OnSemiNCL30160恒流高亮LED驱动解决方案

作者：时间：2012-06-12来源：网络收藏

On Semi公司的NCL30160是恒流高亮LED驱动器,集成了1.0A MOSFET,输入电压从6.3V到40V,开关频率高达1.4MHz,其滞后控制在负载瞬变和PWM调光时具有良好的电源抑制和快速反应,不需要控制回路补偿,可调整LED电流,主要用在LED驱动器,恒流源,汽车照明,通用照明和工业照明.本文介绍了NCL30160主要特性,方框图,应用电路以及评估板NCL30160GEVB主要特性,电路图,材料清单和评估板NCL30160GEVB测试程序.

NCL30160GEVB:Up to 40V, 1A NCL30160 LED Driver Buck Evaluation Board 1.0A Constant-Current Buck Regulator for Driving High Power LEDs

The NCL30160 is an NFET hysteretic step−down, constant−current driver for high power LEDs. Ideal for automotive, industrial and general lighting applications utilizing minimal external components.

The NCL30160 operates with an input voltage range from 6.3 V to 40 V. The hysteretic control gives good power supply rejection and fast response during load transients and PWM dimming to LED arrays of varying number and type. A dedicated PWM input (DIM/EN) enables wide range of pulsed dimming and a high switching frequency up to 1.4 MHz allows the use of smaller external components minimizing space and cost. Protection features include resistor−programmed constant LED current, shorted LED protection, under−voltage and thermal shutdown. The NCL30160 is available in a SOIC−8 package.

NCL30160主要特性:

• Integrated 1.0A MOSFET

• VIN Range 6.3 V to 40 V

• Short LED Shutdown Protection

• Up to 1.4 MHz Switching Frequency

• No Control Loop Compensation Required

• Adjustable LED Current

• Single Pin Brightness and Enable/Disable Control Using PWM

• Supports All−Ceramic Output Capacitors and Capacitor−less Outputs

• Thermal Shutdown Protection

• Capable of 100% Duty Cycle Operation

• This is a Pb−Free Device

NCL30160典型应用:

• LED Driver

• Constant Current Source

• Automotive Lighting

• General Illumination

• Industrial Lighting

图1.NCL30160简化框图

图2.NCL30160驱动一个LED的应用电路图(降压)

NCL30160GEVB:高达40V, 1A 的NCL30160 LED驱动器降压评估板

NCL30160GEVB主要特性:

Integrated MOSFET capable of 1.0 A

Input voltage range from 6.3 V to 40 V

Dimming capability using PWM

LED short protection

Thermal shutdown protection