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LED lamp driver suits car solid-state lighting

Posted: 26 Jul 2010 ?? ?Print Version ?Bookmark and Share

Keywords:LED? driver? ICs? automotive?

Supertex Inc. launches the AT9917 and AT9932 LED lamp driver ICs for automobile head lights, tail lights, indicator lights, dome lights, and panel backlights.

The ICs feature technology that makes it suitable for solid-state lighting applications in cars. In the AT9917, these include a peak current mode control scheme to drive single switch converters and an internal transconductance amplifier to accurately control output current to the LEDs. It also includes a fault output using an external FET, to disconnect the LED string during erroneous conditions, such as an alternator load dump.

The AT9932, on the other hand, features a unique feed forward current control scheme, which achieves very low susceptibility to input voltage transients, making it indispensable for automotive LED lighting applications. The IC can maintain constant output current even under vigorous input transient conditions. Its output current control loop is inherently stable and can be compensated using a single capacitor with the appropriate damping at the coupling capacitor.

"By integrating features which allow use during input voltage transients caused by events such as cold crank conditions, the AT9917 and the AT9932 prove themselves to meet the rigorous requirements for automotive solid-state lighting applications," states Hernan DeGuzman, VP of marketing, Supertex. "These robust driver ICs allow automobile manufacturers to realize the numerous benefits of using LEDs in solidstate lighting for their applications."

The AT9917 and AT9932 are available in 24 lead TSSOP packages (AT9917TS-G & AT9932TS-G). The parts are RoHS compliant. Samples are available from stock. Pricing is $2.05 each for the AT9917TS-G and $2.23 each for the AT9932TS-G, both in 1K quantities.

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