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Old 19th May 2017, 03:17 PM   #1
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Default Question regarding DC stepup

Im a little confused with this, i have a step up board that is converting 5 volts to 12 volts,

Heres the problem,

The amp cuts out at high volume with this setup yet if i give it a direct 12volt supply it is fine..

Now am i correct in thinking its something to do with ampage and thats why the stepup wont work? or am i missing something else?
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Old 19th May 2017, 03:53 PM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by stormrazer121 View Post
Im a little confused with this, i have a step up board that is converting 5 volts to 12 volts, The amp cuts out at high volume
with this setup yet if i give it a direct 12volt supply it is fine..
The DC/DC converter could be current limiting or folding back.
You may need a larger capacity supply that can handle the peak current demands.
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Old 19th May 2017, 04:00 PM   #3
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current limiting or folding back? can i change the Capacitors to accommodate this on the Boost board that i have?
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Old 19th May 2017, 04:11 PM   #4
rayma is offline rayma  United States
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Quote:
Originally Posted by stormrazer121 View Post
current limiting or folding back? can i change the Capacitors to accommodate this on the Boost board that i have?
A DC/DC converter has to be able to supply the peak current demands of the load at the maximum voltage output of the amplifier.
The current limit setting is part of the electrical/thermal design of the converter, and is not likely to be able to be increased safely.
Make sure that the input to the DC/DC converter is not sagging below the converter's minimum rated input.
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Old 19th May 2017, 07:37 PM   #5
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Ah i see, so what i need is a dc-dc converter that can output a higher current correct?
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Old 19th May 2017, 07:52 PM   #6
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What is the 5V supply? It is going to have to be able to supply about three times as much current as the amplifier is demanding
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Old 19th May 2017, 08:01 PM   #7
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its just a li-poly battery setup that provides 5volts i am unsure what the current is.

Just happen to have alot of li-poly batteries about that id like to use and recharge them via usb
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Old 19th May 2017, 08:14 PM   #8
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Ok, presumably if you turn the volume back down again the amp comes back to life?
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Old 19th May 2017, 10:20 PM   #9
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That is correct
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Old 19th May 2017, 10:50 PM   #10
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Ok, I just wanted to check that the 5V supply wasn't the limiting factor. Seems like it's the converter. If your amp is ok with either a 10 or 15 volt supply you could connect 2 or 3 batteries in series
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