Automotive constant-current LED driver IC with 3 A output current

January 10, 2013 // By Christoph Hammerschmidt
The A6213 from Allegro MicroSystems Europe is a 3 A constant-current LED driver IC that has full AEC-Q100 automotive qualification and operates over a wide input voltage range from 6 to 48 V.

The device is a DC-DC buck switching regulator that provides a constant-current output of up to 3 A for driving high-power LEDs. It integrates a high-side, N-channel, MOSFET switch, and includes a range of innovative fault protection features.

The design of the A6213 is optimised for automotive use, and is targeted at a variety of applications in this sector including map lights, daytime running lights, rear fog lamps, fog lights, cargo and under-hood lamps as well as “puddle” and emergency lights.

A true average LED drive current is output using a cycle-by-cycle controlled “on” time method. The LED drive current is user-configurable using an external current sense resistor. The output voltage automatically adjusts to optimise constant-current supply to a wide variety of LED array configurations including multiple LEDs in series. Series LEDs can be configured in a single string or parallel strings using a balancing resistor. LED dimming is accomplished via a direct logic input pulse-width-modulation (PWM) signal such as an automotive courtesy signal. PWM dimming and enable signals can range from logic level (1.8 V) to the input voltage level.

The A6213 provides load supply and gate drive undervoltage lockout protection, thermal shutdown protection, and load overvoltage protection (OVP).

The device is provided in a compact 8-pin narrow SOIC package (suffix LJ) with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matt tin leadframe plating.

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