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Old 21st July 2012, 03:17 PM   #1
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Default 2 ohm load on TDA1562 with larger heatsink

So I've built amplifier with TDA1562 and it would be great if I could use it with 2 ohm load, unfortunately I can't find any info on how safe it is or isn't. Don't want to destroy the IC, but don't want to buy another one either.

So let's say if I used larger heatsink with the chip (so it's not overheating), can I still damage the IC?
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Old 22nd July 2012, 05:18 PM   #2
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Yes You can. There is a limit of current delivered.
Getting hot is just one thing.

You can use 2 ohm "safely" as a load if You place a resistive voltage divider at the IC inputs to make sure You do not cross the limit.
(actualy its the same as not turning up the volume.)
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Old 22nd July 2012, 06:12 PM   #3
a.wayne is offline a.wayne  United States
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Can't you run them in parallel ..(multiple chips )..?
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Old 22nd July 2012, 06:36 PM   #4
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I think you'd be ok using a 2 ohm load, but do check the current rating on the data sheet. You can also work out your maximum output power driving such a load by using the equation:

P = I*I*R

Where 'I' is the maximum output current R is the load impedance, and P is the maximum output power driving that load.

Hope that helps
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Old 22nd July 2012, 06:47 PM   #5
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Well, I tried the 2 ohm load, while I didn't damage the IC, I heard some glitches here and there so I think I'll just buy another IC so I have amp for both speakers (I got 2 speakers each 4 ohm, used them in parallel).

Btw the heatsink is becoming pretty much untouchable even with 4 ohm load, is it fine?
I had bought TDA1562 amp kit and heatsink came with it so I think it should be good, but not entirely sure.

Thanks for replies.
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Old 22nd July 2012, 06:50 PM   #6
Boscoe is offline Boscoe  United Kingdom
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Try lowering the supply voltage or increasing it to the max the chip can take and put the 4ohm speakers in series.
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Old 22nd July 2012, 06:53 PM   #7
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Boscoe: I'll use it as car amp, so what I get from the battery is what I have.
Anyways, 2 ohms shouldn't be a problem anymore if use 2 chips...
Just worried about heatsink being very hot.
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Old 22nd July 2012, 08:51 PM   #8
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use a fan maybe?
if it can't be touched, that means its probably too hot.
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