ON Semiconductor NCP3065 constant current switching regulator for LED driver

brief introduction:
ON Semiconductor introduces the NCP3065 switching regulator designed to efficiently drive low-voltage lighting, viewing streetlights and solar lighting, halogen bulb replacement, and high-brightness light-emitting diodes (HB-LEDs) commonly used in automotive and marine lighting. .

The NCP3065 is a 1.5 amp monolithic switching regulator with an extremely low 235 millivolt (mV) feedback voltage. This feedback voltage is used to regulate the average current of the LED string in a constant current regulator configuration. This extremely low feedback voltage also allows designers to use more sensitive and cost-competitive sensing resistors. Compared to competing devices that use a standard 1.25 volt (V) feedback voltage, the NCP3065 reduces the power consumption of the sense resistor by 80%, resulting in an overall system efficiency improvement of 2%. The NCP3065's internal reference voltage is trimmed to 2%, providing extremely accurate and stable flow over a wide range of input voltages, LED forward voltages, and inductor tolerances.

With a wide input voltage range of 3V to 40V, the device can operate from 12Vac and 12Vdc power supplies commonly used in lighting applications and unregulated power supplies such as lead-acid batteries. The device can be configured as a controller topology with an external transistor to support a higher LED current than the 1.5A rated switching current of the internal transistor. The external switch also has a higher output voltage when using a boost configuration.

The NCP3065 also offers a version for the automotive grade application - NCV3065. Both the NCP3065 and NCV3065 are available in a 4mm x 4mm DFN-8 package and are priced at $0.32 per unit in 10,000 unit quantities. The devices are also available in SOIC-8 and PDIP-8 packages and are priced at $0.30 per unit in 10,000-piece quantities.

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