Can I use a 15V power supply?

Jupiter
1

Hello!
Can I use a 15V power supply for my Jupiter? The docs state “12V/3A or above.”

Does this refer to the voltage as well?

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I think 12V/3A or “above” means the current, not voltage. should be only 12V ±5%

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I fully agree with Ho_Ryan

I checked the schematic for the Jupiter to confirm and on page 19 it is 12v for PoEIN, 12v for ATXIN, and TYPECIN it is not specified. So then I did a lookup on some of the parts around the voltages inputs

U40 (DC091-5521 DC connector rated for 5000 insert/remove cycles),
Q26 (FKBB3103 6.2 A Fast Switching MOSFETs),
D47 (SMBJ12A - 12 volt stand off voltage, Transient Voltage Suppressor diode)
D46 (MM3Z15VT1G - 15 volt zenier diode).

Any voltage over ~13.3 volts will ultimately end up being dissipated as heat by the D47 diode (until it eventually fails). Normally this parts primary function is to dissipate any transient voltages entering the circuit through contacts from static build up on human bodies. It is rated up to 600 Watts peak pulse power capability with a 10/1000 μs waveform, repetitive rate/duty cycle of 0.01 %)

So my guess, after speedreading the circuit, would be the absolute maximum power that could be provided is 13.3 volts, 6.2 amps. So with a bit of a safety factor called it 60 watts (so 12 volts @ 5A).

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Thanks a lot for the insight, I don’t have the know-how to read the electrical schematics. I ordered a different power supply. I have to note that 15/19V power supplies seem to be much more common than 12V.

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I love seeing schematics and source code, because the answer to almost any question I might have is usually in one, the other or both.

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