TLC5947_17 Datasheet, PDF (1/33 Pages) Texas Instruments – 24-Channel, 12-Bit PWM LED Driver With Internal Oscillator

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TLC5947
SBVS114B – JULY 2008 – REVISED JANUARY 2015
TLC5947 24-Channel, 12-Bit PWM LED Driver With Internal Oscillator
1 Features
•1 24 Channels, Constant-Current Sink Output
• 30-mA Capability (Constant-Current Sink)
• 12-Bit (4096 Steps) PWM Grayscale Control
• LED Power-Supply Voltage Up to 30 V
• V_CC = 3.0 V to 5.5 V
• Constant-Current Accuracy:
– Channel-to-Channel = ±2% (Typical)
– Device-to-Device = ±2% (Typical)
• CMOS Logic Level I/O
• 30-MHz Data Transfer Rate (Standalone)
• 15-MHz Data Transfer Rate (Cascaded Devices,
SCLK Duty = 50%)
• Shift Out Data Changes With Falling Edge to
Avoid Data Shift Errors
• Auto Display Repeat
• 4-MHz Internal Oscillator
• Thermal Shutdown (TSD):
– Automatic Shutdown at OverTemperature
Conditions
– Restart Under Normal Temperature
• Noise Reduction:
– 4-Channel Grouped Delay to Prevent Inrush
Current
• Operating Temperature: –40°C to 85°C
2 Applications
• Static LED Displays
• Message Boards
• Amusement Illumination
• TV Backlighting
3 Description
The TLC5947 is a 24-channel, constant-current sink
LED driver. Each channel is individually adjustable
with 4096 pulse-width modulated (PWM) steps. PWM
control is repeated automatically with the
programmed grayscale (GS) data. GS data are
written via a serial interface port. The current value of
all 24 channels is set by a single external resistor.
The TLC5947 has a thermal shutdown (TSD) function
that turns off all output drivers during an over-
temperature condition. All of the output drivers
automatically restart when the temperature returns to
normal conditions.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
TLC5947
HTSSOP (32)
VQFN (32)
11.00 mm × 6.20 mm
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Application Circuit
V_LED
V_LED
V_LED
V_LED
¼
¼
¼
Controller
DATA
SCLK
XLAT
BLANK
¼
¼
¼
¼
¼ _OUT0
OUT23
SIN
SOUT
SCLK
V_CC
XLAT TLC5947
IC1
BLANK
VCC
¼
¼
¼ _OUT0
OUT23
SIN
SOUT
SCLK
V_CC
XLAT TLC5947
BLANK ^ICn
VCC
R_IREF
IREF
GND
R_IREF
IREF
GND
3
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.