OnSemiNCL30160恒流高亮LED驅(qū)動解決方案

作者：時間：2012-06-12 來源：網(wǎng)絡(luò)

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On Semi公司的NCL30160是恒流高亮LED驅(qū)動器,集成了1.0A MOSFET,輸入電壓從6.3V到40V,開關(guān)頻率高達1.4MHz,其滯后控制在負載瞬變和PWM調(diào)光時具有良好的電源抑制和快速反應(yīng),不需要控制回路補償,可調(diào)整LED電流,主要用在LED驅(qū)動器,恒流源,汽車照明,通用照明和工業(yè)照明.本文介紹了NCL30160主要特性,方框圖,應(yīng)用電路以及評估板NCL30160GEVB主要特性,電路圖,材料清單和評估板NCL30160GEVB測試程序.

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典型應(yīng)用:

? LED Driver

? Constant Current Source

? Automotive Lighting

? General Illumination

? Industrial Lighting

圖1.NCL30160簡化框圖

圖2.NCL30160驅(qū)動一個LED的應(yīng)用電路圖(降壓)

NCL30160GEVB:高達40V, 1A 的NCL30160 LED驅(qū)動器降壓評估板

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