TIDUED7A November   2018  – November 2022

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Products
      1. 2.2.1 LM5155-Q1
      2. 2.2.2 TPS92610-Q1, TPS92611-Q1
    3. 2.3 System Design Theory
      1. 2.3.1  PCB and Form Factor
      2. 2.3.2  Input Protection
      3. 2.3.3  EMI Filter
      4. 2.3.4  LM5155-Q1 Voltage Regulator
      5. 2.3.5  Tail Light (2x TPS92611-Q1)
      6. 2.3.6  Stop Light (2x TPS92610-Q1)
      7. 2.3.7  Turn Light (TPS92610-Q1)
      8. 2.3.8  Backup Light
      9. 2.3.9  Enabling Light Functions
      10. 2.3.10 Diagnostic
      11. 2.3.11 LED Load
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware
    2. 3.2 Testing and Results
      1. 3.2.1 Startup / Shutdown
      2. 3.2.2 Steady State Operation
      3. 3.2.3 Load Transient Response
      4. 3.2.4 Stability
      5. 3.2.5 Efficiency
      6. 3.2.6 Electromagnetic Compatibility (EMC)
        1. 3.2.6.1 Conducted Emissions
        2. 3.2.6.2 Radiated Emissions
      7. 3.2.7 Thermal Performance
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Related Documentation
  11. 6Trademarks
  12. 7About the Author
  13. 8Revision History

2.3.5 Tail Light (2x TPS92611-Q1)

For the tail light, two led strings are used where each gets driven by a TPS92611-Q1 linear LED driver. Table 2-2 shows the default design parameters for the tail light.

Table 2-2 Default Design Parameters of Tail Light
DESIGN PARAMETER VALUE
Input voltage 12.5 V
LED string current 50 mA
Number of LEDs in series 5

Figure 2-8 shows the default schematic of one TPS92611-Q1 linear led driver for tail light of this reference design.

GUID-FDE19EEE-B28C-4090-9ABC-DF9BC161E019-low.gifFigure 2-8 Schematic of TPS92611-Q1 Tail Light LED Driver

The main components in the schematic are selected by following the Detailed Design Procedure section in the TPS92611-Q1 Automotive Single-Channel Linear LED Driver data sheet.

With the resistor R30, the LED current is set to 50 mA. Capacitors C26 and C30 are added for noise filtering. Resistor R32 and R34 set the input voltage level where open circuit detection will be active.