Supertex has introduced the AT9917 and the AT9932, LED lamp driver ICs designed specifically for solid-state lighting (SSL) applications in automobiles, such as head lights, tail lights, indicator lights, dome lights and panel backlights.
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. 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.
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