原标题：安森美LED驱动方案

　　LED在光输出、能效及成本方面得到了全面改善，同时具备了小巧、低压工作及环保等众多优势，应用范围也在不断拓宽。未来，LED照明在通用照明、LCD背光、汽车照明等领域的增长前景尤为可观。安森美半导体提供丰富的LED驱动器产品，可满足各种LED照明应用需求。

　　主要特性：

　　_Integrated 1.5 A Switch

　　_Input Voltage Range from 3.0 V to 40 V

　　_Low Feedback Voltage of 235 m 　V

　　_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 Therma 　l Shutdown with Hysteresis

　　_Automotive Version Available

　　主要应用：

　　_Automotive and Marine Lighting

　　_High Power LED Driver

　　_Constant Current Source

　　_Low Voltage LED Lighting

　　方案特性：

　　LEDs are replacing traditional incandescent and halogen lighting sources in architectural, industrial, residential and the transportation lighting. The key challenge in powering LED’s is providing a constant current source. The evaluation board for the NCP3065/NCV3065 can be easily configured for a variety of constant current buck and boost

　　LED driver applications.

　　It describes a DC−DC converter circuits that can easily be configured to drive LEDs at several different output currents and can be configured for either AC or DC input. The NCP3065/NCV3065 can be configured in a several driver topologies to a drive string of LEDs: be it traditional low power LEDs or high brightness high power LEDs such as the Lumileds Luxeonâ K2 and Rebel series, the CREE XLAMPâ 4550 or XR series, the OSRAM OSTARâ, TopLEDâ and Golden Dragonâ.

　　方案原理图：

　　参照PCB图：