Sample & Support & Product Tools & Technical Community Buy Folder Documents Software TLC5947 SBVS114BJULY 2008REVISED JANUARY 2015 TLC5947 24-Channel, 12-Bit PWM LED Driver With Internal Oscillator 1 Features 2 Applications 1 24 Channels, Constant-Current Sink Output Static LED Displays 30-mA Capability (Constant-Current Sink) Message Boards 12-Bit (4096 Steps) PWM Grayscale Control Amusement Illumination LED Power-Supply Voltage Up to 30 V TV Backlighting V = 3.0 V to 5.5 V CC 3 Description Constant-Current Accuracy: The TLC5947 is a 24-channel, constant-current sink Channel-to-Channel = 2% (Typical) LED driver. Each channel is individually adjustable Device-to-Device = 2% (Typical) with 4096 pulse-width modulated (PWM) steps. PWM control is repeated automatically with the CMOS Logic Level I/O programmed grayscale (GS) data. GS data are 30-MHz Data Transfer Rate (Standalone) written via a serial interface port. The current value of 15-MHz Data Transfer Rate (Cascaded Devices, all 24 channels is set by a single external resistor. SCLK Duty = 50%) The TLC5947 has a thermal shutdown (TSD) function Shift Out Data Changes With Falling Edge to that turns off all output drivers during an over- Avoid Data Shift Errors temperature condition. All of the output drivers Auto Display Repeat automatically restart when the temperature returns to normal conditions. 4-MHz Internal Oscillator Thermal Shutdown (TSD): (1) Device Information Automatic Shutdown at OverTemperature PART NUMBER PACKAGE BODY SIZE (NOM) Conditions HTSSOP (32) 11.00 mm 6.20 mm TLC5947 Restart Under Normal Temperature VQFN (32) 5.00 mm 5.00 mm Noise Reduction: (1) For all available packages, see the orderable addendum at 4-Channel Grouped Delay to Prevent Inrush the end of the datasheet. Current Operating Temperature: 40C to 85C Application Circuit V V V V LED LED LED LED OUT0 OUT23 OUT0 OUT23 DATA SIN SOUT SIN SOUT SCLK SCLK SCLK V V Controller CC CC XLAT XLAT TLC5947 XLAT TLC5947 BLANK IC1 ICn VCC VCC BLANK BLANK GND GND IREF IREF R R IREF IREF 3 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.TLC5947 SBVS114BJULY 2008REVISED JANUARY 2015 www.ti.com Table of Contents 1 Features.................................................................. 1 8 Detailed Description............................................ 12 8.1 Overview................................................................. 12 2 Applications........................................................... 1 8.2 Functional Block Diagram....................................... 12 3 Description............................................................. 1 8.3 Feature Description................................................. 12 4 Revision History..................................................... 2 8.4 Programming........................................................... 15 5 Pin Configuration and Functions......................... 3 9 Application and Implementation........................ 18 6 Specifications......................................................... 4 9.1 Application Information............................................ 18 6.1 Absolute Maximum Ratings ..................................... 4 9.2 Typical Application ................................................. 18 6.2 ESD Ratings.............................................................. 4 10 Power Supply Recommendations..................... 20 6.3 Recommended Operating Conditions....................... 5 11 Layout................................................................... 20 6.4 Thermal Information.................................................. 5 11.1 Layout Guidelines................................................. 20 6.5 Dissipation Ratings................................................... 5 11.2 Layout Example.................................................... 20 6.6 Electrical Characteristics........................................... 6 11.3 Power Dissipation................................................. 21 6.7 Switching Characteristics.......................................... 7 12 Device and Documentation Support................. 22 6.8 Typical Characteristics.............................................. 9 12.1 Trademarks........................................................... 22 7 Parameter Measurement Information................ 11 12.2 Electrostatic Discharge Caution............................ 22 7.1 Pin Equivalent Input and Output Schematic Diagrams.................................................................. 11 12.3 Glossary................................................................ 22 7.2 Test Circuits............................................................ 11 13 Mechanical, Packaging, and Orderable Information........................................................... 22 4 Revision History Changes from Revision A (September 2008) to Revision B Page Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1 2 Submit Documentation Feedback Copyright 20082015, Texas Instruments Incorporated Product Folder Links: TLC5947