LED 1-5W驱动解决方案

On Semi NCP3065 MR16 LED 1-5W驱动解决方案

On Semi公司的NCP3065是高达1.5A恒流开关稳压器,输入电压从3.0V到40V,反馈电压235mV,工作频率可调整到高达250kHz,逐个周期限流,主要用在汽车照明,大功率LED驱动器,恒流源已急低压LED照明.本文介绍NCP3065主要特性, 方框图, 典型降压应用电路, 降压演示板应用电路和材料清单, 升压演示板应用电路和材料清单,以及1-5W MR16 LED驱动GreenPoin解决方案框图,应用电路和材料清单.

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 wit电感器生产厂家h 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

&bu大功率电感贴片电感器ll; Internal Thermal Shutdown with Hysteresis

• Automotive Version Available

NCP3065应用:

• Automotive and Marine Lighting

• High Power LED Driver

• Constant Current Source

• Low Voltage LED Lighting

(Landscape, Path, Solar, MR16 Replacement电感器参数)

图1.NCP3065方框图

图2.NCP3065典型降压应用电路

图3.NCP3065降压演示板应用电路

材料清单(BOM):

图4.NCP3065升压演示板应用电路

材料清单(BOM):



图5.NCP3065降压演示板应用电路(2)

材料清单(BOM):


1-5W MR16 LED驱动GreenPoin解决方案

This reference document describes a built and tested, GreenPoint® solution for a 1 to 5WLED driver for MR16 LED replacement. The circuit is proposed for driving HB--LED (high--brightness LED) in a variety of lighting applications but is configured in size and features for an MR16 LED replacement. Configurations like this are found in 12 Vac / 12 Vdc track lighting applications, automotive applications, and low voltage AC landscaping applications as well as大电流电感 task lighting such as under--cabinet lights and desk lamps that might be powered from standard off--the—shelf Vac wall ad大电流电感apters.

The circuit is based around the ON Semiconductor NCP3065 operating at ~150 kHz in a non—isolated configuration. A key consideration in this design was achieving flat current regulation across input line variation and output voltage variation with a 12 Vac input. It also features an auto--detect circuit in combination with the NCP3065 which allows input from a 12 Vdc or 12 Vac supply and still maintain targeted output current regulation.

高频开关电源系统的主要技术参数探讨高频开关电源额定直流输出电压、浮充电压、均充电压、功率因数、稳压精度、效率、杂音电压(不接蓄电池组) 、电池温度补偿等。 1、额定直流输出电压：指市电经整流模块变换后的额定输出电压，正选的电源电压为-

功率MOSFET的锂电池保护电路设计铅酸电池具有安全、便宜、易维护的特点，因此目前仍然广泛的应用于电动自行车。但是铅酸电池污染大、笨重、循环次数少，随着世界各国对环保要求越来越高，铅酸电池的使用会越来越受到限制。磷酸铁锂电池作为一种新型

大功率LED照明系统散热问题的解决方案以单片机AT89C51为控制核心，将半导体制冷技术引入到LED散热研究中，采用PID算法和PWM调制技术实现对半导体制冷片的输入电压的控制，进而实现了对半导体制冷功率的控制，通过实验验证了该方法的可行

 1/2    1 2 下一页 尾页