Web1 The battery level is too low Confirm that your phone's battery is sufficient. Charge your phone until the battery level is over 15% and try again. If the battery level is low, your phone's flashlight can't be turned on. 2 Your phone or the flashlight is overheating If your phone or the flashlight is overheating, wait a while until it cools down. WebLED forward voltage. This kind of solution can be used, for instance, in a flashlight in which the regular bulb is to be replaced with a high current LED device (350mA typical). In this case, a boost topology implementation is mandatory. In battery powered applications, the input voltage varies with the battery discharge profile.
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