TLC5954 Datasheet, PDF (16/45 Pages) Texas Instruments – TLC5954 48-Channel, Constant-Current LED Driver with Global Brightness Control, LED Open-Short Detection, and Power-Save Mode

TLC5954
SBVS241 – APRIL 2014
8 Detailed Description
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8.1 Overview
The TLC5954 is 48-channel, 34.9-mA or 24.4-mA, constant-current LED driver that can control the LED on of off
settings with the BLANK signal for grayscale (GS) control. The minimum 40-ns BLANK signal pulse duration can
be input to generate very short LED on-time.
The device has a 128-step, 7-bit, output current control function termed global brightness control (BC) that can
control each color group output. The BC function can adjust the red, green, and blue LED intensity for true white
with constant-current control. The device contributes higher image quality to LED displays with fine white balance
tuning by using these BLANK pulse durations and MC, BC functions.
The display controller can locate LED lamp failures via the device because the controller can detect LED lamp
failures with the LED open detection (LOD) and LED short detection (LSD) functions. Furthermore, the reliability
of the display can be improved by the LOD and LSD function.
The device maximum constant-current output value can be set by an internal register data function referred to as
maximum current control (MC), instead of the general method of using an external resistor setting. Thus, any
failure modes that occur from the external resistor can be eliminated. One resistor can also be eliminated with
the MC function.
The device constant-current output can drive approximately 17.4 mA at a 0.32-V output voltage and a +25°C
ambient temperature. This voltage is called knee voltage. This 0.32-V, low-knee voltage can contribute to the
design of a lower-power display system.
The total number of LED drivers on one LED display panel can be reduced because 48 LED lamps can be driven
by one LED driver. Therefore, designing fine-pitch LED displays is simplified.
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