Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A6278
Edited by the Electronicstalk Editorial
Team on 17 February 2006
Driver chip watches out for dodgy LEDs
An eight-channel constant-current latched LED driver IC incorporates open LED detection, allowing the user to quickly identify system problems.
The new A6278 from Allegro MicroSystems Europe is an eight-channel constant-current latched LED driver integrated circuit incorporating an open LED detection capability, allowing the user to quickly identify system problems The A6278 is a BiCMOS device which includes an 8bit CMOS shift register, accompanying data latches, and eight n-p-n constant-current sink drivers
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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The new device is available in several package options and with different levels of allowable package power dissipation.
The CMOS shift register and latches in the A6278 allow direct interfacing with microprocessor-based systems.
With a 3.3 or 5 logic supply, typical serial data-input rates are up to 25MHz.
An output delay feature is included to minimise the effects of ground current spikes for better EMI performance.
The LED drive current is determined by the user's selection of a single resistor.
A CMOS serial output permits cascade connections in applications requiring additional drive lines.
Open LED connections are detected and fed back to the host microprocessor through the serial data output pin.
Three package styles are provided for through-hole DIP, surface-mount SOIC and exposed-pad TSSOP applications.
Under normal operating conditions, a copper lead frame and low logic-power dissipation allow the dual-inline package to sink maximum rated current through all outputs continuously over the operating temperature range (90mA, 0.75V drop, +85C).
The A6278 is available in a lead (Pb) free version with 100% matte tin plated lead-frames.
This new device is targeted at large-format LED display applications in the industrial, medical and telecommunications markets.
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