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High Power LED Flashlight Demonstration Brochure

High Power LED Flashlight Demonstration Brochure
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High Power LED Flashlight Demonstration Brochure - 1

High Power LED Flashlight Demonstration Intelligent Lighting & Control Solutions Summary Portable flashlights have been one of the earliest adopters of LEDs, and LED based flashlights are now the most prevalent solutions available on the market. However, many of these designs use simple resistor circuits that contribute to poor LED performance, decreased functionality, and diminished lifetimes. Industrial, military, and sport flashlight designers are some of the growing number of engineers recognizing the advanced control and functionality that a microcontroller (MCU) provides. With significantly longer lifetimes and better efficiencies than an incandescent bulb, LED lighting turns on instantly without any warm-up, provides accurate light placement, produces no radiated heat, and can perform well in both indoor and outdoor applications. The addition of an MCU powering & managing the LED provides opportunities for control of custom lighting patterns/ sequencing, user interface control, and increased efficacy (lm/W) resulting in longer battery life at greater lumen output. Additionally, an MCU implementation benefits from the ability to modify or add functionality via a simple program update versus a hardware redesign. The High Power LED Flashlight Demonstration is a collaborative platform showcasing the capabilities of Microchip, Cree®, Airspeed, and Energizer® The 10W, . > 1000 lumen premium flashlight, features a Microchip MCP1703, MCP14628 and PIC12F752 controlling a > 90% efficient buck power supply dropping 7.2V, supplied by Energizer® Ultimate Lithium batteries, to 3.3V/3.0A driving a single Cree XLamp® XM-L LED. The entire assembly fits inside an aluminium hard anodized enclosure, provided by Airspeed LLC, and is fully ruggedized for use in most any environment. With 1000 lumens at 10W, light output is approximately half of a single automotive headlamp while maintaining greater than 100 (lm/W) efficacy for efficient operation. To learn more about additional products and capabilities of Microchip’s lighting partners, visit: www.CREE.com www.energizer.com www.AirSpeedLLC.com 1000 Lumen XM-L LED Provided by CREE® LED Ultimate Lithium Batteries Provided by Energizer ® Mechanics, Optics, and Thermal Solution Provided by AirSpeed PIC12F752, MCP1703, MCP14628, and Reference Design Provided by Microchip Demonstration Highlights ■ > 90% efficient buck power supply ■ ~1000 lumen output at 10W • ~100 (lm/W) efficacy ■ Ruggedized anodized aluminum enclosure • Waterproof to 10 meters ■ Magnetic rotational mode selector ring ■ Multiple operating modes • Low power (60 lumens at 0.6W) • Medium power (200 lumens at 2W) • High power (1000 lumens at 10W) • SOS (customized lighting sequence) ■ Long life operation • Low power = 31 hours at 0.6W • Medium power = 8.5 hours at 2W • High power = 1.5 hours at 10W ■ Storage/operating temperature: -40°C to +85°C Resources The High Power LED Flashlight Demonstration collateral is available as a FREE download that includes all schematics and ‘C’ source code that can easily be modified to your specific application needs—download at www.microchip.com/HPLEDFlashlight. To learn more about Microchip’s lighting oriented products and solutions, go to www.microchip.com/lighting.

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High Power LED Flashlight Demonstration Brochure - 2

High Power LED Flashlight System Diagram Synchronous Buck Regulator controlled by PIC12F752 microcontroller for maximum efficiency **(4) AA Ultimate lithium batteries in series supplying 7.2V Interrupt on Change *Magnetic selector ring *Multiple Hall effect sensors to determine position of magnetic ring Comparator Input LED current ADC Input sense and Resistive feedback to Temperature sustain constant Controls operational modes Sensor ADC light output based on position of Input selector ring Real-time temperature monitoring of LED for fail-safe operation 5b Digital Analog Converter (DAC)...

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