TLC5973D Datasheet, PDF (1/27 Pages) Texas Instruments – 3-Channel, 12-Bit, PWM Constant-Current LED Driver

TLC5973
www.ti.com
SBVS225A – MARCH 2013 – REVISED MAY 2013
3-Channel, 12-Bit, PWM Constant-Current LED Driver
with Single-Wire Interface ( EasySet™)
Check for Samples: TLC5973
FEATURES
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•23 Three Constant Sink Current Channels
• Current Capability:
– 2 mA to 35 mA per Channel (VCC ≤ 4.0 V)
– 2 mA to 50 mA per Channel (VCC > 4.0 V)
• Grayscale (GS) Control with PWM:
– 12-Bit (4096 Steps)
• Single-Wire Interface (EasySet)
• Power-Supply (VCC) Voltage Range:
– 3 V to 6 V
• OUT Terminals Maximum Voltage: Up to 21 V
• Integrated Shunt Regulator
• Data Transfer Maximum Rate:
– Bits per Second (bps): 3 Mbps
• Internal GS Clock Oscillator: 12 MHz (typ)
• Display Repeat Rate: 2.9 kHz (typ)
• Output Delay Switching to Prevent Inrush
Current
• Unlimited Device Cascading
• Operating Temperature: –40°C to +85°C
APPLICATIONS
• RGB LED Cluster Lamp Display
DESCRIPTION
The TLC5973 is an easy-to-use, 3-channel, 50-mA
constant sink current LED driver. The single-wire, 3-
Mbps serial interface (EasySet) provides a solution
for minimizing wiring cost. The LED driver provides 8-
bit pulse width modulation (PWM) resolution. The
display repeat rate is achieved at 2.9 kHz (typ) with
an integrated 12-MHz grayscale (GS) clock oscillator.
The driver also provides unlimited cascading
capability.
All output sink constant currents can be set by an
external resistor. The TLC5973 has an internal shunt
regulator that can be used for higher VCC power-
supply voltage applications.
Power
Supply
(5 V)
VCC
GND
Controller
R_IREF
GND
IREF
Device
SDI
VCC
OUT0
OUT1
OUT2
SDO
R_IREF
GND
IREF
Device
SDI
VCC
OUT0
OUT1
OUT2
SDO
Figure 1. Typical Application Circuit Example 1 (No Internal Shunt Regulator Mode)
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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.
EasySet is a trademark of Texas Instruments, Inc.
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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 © 2013, Texas Instruments Incorporated