采用电荷泵的照相手机闪光灯解决方案

采用电荷泵的照相手机闪光灯解决方案AN-102
AAT3110-4.5 Application Note Cell Phone Camera Flash Solution Using the AAT3110-4.5 Charge Pump
General Description
Cell phone cameras are now prevalent in the market place. These cameras are capable of taking still pictures and some are able to record short segments of video in "movie-mode." One limitation to these phone cameras is the lack of proper lighting sources for nighttime photos and video. A standard capacitor-charged flash is fine for still photos, but it cannot provide a constant light source for movie-mode recording. Most constant light sources do not provide the luminous intensity needed for a camera flash.

Application Problem
A small bank of three or four white light emitting diodes (LEDs) can be used to provide a constant background light for nighttime movie-mode re