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Switching regulators drive high-brightness LEDs

Phoenix, Ariz.—ON Semiconductor has introduced the NCP3065 switching regulator 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.

NCP3065 is a 1.5-A monolithic switching regulator that features a 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.

According to On Semiconductor, the power dissipation in the sense resistor is reduced by 80 percent compared to competitive devices, which use a standard 1.25-V feedback voltage. This can result in up to 2 percent savings on the overall system efficiency, the company said. The internal reference voltage is trimmed to 2 percent to provide 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 Vac and 12 Vdc supplies commonly used for lighting applications and unregulated power supplies such as Lead Acid batteries.

The NCP3065 is also available in automotive grade as the NCV3065.

Pricing: The NCP3065 and NCV3065 are offered in a 4 mm x 4 mm DFN-8 package and priced at $0.32 per unit in 10,000 unit quantities. The devices are also offered in an SOIC-8 and a PDIP-8 package priced at $0.30 per unit in 10,000 unit quantities.
Availability: Now.
Datasheet: click here.

On Semiconductor, 1-602-244-6600, www.onsemi.com

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