SLVS867B May   2009  – August 2015 TLC59213 , TLC59213A

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 Electrical Characteristics
    5. 6.5 Timing Requirements
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
  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 Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Community Resources
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

In LED display application, TLC59213 is used to drive the current source for 8 LEDs in parallel. LED display pattern can be created by providing different bit pattern. At every positive clock edge, new bit pattern will be transferred to LED display.

9.2 Typical Application

TLC59213 TLC59213A SLVS867_typ_app.gifFigure 4. Typical Application Diagram

9.2.1 Design Requirements

For LED display application, LED is selected based on the application. The current level is determined by the required brightness. Given the available supply, the resistor value could be determined. The maximum output current is constrained by the duty cycle. See Figure 1 and Figure 2.

9.2.2 Detailed Design Procedure

The selection of supply voltage (VCC), LED, and resistor sets the current of the LED.

Equation 1. VR + VL + VCE = VCC
Equation 2. I = (VCC - VL - VCE) /R

VR is the voltage drop across the resistor, VL is the voltage drop across the LED when LED is on, VCE is the collector-to-emitter voltage of the Darlington current source driver, when the driver is enabled. For example, when VCC = 12 V, VL = 2.9 V, and VCE = 1.6 V, a 75-Ω resistor is used to obtain output current 100 mA.

9.2.3 Application Curve

TLC59213 TLC59213A app_curve_1.png
Figure 5. Output Voltage and Current Response