TLC5951 Datasheet, PDF (1/46 Pages) Texas Instruments – 24-Channel, 12-Bit PWM LED Driver with 7-Bit Dot Correction and 3-Group, 8-Bit Global Brightness Control

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
FEATURES
1
•23 24-Channel Constant-Current Sink Output
• Current Capability: 40 mA
• Selectable Grayscale (GS) Control with PWM:
12-Bit (4096 Step), 10-Bit (1024 Step), 8-Bit
(256 Step)
• Three Independent Grayscale Clocks for Three
Color Groups
• Dot Correction (DC): 7-Bit (128 Step)
• Global Brightness Control (BC) for Each Color
Group: 8-Bit (256 Step)
• Auto Display Repeat Function
• Independent Data Port for GS and BC/DC Data
• Communication Path Between Each Data Port
• LED Power-Supply Voltage up to 15 V
• V_CC = 3.0 V to 5.5 V
• Constant-Current Accuracy:
– Channel-to-Channel = ±1.5%
– Device-to-Device = ±3%
• CMOS Logic Level I/O
• Data Transfer Rate: 30 MHz
¼
• 33-MHz Grayscale Control Clock
• Continuous Base LED Open Detection (LOD)
• Continuous Base LED Short Detection (LSD)
• Thermal Shutdown (TSD) with Auto Restart
• Grouped Delay to Prevent Inrush Current
• Operating Air Temperature: –40°C to +85°C
• Packages: HTSSOP-38, QFN-40
APPLICATIONS
• Full-Color LED Displays
• LED Signboards
DESCRIPTION
The TLC5951 is a 24-channel, constant-current sink
driver. Each channel has an individually-adjustable,
4096-step, pulse width modulation (PWM) grayscale
(GS) brightness control and 128 step constant-current
dot correction (DC). The dot correction adjusts
brightness deviation between channels and other
LED drivers. The output channels are grouped into
three groups of eight channels. Each channel group
has a 256-step global brightness control (BC) function
and an individual grayscale clock input.
VLED
¼
¼
Controller
GSSIN
GSSCK
GSLAT
DCSIN
DCSCK
XBLNK
GSCKR
GSCKG
GCCKB
FLAGS
READ
R_IREF
¼
¼
¼ _OUTR0/G0/B0
OUTR7/G7/B7
GSSIN
GSSOUT
GSSCK
GSLAT
DCSIN
DCSOUT
DCSCK
XBLNK
VCC
GSCKR
GSCKG
GSCKB
TLC5951
IC1
VCC
GND
IREF
7
R_IREF
¼
¼ _OUTR0/G0/B0
OUTR7/G7/B7
GSSIN
GSSOUT
GSSCK
GSLAT
DCSIN
DCSOUT
DCSCK
XBLNK
VCC
GSCKR
GSCKG
GSCKB
TLC5951
ICn
VCC
GND
IREF
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.
PowerPAD is a trademark of Texas Instruments, Incorporated.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated