¼

¼

VCC

¼

¼

VLED

¼

GSSIN

GSSCK

GSLAT

DCSIN

DCSCK

¼

R

IREF

Controller

7

FLAGS

READ

XBLNK

GSCKR

GSCKG

GCCKB

¼

GSSIN

GSSCK

GSLAT

GSSOUT

DCSOUT

VCC

GND

TLC5951

IC1

OUTR0/G0/B0

OUTR7/G7/B7

DCSIN

DCSCK

XBLNK

GSCKR

GSCKG

GSCKB

IREF

¼

GSSIN

GSSCK

GSLAT

GSSOUT

DCSOUT

VCC

GND

TLC5951

ICn

OUTR0/G0/B0

OUTR7/G7/B7

DCSIN

DCSCK

XBLNK

GSCKR

GSCKG

GSCKB

IREF

VCC

R

IREF

TLC5951

www.ti.com

SBVS127B – MARCH 2009 – REVISED DECEMBER 2009

24-Channel, 12-Bit PWM LED Driver with 7-Bit Dot Correction

and 3-Group, 8-Bit Global Brightness Control

Check for Samples: TLC5951

1

FEATURES

•

33-MHz Grayscale Control Clock

23

•

24-Channel Constant-Current Sink Output

•

Continuous Base LED Open Detection (LOD)

•

Current Capability: 40 mA

•

Continuous Base LED Short Detection (LSD)

•

Selectable Grayscale (GS) Control with PWM:

•

Thermal Shutdown (TSD) with Auto Restart

12-Bit (4096 Step), 10-Bit (1024 Step), 8-Bit

•

Grouped Delay to Prevent Inrush Current

(256 Step)

•

Operating Air Temperature: –40°C to +85°C

•

Three Independent Grayscale Clocks for Three

•

Packages: HTSSOP-38, QFN-40

Color Groups

•

Dot Correction (DC): 7-Bit (128 Step)

APPLICATIONS

•

Global Brightness Control (BC) for Each Color

•

Full-Color LED Displays

Group: 8-Bit (256 Step)

•

LED Signboards

•

Auto Display Repeat Function

DESCRIPTION

•

Independent Data Port for GS and BC/DC Data

•

Communication Path Between Each Data Port

The TLC5951 is a 24-channel, constant-current sink

driver. Each channel has an individually-adjustable,

•

LED Power-Supply Voltage up to 15 V

4096-step, pulse width modulation (PWM) grayscale

•

(GS) brightness control and 128 step constant-current

•

Constant-Current Accuracy:

dot correction (DC). The dot correction adjusts

brightness deviation between channels and other

–

Channel-to-Channel = ±1.5%

LED drivers. The output channels are grouped into

–

Device-to-Device = ±3%

three groups of eight channels. Each channel group

•

CMOS Logic Level I/O

has a 256-step global brightness control (BC) function

and an individual grayscale clock input.

•

Data Transfer Rate: 30 MHz

Typical Application Circuit (Multiple Daisy-Chained TLC5951s)

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPAD is a trademark of Texas Instruments, Incorporated.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.