Product category:
Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2006-) | Subject: TLC5942 and TLC5945
Edited by the Electronicstalk Editorial
Team on 08 November 2007
LED drivers provide high-quality video
The TLC5945 is optimised for video displays with fast video action, such as stadium sporting events, as it provides a very fast refresh rate capability with no delay.
Texas Instruments has released two 16-channel, constant-current sink, light-emitting diode (LED) drivers with dot correction and greyscale on one integrated circuit (IC) for high-quality video The drivers give designers increased system reliability and dynamic brightness control to enhance the resolution for large-panel mono, multi or full-colour LED displays, LED signboards and display backlighting
This article was originally published on Electronicstalk on 4 Apr 2006 at 8.00am (UK)
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The TLC5942 and TLC5945 provide analogue and digital dimming in an integrated IC for large LED displays.
The TLC5942 provides 128-step dot correction to compensate for LED luminous mismatch and allows for both greyscale control and dot correction to be accessible via separate, dedicated serial interface ports.
The maximum current value of all 16 channels can be set by a single external resistor.
Higher currents can be provided by paralleling channels.
The TLC5945 is optimised for video displays with fast video action, such as stadium sporting events, as it provides a very fast refresh rate capability with no delay.
Both the TLC5942 and TLC5945 have two error detection circuits for LED open detection (LOD) and a thermal error flag (TEF).
The LOD identifies a broken or disconnected LED during the display period.
TEF indicates an over-temperature condition, meaning when the TEF is set, all output drivers are turned off.
When the device has cooled the TEF is cleared and all output drivers are restarted.
TI has also released the TLC5916 and TLC5917, eight-channel LED drivers that support general-purpose LED display systems such as LED signage, automotive LED lighting, white goods, gaming machines and entertainment and other general LED lighting applications.
The devices provide constant-current control and open-load, shorted-load and over-temperature detection.
Both also contain an 8bit shift register and data latches, which convert serial input data into individual channel on/off control and group brightness.
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