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Topic: Absolute max input voltage to FIO (Read 543 times) previous topic - next topic

davaughn

Hi,

quick question: I'm using 4 3.7 Lithium batteries = 14.8V to wirelessly power an LED strip that my FIO activates.  I'd like to use the same pack to power my FIO, instead of having a separate battery or a separate connection of a subset of my existing battery pack.  The listed maximum is 12V and I've succesfully driven my FIO at 12V, but before I burn $30 and try more: has anyone tried putting ~15V through there? Will the Voltage Regulator burn out?

Also randomly, does anyone know where to buy the exact cable adapter that fits into the FIO battery slot? I've bought 2 types so far and the heads of the cables don't quite fit into the LiPo slot.

best,
John

MarkT

How much current does the FIO take in _your_ circuit?  Without that there's no way to calculate the dissipation in the regulator...

BTW you know voltage regulators shut themselves down on over current and over heating?
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Grumpy_Mike

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The listed maximum is 12V

Then that is what you have to use, go over that limit and all bets are off.
You need a regulator to take the voltage down but you need a few volts higher than you are regulating down to. Is it specified to run off 9V? If so then use a 9V regulator, standard ones can cope with 1 amp. You need the current to be able to work out how much power you are dissipating and hence the heat sink requirement.

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BTW you know voltage regulators shut themselves down on over current

That is only over current for the regulator of course not the device.

davaughn

the fio dissipates about 50mW @3.3V

MarkT

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the fio dissipates about 50mW @3.3V


You can only rely on that if you don't connect anything to it....
[ I won't respond to messages, use the forum please ]

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