ANP10

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APPLICATION NOTE ANP10
Using SP6685 Provide Tiny, Efficient, High Power Camera Flash Solution
Introduction
Feature sets cell phones PDAs expanding with latest models including built-in cameras video cameras. Today's cell phones offer megapixel resolution cameras whichthen necessitate more sophisticated flash technology. same time, consumers demand increasingly smaller form factors longer battery life, making circuit design challenging. Xenon flash lamps could provide high lumen flash capability used cell phones PDAs because they bulky. solutions more suited form factor requirements cell phones PDAs, only their small size also because they operate "torch" video mode. Until recently, solutions were only popular megapixel digital cameras, improvements technology made them viable solutions megapixel higher cell phone cameras. Sipex offers highest performance, extremely compact solution driving latest high light output LEDs, including Lumileds Luxeon Flash LEDs. Luxeon LEDs times brighter than conventional LEDs ideal applications cell phones, PDAs, digital still cameras digital camcorders.
Requirements Drivers Portable Electronics
While switcher based DC-DC converters offer efficiency small size required highcurrent drivers used battery operated portable equipment, they have fundamental drawback. Traditional switchers designed provide regulated voltage varying load currents. However, LEDs must driven with constant current generate predictable light output. typical switcher were used such application, would require using opamp additional circuitry, which undesirable space constrained applications. Besides constant current requirement, solution must also able either step-up step down input voltage from Lithium-ion battery depending where Li-ion battery discharge cycle.
SP6685 Charge Pump Solution
SP6685 operates either mode, providing constant current with either step-up step-down voltage. SP6685 eliminates need inductor because charge pump operation. With industry leading switching frequency 2.4MHz, SP6685 offers smallest solution
Nov28-06 RevB
ANP10: SP6685 Camera Flash Page
2006 Sipex Corporation
size. device available space saving package requires only small capacitors small resistors (0603 0402 size), making ideal choice small form factor applications
Figure Small, Efficient LXCL-PWF1 Luxeon Flash Driver using SP6685. This charge pump based design eliminates need inductor requires just small external components realize 700mA solution flash mode 200mA torch mode. SP6685 delivers efficiency thanks proprietary feature that enables automatically transition from buck mode boost mode based battery input voltage. This also ensures current does depend forward voltage. extremely output equivalent resistance reference voltage allow highest white flash brightness ultra dropout voltage. SP6685 also features very shutdown current, automatic soft-start mode limit inrush current, well over current, over voltage thermal-shutdown control.
Nov28-06 RevB
ANP10: SP6685 Camera Flash Page
2006 Sipex Corporation
further assistance: Email: Support page: Live Technical Chat: Sipex Application Notes: Sipexsupport@sipex.com
Sipex Corporation
Headquarters Sales Office South Hillview Drive Milpitas, CA95035 tel: (408) 934-7500 faX: (408) 935-7600
Sipex Corporation reserves right make changes products described herein. Sipex does assume liability arising application product circuit described herein; neither does convey license under patent rights rights others.
Nov28-06 RevB
ANP10: SP6685 Camera Flash Page
2006 Sipex Corporation

ANP10

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