Two-channel linear LED driver IC addresses automotive interior lighting apps

Date
03/14/2013

Categories:
Driver Circuit, Power ICs

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The A6269 from Allegro MicroSystems Europe is a linear, programmable current regulator providing up to 200 mA from each of two outputs to drive arrays of high-brightness LEDs, and is designed for automotive interior lighting applications including map and dome lighting, glove box, vanity mirror, door ("puddle lamp") and trunk lights. The regulated LED current from each output is set by a single reference resistor. Current matching in each string is achieved without the need for ballast resistors. Dual control pins are available for both switch (on/off) and master control (on/off/dim-up/dim-down) signals. It is capable of driving two LED strings at up to 200 mA each. Outputs can be connected in parallel or left unused as required. Short-circuit detection is provided to protect the LEDs and the device during a short circuit to ground at any LED output pin. The output will automatically resume the regulated current when the short circuit is removed. A temperature monitor is included to reduce the LED drive current if the chip temperature exceeds an adjustable thermal threshold. The A6269KLJTR-T is available in an 8-pin narrow SOIC package with exposed pad for enhanced thermal performance. Allegro MicroSystems Europe

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