TLC5928 Datasheet, PDF (1/27 Pages) Texas Instruments – 16-Channel, Constant-Current LED Driver with LED Open Detection

TLC5928
www.ti.com ................................................................................................................................................. SBVS120A – JULY 2008 – REVISED SEPTEMBER 2008
16-Channel, Constant-Current LED Driver with LED Open Detection
FEATURES
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•23 16 Channels, Constant Current Sink Output
with On/Off Control
• 35-mA Capability (Constant Current Sink)
• 10-ns High-Speed Constant Current Switching
Transient Time
• Low On-Time Error
• LED Power-Supply Voltage up to 17 V
• V_CC = 3.0 V to 5.5 V
• Constant Current Accuracy:
– Channel-to-Channel = ±1%
– Device-to-Device = ±1%
• CMOS Logic Level I/O
• 35-MHz Data Transfer Rate
• 20-ns BLANK Pulse Width
• Readable Error Information:
– LED Open Detection (LOD)
– Pre-Thermal Warning (PTW)
• Operating Temperature: –40°C to +85°C
APPLICATIONS
• LED Video Displays
• Message Boards
• Illumination
DESCRIPTION
The TLC5928 is a 16-channel, constant current sink
LED driver. Each channel can be turned on/off by
writing serial data to an internal register. The constant
current value of all 16 channels is set by a single
external resistor.
The TLC5928 has two error detection circuits: one for
LED open detection (LOD) and one for a pre-thermal
warning (PTW). LOD detects a broken or
disconnected LED and LEDs shorted to GND while
the constant current output is on. PTW indicates a
high temperature condition.
VLED
VLED
¼
¼
VLED
VLED
¼
Controller
DATA
SCLK
LAT
BLANK
ERROR
READ
R_IREF
¼
¼
¼ _OUT0
OUT15
SIN
SCLK
SOUT
VCC
LAT
BLANK
TLC5928
IREF
IC1
VCC
GND
R_IREF
¼
¼ _OUT0
OUT15
SIN
SCLK
SOUT
VCC
LAT
BLANK
TLC5928
IREF
ICn
VCC
GND
3
Typical Application Circuit (Multiple Daisy-Chained TLC5928s)
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments, Inc.
2
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3
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated