TLC5923 Datasheet, PDF (1/15 Pages) Texas Instruments – LED DRIVER

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LED DRIVER
TLC5923
SLVS550 – DECEMBER 2004
FEATURES
• 16 Channels
• Drive Capability
– 0 to 80 mA (Constant-Current Sink)
• Constant Current Accuracy
– ±1% (typical)
• Serial Data Interface
• Fast Switching Output: T_r / T_f = 10ns (typical)
• CMOS Level Input/Output
• 30 MHz Data Transfer Rate
• V_CC = 3.0 V to 5.5 V
• Operating Temperature = -20°C to 85 °C
• LED Supply Voltage up to 17 V
• 32-pin HTSSOP (PowerPAD™) Package
• Dot Correction
– 7 bit (128 Steps)
– individual adjustable for each channel
• Controlled In-Rush Current
• Error Information
– LOD: LED Open Detection
– TEF: Thermal Error Flag
APPLICATIONS
• Monocolor, Multicolor, Fullcolor LED Display
• Monocolor, Multicolor LED Signboard
• Display Backlighting
• Multicolor LED lighting applications
DESCRIPTION
The TLC5923 is a 16 channel constant-current sink
driver. Each channel has a On/Off state and a
128-step adjustable constant current sink (dot correc-
tion). The dot correction adjusts the brightness vari-
ations between LED, LED channels and other LED
drivers. Both dot correction and On/Off state are
accessible via a serial data interface. A single exter-
nal resistor sets the maximum current of all 16
channels.
The TLC5923 features two error information circuits.
The LED open detection (LOD) indicates a broken or
disconnected LED at an output terminal. The thermal
error flag (TEF) indicates an overtemperature con-
dition.
VCC GND PGND SCLK
SIN
MODE XLAT
BLANK
IREF
Max. OUTn
Current
MODE
01
0
On/Off
Input
Shift
Register
15
16
16
0 ¹¹²
LED Open
Detection
(LOD)
Temperature
Error Flag
(TEF)
BLANK
10
XERR
DC Input
Shift
Register
111
01
MODE
10
LOD ⁰
0
On/Off Register
0
7−bit DC Register
6
LOD
1
1
On/Off Register
7
7−bit DC Register
13
Constant Current
Driver
Delay
x0
OUT0
BLANK
Constant Current
Driver
Delay
x1
OUT1
LOD ¹⁵
15
On/Off Register
105
7−bit DC Register
111
BLANK
Constant Current
Driver
Delay
x15
OUT15
SOUT
Figure 1. Function Block Diagram
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.
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 © 2004, Texas Instruments Incorporated