TLC5955 Datasheet, PDF (1/53 Pages) Texas Instruments – TLC5955 48-Channel, 16-Bit, PWM LED Driver with DC, BC, LED Open-Short Detection, and Internal Current Setting

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TLC5955
SBVS237 – MARCH 2014
TLC5955 48-Channel, 16-Bit, PWM LED Driver with DC, BC, LED Open-Short Detection,
and Internal Current Setting
1 Features
•1 48 Constant-Current Sink Output Channels
• Sink Current Capability with Maximum MC, DC,
and BC Data:
– 23.9 mA (V_CC ≤ 3.6 V, MC = 5)
– 31.9 mA (V_CC > 3.6 V, MC = 7)
• Grayscale (GS) Control:
– 16-Bit (65,536 Steps) with Enhanced Spectrum
or Conventional PWM
• Maximum Current (MC) Control:
– 3 Bits (8 Steps) with a 3-mA to 30-mA Range
– 3 MC Sets for Each Color Group
• Dot Correction (DC) Control:
– 7 Bits (128 Steps) with a 26.2% to 100%
Range
• Global Brightness Control (BC):
– 7 Bits (128 Steps) with a 10% to 100% Range
– 3 BC Sets for Each Color Group
• LED Power-Supply Voltage: Up to 10 V
• VCC: 3.0 V to 5.5 V
• Constant-Current Accuracy:
– Channel-to-Channel: ±2% (typ), ±5% (max)
– Device-to-Device: ±2% (typ), ±4% (max)
• Data Transfer Rate: 25 MHz
• Grayscale Control Clock: 33 MHz
• Auto Display Repeat
• Display Timing Reset
• Auto Data Refresh (GS and DC Only)
• LED Open Detection (LOD)
• LED Short Detection (LSD)
• UVLO Sets Default Data
• Delay Switching to Prevent Inrush Current
• Operating Temperature: –40°C to +85°C
2 Applications
• LED Video Displays
• Variable Message Signs (VMS)
• Illumination
3 Description
The TLC5955 is a 48-channel, constant-current sink
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 between the R, G, B
color group. The eight-step maximum current control
(MC) selects the maximum output current range for
all channels of each color group. GS, DC, BC, and
MC data are accessible with a serial interface port.
The TLC5955 has two error flags: LED open
detection (LOD) and LED short detection (LSD). The
error detection results can be read with a serial
interface port.
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
TLC5955DCA
HTSSOP (56)
14,0 mm × 6,1 mm
TLC5955RTQ
QFN (56)
8,0 mm × 8,0 mm
V_LED
+
GND
Input Serial Data
Shift Clock
Data Latch
GS Clock
Application Circuit
x48
OUTR0
SIN
SCLK
LAT
GSCLK
OUTB15
SOUT
TLC5955
VCC
GND
GND
Output Serial Data
V_CC
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.