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Supertex introduces two latest LED driver ICs for automotive LED lights


Supertex, Inc. today introduced the AT9917 and the AT9932, LED lamp driver ics, designed specifically for solid-state lighting applications in automobiles, such as LED head lights, LED tail lights, LED indicator lights, LED dome lights, and LED panel backlights. These ICs feature technology that is ideal for automotive applications.


The AT9917 uses a peak current mode control scheme to drive single switch converters and includes 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, making it perfect 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 combining 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 LED lighting applications," states Hernan DeGuzman, Vice President of Marketing for Supertex. "These excellent driver ICs allow automobile manufacturers to realize the numerous benefits of using LEDs in vehicular lighting for their applications.”

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