SLVS765B October   2008  – September 2015 TLC5925

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: VDD = 3 V
    6. 6.6  Electrical Characteristics: VDD = 5.5 V
    7. 6.7  Power Dissipation and Thermal Impedance
    8. 6.8  Timing Requirements
    9. 6.9  Switching Characteristics: VDD = 3 V
    10. 6.10 Switching Characteristics: VDD = 5.5 V
    11. 6.11 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
      1. 8.3.1 Constant Current
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Turning on the LEDs
      2. 9.1.2 Propagation Delay Times
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Adjusting Output Current
      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

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8 Detailed Description

8.1 Overview

The TLC5925 is a 16-channel LED driver designed for LED displays and LED lighting applications. The TLC5925 contains a 16-bit shift register and data latches, which convert serial input data into parallel output format. At the TLC5925 output stage, 16 regulated-current ports provide uniform and constant current for driving LEDs within a wide range of VF variations. Used in system design for LED display applications (for example, LED panels), the TLC5925 provides great flexibility and device performance. Users can adjust the output current from 3 mA to 45 mA through an external resistor, REXT, which gives flexibility in controlling the light intensity of LEDs. TLC59025 is designed for up to 17 V at the output port. The high clock frequency, 30 MHz, also satisfies the system requirements of high-volume data transmission.

8.2 Functional Block Diagram

TLC5925 bd_lvs765.gif

8.3 Feature Description

8.3.1 Constant Current

In LED display applications, TLC5925 provides nearly no current variations from channel to channel and from IC to IC. While IOUT ≤ 45 mA, the maximum current skew between channels is less than ±5% and between ICs is less than ±6%.

8.4 Device Functional Modes

The table below lists the functional modes for the TLC5925.

Table 1. Truth Table in Normal Operation

CLK LE OE SDI OUT0...OUT15...OUT15 SDO
↑ H L Dn Dn...Dn – 7...Dn – 15 Dn – 15
↑ L L Dn + 1 No change Dn – 14
↑ H L Dn + 2 Dn + 2...Dn – 5...Dn – 13 Dn – 13
↓ X L Dn + 3 Dn + 2...Dn – 5...Dn – 13 Dn – 13
↓ X H Dn + 3 off Dn – 13