TLC5957 Datasheet, PDF (1/25 Pages) Texas Instruments – TLC5957 48-Channel, 16-Bit ES-PWM LED Driver with Pre-Charge FET, LED OPEN Detection and Caterpillar Cancelling

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TLC5957
SLVSCQ4 – OCTOBER 2014
TLC5957 48-Channel, 16-Bit ES-PWM LED Driver with Pre-Charge FET,
LED OPEN Detection and Caterpillar Cancelling
1 Features
•1 48 Constant-Current Sink Output Channels
• Sink Current Capability with Max BC/CC data
– 1~20mA (VCC = 3.3V)
– 1~25mA (VCC = 5V)
• Global Brightness Control (BC): 3-Bit (8 Step)
• Global Brightness Control (CC) for Each Color
Group: 9-Bit (512 Step), Three Groups
• LED Power Supply Voltage up to 10V
• VCC = 3.0 to 5.5V
• Knee Voltage Vout = 0.24V at 10mA
• Constant Current Accuracy
– Channel to Channel = ±1%(Typ), ±3%(Max)
– Device to Device = ±1%(Typ), ±2%(Max)
• Data Transfer Rate : 33MHz
• Grayscale Control Clock : 33MHz
• Pre-charge FET for Ghost Cancelling
• Enhanced Circuit for Caterpillar Cancelling
• Selectable Data Transfer Bit and PWM Bit (9 bit to
16 bit)
• Selectable Traditional PWM and ES-PWM
• LED Open Detection (LOD)
• Thermal Shut Down (TSD)
• Auto Display Repeat/Auto Data Refresh
• Delay Switching to Prevent Inrush Current
• Operating Temperature : –40°C to +85°C
2 Applications
• LED Video Displays
• LED Signboards
3 Description
The TLC5957 is a 48-channel constant current sink
driver. Each channel has an individually-adjustable,
65536-step, pulse width modulation (PWM) grayscale
(GS) brightness control.
The output channels are divided into three groups,
each group has a 512 step color brightness control
(CC), CC adjusts brightness between colors. The
maximum current value of all 48 channels can be set
by 8-step global brightness control (BC). BC adjusts
brightness deviation between LED drivers. GS, CC
and BC data are accessible via a serial interface port.
TLC5957 has one error flag: LED open detection
(LOD), which can be read via a serial interface port.
Each constant-current has a pre-charge field- effect
transistor (FET), which can remove ghosting and
improve display performance on the multiplexing LED
display. Besides, TLC5957 has an enhanced circuit, it
can cancel the caterpillar effect caused by LED open.
TLC5957 has a poker data transmission mode; GS
data length can be configured from 9 bit to 16 bit
according to PWM bits in each sub-segment. Poker
Mode can significantly increase visual refresh rate in
multiplexing applications.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TLC5957
QFN (56)
8.0 mm × 8.0 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Typical Application Circuit (Multiple Daisy Chained TLC5957s)
VLED
SW
COM n
COM n
VLED
SW
COM 1
VLED
SW
COM 0
X 48
COM 1
COM 0
X 48
Controller
DATA
SCLK
LAT
GCLK
FLAGS
READ
OUTR0
OUTB15
SIN
SCLK
LAT
TLC5957
IC1
GCLK
IREF
IREFGND
SOUT
VCC
Thermal
Pad
VCC
GND
GND
3
OUTR0
OUTB15
SIN
SCLK
TLC5957
LAT
ICn
GCLK
IREF
IREFGND
SOUT
VCC
Thermal
Pad
VCC
GND
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.