1

FEATURES

APPLICATIONS

DESCRIPTION

¼

SIN

SCLK

XLAT

BLANK

SOUT

VCC

GND

TLC5947

IC1

OUT0

OUT23

¼

¼

DATA

SCLK

XLAT

BLANK

¼

R

IREF

IREF

Controller

3

V

CC

¼

¼

V

LED

V

LED

¼

V

LED

V

LED

¼

¼

¼

¼

SIN

SCLK

XLAT

BLANK

SOUT

VCC

GND

TLC5947

ICn

OUT0

OUT23

R

IREF

IREF

V

CC

TLC5947

24-Channel, 12-Bit PWM LED Driver with

Internal Oscillator

• Noise Reduction:

23

• 24 Channels, Constant Current Sink Output

–

4-channel grouped delay to prevent inrush

current

• 30-mA Capability (Constant Current Sink)

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

• 12-Bit (4096 Steps) PWM Grayscale Control

• LED Power-Supply Voltage up to 30 V

• V

• Static LED Displays

• Constant Current Accuracy:

• Message Boards

–

Channel-to-Channel = ±2% (typ)

• Amusement Illumination

–

Device-to-Device = ±2% (typ)

• TV Backlighting

• CMOS Logic Level I/O

• 30-MHz Data Transfer Rate (Standalone)

• 15-MHz Data Transfer Rate (Cascaded Devices,

The TLC5947 is a 24-channel, constant current sink

SCLK Duty = 50%)

LED driver. Each channel is individually adjustable

with 4096 pulse-width modulated (PWM) steps. PWM

• Shift Out Data Changes With Falling Edge to

control

is

repeated

automatically

with

the

Avoid Data Shift Errors

programmed grayscale (GS) data. GS data are

• Auto Display Repeat

written via a serial interface port. The current value of

all 24 channels is set by a single external resistor.

• 4-MHz Internal Oscillator

• Thermal Shutdown (TSD):

The TLC5947 has a thermal shutdown (TSD) function

that

turns

off

all

output

drivers

during

an

–

Automatic shutdown at over temperature

over-temperature condition. All of the output drivers

conditions

automatically restart when the temperature returns to

–

Restart under normal temperature

normal conditions.

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, Inc.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, 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.