On Semi NCP3065 MR16 LED 1-5W驅動解決方案

On Semi公司的NCP3065是高達1.5A恒流開關穩壓器,輸入電壓從3.0V到40V,反饋電壓235mV,工作頻率可調整到高達250kHz,逐個周期限流,主要用在汽車照明,大功率LED驅動器,恒流源已急低壓LED照明.本文介紹NCP3065主要特性, 方框圖, 典型降壓應用電路, 降壓演示板應用電路和材料清單, 升壓演示板應用電路和材料清單,以及1-5W MR16 LED驅動GreenPoin解決方案框圖,應用電路和材料清單.

NCP3065, NCV3065: Up to 1.5 A Constant Current Switching Regulator for LEDs The NCP3065 is a monolithic switching regulator designed to deliver constant current for powering high brightness LEDs. 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 StepDown (Buck) and StepUp (boost) topologies with a minimum number of external components.

NCP3065主要特性:

Integrated 1.5 A Switch

Input Voltage Range from 3.0 V to 40 V

Low Feedback Voltage of 235 mV

CyclebyCycle Current Limit

No Control Loop Compensation Required

Frequency of Operation Adjustable up to 250 kHz

Operation with All Ceramic Output Capacitors or No Output Capacitance

Analog and Digital PWM Dimming Capability

Internal Thermal Shutdown with Hysteresis

Automotive Version Available

NCP3065應用:

Automotive and Marine Lighting

High Power LED Driver

Constant Current Source

Low Voltage LED Lighting

(Landscape, Path, Solar, MR16 Replacement)

圖1.NCP3065方框圖

圖2.NCP3065典型降壓應用電路

圖3.NCP3065降壓演示板應用電路

材料清單(BOM):