Supertex Releases New and Improved Automotive LED Driver - AT9919
Aug 24, 2011 Supertex announced release of the AT9919 LED driver for automotive applications that not only saves board space, but also improves system reliability. It incorporates hysteric control of LEDs and high side current sensing.
According to official press release AT9919 is intended specifically for automotive head lights, tail lights, brake indicator lights, dome lights, and panel backlights. AT9919 is AEC-Q100 compliant, and drives LEDs using a buck topology. It is available in a compact, eight-lead, DFN package.
Because of the hysteretic control function of the IC, a constant output current to the LED string is maintained at all times, thereby improving the reliability and lifetime of the LEDs. LED brightness is achieved through a PWM control signal. The IC drives loads of up to 1.0A at over 90% efficiency from input voltages ranging from 4.5 to 40V.
"By accurately delivering a consistent current to LEDs in automotive applications, the AT9919 ensures consistent brightness and prolongs LED lifetimes," states Stephen Lin, Vice President of Marketing for Supertex. "The IC is available in a compact DFN package, and its high switching frequency reduces the need for many external components, which reduces both the size and the cost of the assembly."
The AT9919 is available in an eight-lead DFN package (AT9919K7-G). The part is RoHS compliant. Samples are available from stock. Pricing is US$0.98 each for the AT9919K7-G in 1K quantities.
Additional technical details are available from manufacturer: http://www.supertex.com/pdf/datasheets/AT9919.pdf
Author: Alice Jones
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