Supertex's LED Lamp Drivers For Automotive Solid-State Lighting Applications
Jul 27, 2010 Supertex Inc.offers two collections of LED lamp drivers, the AT9917 and AT9932 LED lamp driver ICs for car solid-state lighting, such as automobile head lights, tail lights, indicator lights, dome lights, and panel backlights.
The AT9917 features 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 features a unique feed forward current control scheme, which achieves very low susceptibility to input voltage transients. 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.
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.
Author: BIO T&T
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