ON NCP3065 is the company's integrated 1.5 A switch of the monolithic switching regulators, the model can be configured as buck or boost mode, its input voltage from 3 V to 40 V, for high-brightness LED (HBLED) to provide constant current Power. Feedback low voltage to 235 mV, can-by-cycle and current limit, widely used in cars and ships lighting, high-power LED driver, and low-voltage current source LED lighting. NCP3065 this paper, the main performance, application circuit and Evaluation Board Circuit and list of materials used (BOM).
The NCP3065 is a monolithic switching regulator designed to deliver constant current for powering high brightness LEDs (HBLED). The device has a very low feedback voltage of 235 mV (nominal) which is used to regulate the average current of the LED string. In addition, the NCP3065 has a wide input voltage up to 40 V to allow it to operate from 12 Vac or 12 Vdc supplies commonly used for lighting applications as well as unregulated supplies such as Lead Acid batteries. The NCP3065 is a monolithic switching regulator designed to deliver constant current for powering high brightness LEDs (HBLED). The device has a very low feedback voltage of 235 mV (nominal) which is used to regulate the average current of the LED string. In addition , The NCP3065 has a wide input voltage up to 40 V to allow it to operate from 12 Vac or 12 Vdc supplies commonly used for lighting applications as well as unregulated supplies such as Lead Acid batteries.
The device 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. The NCP3065 switching regulator can be configured in Step-Down (Buck) and Step-Up (boost) topologies with a minimum number of external components. The device 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. The NCP3065 switching regulator can be configured in Step-Down (Buck) and Step - Up (boost) topologies with a minimum number of external components.
Characteristics:
Integrated 1.5 A Switch Integrated 1.5 A Switch
Input Voltage Range from 3 V to 40 V Input Voltage Range from 3 V to 40 V
Low Feedback Voltage of 235 mV Low Feedback Voltage of 235 mV
Cycle-by-Cycle Current Limit Cycle-by-Cycle Current Limit
No Control Loop Compensation Required No Control Loop Compensation Required
Frequency of Operation Adjustable up to 250 kHz Frequency of Operation Adjustable up to 250 kHz
Operation With All Ceramic Output Capacitors or No Output Operation With All Ceramic Output Capacitors or No Output
Capacitance Capacitance
Analog and Digital PWM Dimming Capability Analog and Digital PWM Dimming Capability
Internal Thermal Shutdown with Hysteresis Internal Thermal Shutdown with Hysteresis
Applications:
Automotive and Marine Lighting Automotive and Marine Lighting
High Power LED Driver High Power LED Driver
Constant Current Source Constant Current Source
Low Voltage LED Lighting(Landscape, Path, Solar, MR16 Replacement) Low Voltage LED Lighting (Landscape, Path, Solar, MR16 Replacement)
Figure 1. NCP3065 block diagram 
Figure 2. NCP3065 should be typical circuit 
Figure 3. NCP3065 3A buck Evaluation Board circuit diagram 1. NCP3065 3A buck Evaluation Board components list (BOM) 