LED 1-5W驅(qū)動(dòng)解決方案

On Semi NCP3065 MR16 LED 1-5W驅(qū)動(dòng)解決方案

On Semi公司的NCP3065是高達(dá)1.5A恒流開關(guān)穩(wěn)壓器,輸入電壓從3.0V到40V,反饋電壓235mV,工作頻率可調(diào)整到高達(dá)250kHz,逐個(gè)周期限流,主要用在汽車照明,大功率LED驅(qū)動(dòng)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(yīng)用電路, 降壓演示板應(yīng)用電路和材料清單, 升壓演示板應(yīng)用電路和材料清單,以及1-5W MR16 LED驅(qū)動(dòng)GreenPoin解決方案框圖,應(yīng)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 Step−Down (Buck) and Step−Up (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

• Cycle−by−Cycle 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(yīng)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(yīng)用電路

圖3.NCP3065降壓演示板應(yīng)用電路

材料清單(BOM):

圖4.NCP3065升壓演示板應(yīng)用電路