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The A6270-1 is a linear, programmable current controller capable of accurately regulating LED current in two strings with external MOSFETs. The LED current can be switched between high current and low current for Stop/Tail or DRL/position applications. The two LED current levels from each output are set by two sense resistors. Current reference accuracy for each string current is better than ±4%.
Driving LEDs with constant current ensures safe operation with maximum possible light output. ICs can be connected in parallel in a master-slave arrangement for larger lighting applications.
Drain short-to-ground detection is provided for both external MOSFETs. The A6270-1 also offers MOSFET drain short-to- VIN and open LED fault protection. The MODE pin controls the action of the IC in case of a fault.
A temperature monitor is included to reduce the LED drive current if the chip temperature exceeds a thermal threshold.
An input voltage monitor is included to reduce LED current if VIN rises above 17 V. The device package is a 16-pin TSSOP (LP), with exposed pad for enhanced thermal dissipation. The package is lead (Pb) free, with 100% matte-tin leadframe plating.