemperature TJ > T(TSD) On or off Externally pulled up with internal constant current pulled down All channels turned off. Auto recover
FAULT EXTERNALLY PULLED LOW
All outputs disabled All outputs disabled All outputs disabled All outputs disabled All outputs disabled All outputs disabled All outputs disabled