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Up to 1.5 A Constant Current Switching Regulator for LEDs
The NCP3065 is a monolithic switching regulator designed todeliver constant current for powering high brightness LEDs. Thedevice has a very low feedback voltage of 235 mV (nominal) which isused to regulate the average current of the LED string. In addiTIon, theNCP3065 has a wide input voltage up to 40 V to allow it to operatefrom 12 Vac or 12 Vdc supplies commonly used for lighTIngapplicaTIons as well as unregulated supplies such as Lead Acidbatteries. The device can be configured in a controller topology withthe addiTIon of an external transistor to support higher LED currentsbeyond the 1.5 A rated switch current of the internal transistor. TheNCP3065 switching regulator can be configured in Step−Down(Buck) and Step−Up (boost) topologies with a minimum number ofexternal components.
