TLC5929 Datasheet, PDF (1/36 Pages) Texas Instruments – 16-Channel, Constant-Current LED Driver with 7-Bit Global Brightness Control, Power-Save Mode

TLC5929
www.ti.com
SBVS159 – APRIL 2011
16-Channel, Constant-Current LED Driver with 7-Bit Global Brightness Control,
Power-Save Mode, and Full Self-Diagnosis for LED Lamp
Check for Samples: TLC5929
FEATURES
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•23 16 Constant-Current Sink Output Channels
with On/Off Control
• Current Capability:
– 40 mA (V_CC ≤ 3.6 V)
– 50 mA (V_CC > 3.6 V)
• Global Brightness Control: 7-Bit (128 Steps)
• Power-Supply Voltage Range: 3.0 V to 5.5 V
• LED Power-Supply Voltage: Up to 10 V
• Constant-Current Accuracy:
– Channel-to-Channel = ±1% (typ)
– Device-to-Device = ±2% (typ)
• Data Transfer Rate: 33 MHz
• BLANK Pulse Width: 40 ns (min)
• LED Open Detection (LOD)/LED Short
Detection (LSD) with Invisible Detection Mode
(IDM)
• Output Leakage Detection (OLD) Detects 3 µA
Leak
• Pre-Thermal Warning (PTW)
• Thermal Shutdown (TSD)
• Current Reference Terminal Short Flag (ISF)
• Power-Save Mode with 10-µA Consumption
• Undervoltage Lockout Sets the Default Data
• 2-ns Delayed Switching Between Each
Channel Minimizes Inrush Current
• Operating Temperature: –40°C to +85°C
APPLICATIONS
• Variable Message Signs (VMS)
• Illumination
• LED Video Displays
DESCRIPTION
The TLC5929 is a 16-channel constant current sink
LED driver. Each channel can be turned on or off by
writing data to an internal register. The constant
current value of all 16 channels is set by a single
external resistor with 128 steps for the global
brightness control (BC).
The TLC5929 has six error flags: LED open detection
(LOD), LED short detection (LSD), output leakage
detection (OLD), reference current terminal short
detection (ISF), pre-thermal warning (PTW) and
thermal error flag (TEF). In addition, the LOD and
LSD functions have invisible detection mode (IDM)
that can detect those errors even when the output is
off. The error detection results can be read via a
serial interface port.
The TLC5929 also has a power-save mode that sets
the total current consumption to 10 µA (typ) when all
outputs are off.
Typical Application Circuit (Multiple Daisy-Chained TLC5929s)
VLED
¼
¼
¼
DATA
SCLK
LAT
BLANK
Controller
R_IREF
SID Read
¼
¼
¼ _OUT0
OUT15
SIN
SCLK
TLC5929
LAT
IC1
BLANK
SOUT
VCC
VCC
IREF
GND
R_IREF
3
¼
¼ _OUT0
OUT15
SIN
SCLK
LAT
TLC5929
ICn
BLANK
SOUT
VCC
VCC
IREF
GND
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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.
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All other trademarks are the property of their respective owners.
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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 © 2011, Texas Instruments Incorporated