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

8.3.1.1 Power-On-Reset (POR)

The TPS92830-Q1 device has an internal power-on-reset (POR) function. When power is applied to IN, the internal POR holds the device in the reset condition until VIN reaches V(POR_rising).

When the supply rises above POR threshold V(POR_rising), the charge pump starts working. The maximum gate-drive voltage is determined by the charge-pump voltage between CPOUT and IN.