SLUSCZ1 May 2017 TPS92518-Q1

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Typical Characteristics
  7. Parameter Measurement Information
    1. 7.1CSN Pin Falling Delay (tDEL)
    2. 7.2Off-Timer (tOFF)
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1 General Operation
        1. 8.3.1.1Constant Off-Time vs. Constant µs×V operation
        2. 8.3.1.2Output Equation
        3. 8.3.1.3OFF Timer
          1. 8.3.1.3.1Off-time and Maximum Off-time Calculations
      2. 8.3.2 Important System Considerations: Off-Timer and Maximum Peak Threshold Values
        1. 8.3.2.1Peak Current Sense Comparator
        2. 8.3.2.2Peak Current Threshold - LEDx _PKTH_DAC
        3. 8.3.2.3Off-Time Thresholds - LEDx_TOFF_DAC and LEDx_MAXOFF_DAC
      3. 8.3.3 Shunt FET or Matrix dimming: Maximum Off-timer Calculation
        1. 8.3.3.1Output Ringing and TPS92518-Q1 Protection
        2. 8.3.3.2Live Peak and Off-Time Threshold Changes
      4. 8.3.4 VIN and the VCC Internal Regulators
      5. 8.3.5 Output Enable Control Logic
        1. 8.3.5.1EN/UV2 - SPI Control Bypass
      6. 8.3.6 BOOT Capacitor and BOOT UVLO
      7. 8.3.7 Drop-out Operation
        1. 8.3.7.1Early Drop-Out (Boot Capacitor Voltage >> VBOOT-UVLO)
        2. 8.3.7.2Full Drop-Out (Boot Capacitor Voltage reaching VBOOT-UVLO)
        3. 8.3.7.3Minimum BOOT Voltage and FET Control
        4. 8.3.7.4BOOT Controlled internal Pull-Down
      8. 8.3.8 Analog and PWM Dimming
        1. 8.3.8.1Dimming Methods
        2. 8.3.8.2PWMx Pin Operation
        3. 8.3.8.3PWM Dimming - Current Rise Performance
        4. 8.3.8.4PWM and Analog Dimming - Linearity Limitations and Buck Converters
          1. 8.3.8.4.1PWM:
          2. 8.3.8.4.2ANALOG:
        5. 8.3.8.5DCM Current Calculation
        6. 8.3.8.6Current Sharing
      9. 8.3.9 VIN and CSPx Pin Configuration
      10. 8.3.10Enable and Undervoltage Lock-out Configuration
      11. 8.3.11Voltage Sampling and DAC Operation
        1. 8.3.11.1ADC Control and LED Voltage Updating
      12. 8.3.12Device Functional Modes
        1. 8.3.12.1Analog Dimming
        2. 8.3.12.2PWM Dimming
    4. 8.4Serial Interface
      1. 8.4.1Command Frame
      2. 8.4.2Response Frame Formats
        1. 8.4.2.1Read Response Frame Format
        2. 8.4.2.2Write Response Frame Format
        3. 8.4.2.3Write Error/POR Frame Format
        4. 8.4.2.4SPI Error
    5. 8.5Registers
      1. 8.5.1 CONTROL Register (Address = 00h) [reset = 00h]
      2. 8.5.2 STATUS (FAULT) Register (Address = 01h) [reset = 10h]
      3. 8.5.3 THERM_WARN_LMT Register (Address = 02h) [reset = 80h]
      4. 8.5.4 LED1_PKTH_DAC Register (Address = 03h) [reset = 80h]
      5. 8.5.5 LED2_PKTH_DAC Register (Address = 04h) [reset = 80h]
      6. 8.5.6 LED1_TOFF_DAC Register (Address = 05h) [reset = 80h]
      7. 8.5.7 LED2_TOFF_DAC Register (Address = 06h) [reset = 80h]
      8. 8.5.8 LED1_MAXOFF_DAC Register (Address = 07h) [reset = 80h]
      9. 8.5.9 LED2_MAXOFF_DAC Register (Address = 08h) [reset = 80h]
      10. 8.5.10VTHERM Register (Address = 09h) [reset = 0h]
      11. 8.5.11LED1_MOST_RECENT Register (Address = 0Ah) [reset = 0h]
      12. 8.5.12LED1_LAST_ON Register (Address = 0Bh) [reset = 0h]
      13. 8.5.13LED1_LAST_OFF Register (Address = 0Ch) [reset = 0h]
      14. 8.5.14LED2_MOST_RECENT Register (Address = 0Dh) [reset = 0h]
      15. 8.5.15LED2_LAST_ON Register (Address = 0Eh) [reset = 0h]
      16. 8.5.16LED2_LAST_OFF Register (Address = 0Fh) [reset = 0h]
      17. 8.5.17Reset Register (Address = 10h) [reset = 0h]
    6. 8.6Programming
      1. 8.6.1TPS92518-Q1 Register Typedef - Sample Code
      2. 8.6.2Command Frame - Sample Code
      3. 8.6.3SPI Read/Write - Sample Code
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
      3. 9.2.3Application Curves
    3. 9.3Dos and Don'ts
  10. 10Power Supply Recommendations
    1. 10.1Input Source Direct from Battery
    2. 10.2Input Source from a Boost Stage
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Receiving Notification of Documentation Updates
    2. 12.2Community Resources
    3. 12.3Trademarks
    4. 12.4Electrostatic Discharge Caution
    5. 12.5Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Features

  • AEC-Q100 Qualified for Automotive Applications
    • Grade 1: –40°C to 125°C Ambient Operating Temperature
    • Device HBM Classification Level H2
    • Device CDM Classification Level C5
  • Wide Input Voltage Range 6.5 V to 65 V
  • Two independent Buck LED Controllers
    • High Bandwidth, Quasi-Hysteretic Control
    • Adjustable High-Side Sense
    • Direct PWM Dimming Input
    • Cycle-by-Cycle Current Limit
  • SPI Communications Interface
    • Software configurable Set Points (8-bit)
    • Digital Calibration and Binning
    • Fault Monitoring and Reporting
  • Advanced, High Precision Dimming
    • 10,000:1 PWM Dimming Range
    • 255:1 Analog Dimming Range
    • High Frequency Shunt FET Dimming

Applications

  • Automotive LED Lighting: High and Low Beam, DRL, Turn, Position
  • Constant Current LED Driver
  • Switched Matrix Headlamps
  • AFS Headlamps
  • LED General Lighting

Description

The TPS92518-Q1 family of parts are dual channel buck LED current controllers with a SPI communications interface. The serial communication interface provides a singular communication path for multichannel and platform lighting driver module (LDM) applications.

The TPS92518-Q1 uses a quasi-hysteretic control method that supports switching frequencies ranging from 1 kHz to 2 MHz. This control method enables superior, high frequency shunt FET dimming and also handles the demanding dynamic loads of adaptive LED matrix based headlamp systems.

Software programmable SPI set points (Precision Peak Current, Controlled Off-Time and Output Voltage Sense) enables designers to develop a single LED driver solution for multiple load configurations that can be quickly reconfigured for future LED driver design requirements.

The TPS92518-Q1 device has an input range up to 42 V. The TPS92518HV-Q1 is a high-voltage option with an input range up to 65 V.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
TPS92518-Q1HTSSOP (24)7.7 mm x 4.4 mm
TPS92518HV-Q1
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

TPS92518-Q1 518TypAppFrontPage.gif