Electronics > Projects, Designs, and Technical Stuff

LED flashlight regulated vs unregulated?

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tunk:
You can find tests of some LED drivers here: https://lygte-info.dk/info/indexLedDrivers%20UK.html

Datman:
Some 3W flashlights with lithium rechargeable battery doesn't have a regulator or a series resistor. They only rely on the wires resistance and the LED internal resistance. So, a similar flashlight draws something like 1.4A at full charge, while maximum LED current is about 1A, and current decreases during discharge of the battery.
Many years ago I bought in a shop a flashlight very similar to this:
https://www.amazon.it/Levoluzione-della-Torcia-Militare-autorit%C3%A0/dp/B00DEXFLWC
I opened it and I saw that there wasn't a regulator inside, and current was much higher than maximum admissible current for the LED, then I modified the flashlight adding three AMC7135PKFA paralleled to obtain a total current of about 1A. Their dropout voltage is only 120mV, then nominal current is guaranteed until battery voltage is only 0,12V more than LED conduction voltage.

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