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How many watts can the STK4221II IC output at 4 ohms?
How many watts can the STK4221II IC output at 4 ohms?
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Old 21st September 2013, 12:21 PM   #1
techgeek72 is offline techgeek72
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Default How many watts can the STK4221II IC output at 4 ohms?

The STK4221II IC can output 80 watts at 8 ohms.

How many watts can the STK4221II output at 4 ohms?
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Old 21st September 2013, 01:45 PM   #2
KatieandDad is offline KatieandDad  United Kingdom
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The datasheet only specifies the output at 8 Ohms = 80W.

I would summize that it can't go as low as 4 Ohms.
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Old 21st September 2013, 03:40 PM   #3
FoMoCo is offline FoMoCo  United States
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Most likely it will run out of current, so a good estimation is one half rated power into half the impedance. You'd also want to use the lowest supply voltage possible as the extra voltage only produces extra heat.

While it's not true that it can't handle a 4 ohm load, it will be severely limited in power output. It may even die if not fully protected and you do something dumb with it. You'd be better off with a better match to your load.
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Old 21st September 2013, 04:30 PM   #4
KatieandDad is offline KatieandDad  United Kingdom
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Can you substantiate how it will handle a 4 Ohm load ?
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Old 21st September 2013, 04:36 PM   #5
AudioSan is offline AudioSan  Norway
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as long as one don't know the current limit, this will all be guessing.
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Old 21st September 2013, 04:50 PM   #6
KatieandDad is offline KatieandDad  United Kingdom
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Unfortunately the datasheets are very poor. The STK4122 II was specified at 80W / 8 Ohm. There might be other information available with user instructions from units that used these chip amps.
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Old 21st September 2013, 05:07 PM   #7
FoMoCo is offline FoMoCo  United States
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Quote:
Originally Posted by AudioSan View Post
as long as one don't know the current limit, this will all be guessing.
Very true. But a safe assumption is that maximum output into 8 ohms is also close to current limit. It's probably a bit more, but short of measuring it, we don't know.

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Originally Posted by KatieandDad View Post
Can you substantiate how it will handle a 4 Ohm load ?
Yes. Just take a course in electronics.
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Old 21st September 2013, 05:45 PM   #8
KatieandDad is offline KatieandDad  United Kingdom
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I've got a degree in electronics.

As AudioSan stated, you can only suppose.

If the output devices are running at maximum current iaw with the datasheet then the maximum power will be halved.

You could always add your fuses to see what blows first.

Last edited by KatieandDad; 21st September 2013 at 05:49 PM.
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Old 21st September 2013, 05:54 PM   #9
FoMoCo is offline FoMoCo  United States
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Quote:
Originally Posted by KatieandDad View Post
If the output devices are running at maximum current iaw with the datasheet then the maximum power will be halved.
I'm pretty sure I already said that before you made your remark about me needing to substantiate my claim.
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