jack_flash
Newly Enlightened
- Joined
- Aug 28, 2002
- Messages
- 28
While testing and measuring the ARC LS hybrid 400 mA I noticed, that current didn't increase much with voltages over 3.5 volt. From 3.5 to 5 volt current consumption was about 350 to 380 mA.
Common step up circuits are leading power through inductor and diode direct to the output, which means here the LS-LED. This should cause a maybe deadly current through the LED with input voltages above 3.3 volt.
But not here. The only thing I had everytime, esp. with voltages arround 2.5 volt, were current spikes above 1 amp.
So what's the circuit? (seems to work with a LT16xx chip because of behavior)
IMHO there is a Multifuse-Polyswitch added, which acts as a reversible fuse or current limiter.
Is this flashlight Most Stupid User (MSU) proof or not?
Common step up circuits are leading power through inductor and diode direct to the output, which means here the LS-LED. This should cause a maybe deadly current through the LED with input voltages above 3.3 volt.
But not here. The only thing I had everytime, esp. with voltages arround 2.5 volt, were current spikes above 1 amp.
So what's the circuit? (seems to work with a LT16xx chip because of behavior)
IMHO there is a Multifuse-Polyswitch added, which acts as a reversible fuse or current limiter.
Is this flashlight Most Stupid User (MSU) proof or not?
