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TLC6946 Datasheet(PDF) 19 Page - Texas Instruments

Part No. TLC6946
Description  16-Channel 32-, 48-Multiplexing 16-Bit ES-PWM Constant-Current LED Driver
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLC6946 Datasheet(HTML) 19 Page - Texas Instruments

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Controller
RIREF
VCC
VCC
3
VCC
VLED
VLED
VLED
DATA
SCLK
LAT
GSCLK
DATA BACK
RIREF
RIREF
Line 0
Line n
Line 47
OUT0
OUT15
SIN
SCLK
LAT
GCLK
IREF
GND
VCC
SOUT
TLC6948
IC1
OUT0
OUT15
SIN
SCLK
LAT
GCLK
IREF
GND
VCC
SOUT
TLC6948
IC2
OUT0
OUT15
SIN
SCLK
LAT
GCLK
IREF
GND
VCC
SOUT
TLC6948
IC3
19
TLC6946, TLC6948
www.ti.com
SLVSEB3A – JUNE 2018 – REVISED JANUARY 2019
Product Folder Links: TLC6946 TLC6948
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Copyright © 2018–2019, Texas Instruments Incorporated
10 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
The TLC6948 device is a 16-channel constant-current sink LED driver supporting 1- to 48-multiplexing. Each
channel has an individually adjustable 65,536-step pulse-width-modulation (PWM) grayscale (GS) control. The
TLC6948 device implements 24 Kbits of display memory to increase the visual refresh rate and to decrease the
grayscale data writing frequency. This integrated memory makes TLC6948 a potential for high-density, fine-pitch
LED matrix applications.
10.2 Typical Application
The TLC6948 is typically connected in series to drive the LED matrix with only a few controller ports. Figure 16
shows a typical application diagram with TLC6948 devices connected in cascade for an LED matrix.
Figure 16. Cascading Three TLC6948 Devices
10.2.1 Design Requirements
For this design example, use the following as the input parameters.
Table 3. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
VCC and VLED voltage
3 V to 5.5 V
SIN, SCLK, LAT, and GCLK voltage range
Low level = GND, high level = VCC
The maximum LED forward voltage, V(F)
Red LED 2V, green and blue LED 3V
The maximum current for each color LED,
IOLCmax
Red LED 10mA, green LED 6mA, blue LED 4mA.


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