High brightness LED driver

6 February 2008 Opto-Electronics

The NCP3065 switching regulator, produced by ON Semiconductor, is designed to efficiently drive high brightness LEDs (HB-LED) typically used in low voltage lighting, landscape path and solar lighting, Halogen bulb replacements, and automotive and marine lighting. Several reference designs are available that drive the industry's latest HB-LEDs in various buck, boost and SEPIC applications.

The NCP3065 is a 1,5 A monolithic switching regulator that features a very low feedback voltage of 235 mV. The feedback voltage is used to regulate the average current through the LED string in a constant current regulator configuration. The low feedback voltage also allows the use of a smaller and more cost competitive sense resistor. The internal reference voltage is trimmed to 2% to provide very accurate current regulation even with wide variations in input voltage, LED forward voltage and inductor tolerance.

The device has a wide input voltage range from 3 V up to 40 V to allow operation from 12 V a.c. and 12 V d.c. supplies commonly used for lighting applications and unregulated power supplies such as lead acid batteries. The devices can be configured in a controller topology with the addition of an external transistor to support higher LED currents beyond the 1,5 A rated switch current of the internal transistor. In a boost configuration, the external switch also enables the capability of higher output voltages.

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