TLC5948A Datasheet, PDF (1/50 Pages) Texas Instruments – 16-Channel, 16-Bit, ES-PWM, Full Self-Diagnosis LED Driver

TLC5948A
www.ti.com
SBVS192 – MARCH 2012
16-Channel, 16-Bit, ES-PWM, Full Self-Diagnosis LED Driver for
7-Bit DC and 7-Bit Global BC LED Lamp
Check for Samples: TLC5948A
FEATURES
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•23 16 Constant-Current Sink Output Channels
• Sink Current Capability with Maximum DC and
BC Data:
– 2 mA to 45 mA (V_CC ≤ 3.6 V)
– 2 mA to 60 mA (V_CC > 3.6 V)
• Dot Correction (DC):
– 7-Bit (128 Steps) with 0% to 100% Range
• Global Brightness Control (BC):
– 7-Bit (128 Steps) with 25% to 100% Range
• Grayscale Control (GS) with Enhanced
Spectrum or Conventional PWM:
– 16-Bit (65,536 Steps)
• LED Power-Supply Voltage: Up to 10 V
• VCC: 3.0 V to 5.5 V
• Constant-Current Accuracy:
– Channel-to-Channel: ±0.6% (typ), ±2% (max)
– Device-to-Device: ±1% (typ), ±4% (max)
• Data Transfer Rate: 33 MHz
• Grayscale Control Clock: 33 MHz
• Auto Display Repeat and Auto Data Refresh
• Display Timing Reset
• Power-Save Mode to Minimize VCC Current
• LOD and LSD with Invisible Detection
Mode (IDM)
• Output Leakage Detection (OLD)
• Current Reference Terminal Short Flag (ISF)
• Thermal Shutdown (TSD) and Error Flag (TEF)
• Pre-Thermal Warning (PTW)
• Four-Channel Grouped Delay Switching to
Prevent Inrush Current
• Operating Temperature: –40°C to +85°C
APPLICATIONS
• LED Video Displays
• LED Signboards
DESCRIPTION
The TLC5948A is a 16-channel, constant-current sink
LED driver. Each channel has an individually-
adjustable, pulse width modulation (PWM) grayscale
(GS) brightness control with 65,536 steps and 128
steps of constant-current dot correction (DC). DC
adjusts brightness deviation between channels. All
channels have a 128-step global brightness control
(BC). BC adjusts brightness deviation with other LED
drivers. GS, DC, and BC data are accessible with a
serial interface port.
The TLC5948A has six error flags: LED open
detection (LOD), LED short detection (LSD), output
leakage detection (OLD), reference current terminal
short flag detection (ISF), pre-thermal warning (PTW),
and thermal error flag (TEF). The error detection
results can be read with a serial interface port.
VLED
¼
¼
¼
DATA
SCLK
LAT
GSCLK
Controller
R_IREF
Data Read
¼
¼
¼ _OUT0
OUT15
SIN
SCLK
SOUT
VCC
LAT ^{Device 1}
GSCLK
VCC
IREF
GND
R_IREF
3
¼
¼ _OUT0
OUT15
SIN
SCLK
LAT Device n
GSCLK
SOUT
VCC
VCC
IREF
GND
Typical Application Circuit (Multiple Daisy-Chained TLC5948As)
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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.
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 © 2012, Texas Instruments Incorporated