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1.1
Overview
The TLC6946 and TLC6948 devices are 16-channel constant-current sink LED drivers supporting 1- to 32-
and 1- to 48-multiplexing, respectively. Each channel has an individually adjustable 65,536-step pulse-
width modulation (PWM) grayscale (GS) control. The TLC6946 and TLC6948 devices implement 16Kb
and 24Kb display memory, respectively, to increase the visual refresh rate and to decrease the grayscale
data-writing frequency.
The TLC6946 and TLC6948 devices support current from 0.3 mA to 25 mA for each channel, with 1%
typical channel-to-channel deviation and 1% typical device-to-device deviation. The maximum current
value of all 16 channels is set by an external IREF resistor, and can be adjusted by the 128-step global
brightness control (BC). The device also implements low-grayscale enhancement technology to solve the
coupling issue and improve the display quality in low-grayscale conditions. These features make the
TLC6946 and TLC6948 devices more suitable for high-density multiplexing LED-matrix-display and LED-
panel applications.
The TLC6946 and TLC6948 devices integrate enhanced circuits to solve the various display issues in fine-
pitch LED display applications: the low-grayscale uniformity issue, coupling issue, ghosting issue, and
caterpillar issue. The TLC6946 and TLC6948 devices feature an LED-open detection function, and the
error detection results can be read via a serial-data interface port. Thermal shutdown and IREF-resistor
short protection help ensure high system reliability. The TLC6946 and TLC6948 devices also have a smart
power-save mode that sets the total current consumption to 1 mA (typ) when all outputs are off.
1.2
Features
•
Power Supply Voltage Range
– V
Voltage Range: 3 V to 5.5 V
CC
– V
Voltage Range: up to V
LED
•
16 Constant-Current-Sink Channels
– 0.3 mA to 25 mA (3 V ≤ V
– Channel-to-Channel Current Deviation: ±1% (typ), ±3% (max)
– Device-to-Device Current Deviation: ±1% (typ), ±3% (max)
– Low Knee Voltage: 0.3 V (typ) at 10 mA
•
7-Bit (128 Steps) Global Brightness Control (BC)
•
16-Bit (65,536 Steps) Enhanced Spectrum PWM Grayscale Control
•
Built-In 16K-bit Memory Supports 32-Multiplexing (TLC6946)
•
Built-In 24K-bit Memory Supports 48-Multiplexing (TLC6948)
•
LED Display Performance Enhancement
– Low-Grayscale Uniformity Improvement
– Low-Grayscale Coupling-Issue Elimination
– Ghosting Removal
– Caterpillar Elimination
•
High-Speed Serial-Data Interface
– Data Transfer Rate: 33 MHz (max)
SLVUBF4A – February 2018 – Revised June 2019
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+0.3 V
CC
≤ 5.5 V)
CC
Copyright © 2018–2019, Texas Instruments Incorporated
SLVUBF4A – February 2018 – Revised June 2019
Introduction
Chapter 1
7
Introduction
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