SLVSA51E March   2010  – September 2016 TLC5940-EP

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Test Parameter Equations
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Serial Interface
      2. 8.3.2 Error Information Output
      3. 8.3.3 TEF: Thermal Error Flag
      4. 8.3.4 LOD: LED Open Detection
      5. 8.3.5 Delay Between Outputs
      6. 8.3.6 Output Enable
      7. 8.3.7 Setting Maximum Channel Current
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operating Modes
      2. 8.4.2 Setting Dot Correction
      3. 8.4.3 Setting Grayscale
      4. 8.4.4 Status Information Output
      5. 8.4.5 Grayscale PWM Operation
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedures
        1. 9.2.2.1 Serial Data Transfer Rate
        2. 9.2.2.2 Grayscale (GS) Data
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Power Dissipation Calculation
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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10 Power Supply Recommendations

The VCC power supply voltage should be decoupled by placing a 0.1-µF ceramic capacitor close to VCC pin and GND plane. Depending on panel size, several electrolytic capacitors must be placed on board equally distributed to get a well-regulated LED supply voltage (VLED). VLED voltage ripple should be less than 5% of its nominal value. Furthermore, the VLED should be set to the voltage calculated by Equation 10:

Equation 10. VLED > VF + 0.4 V ( 10-mA constant current example)

where

  • Vf = maximum forward voltage of all LEDs