2 ohm load on TDA1562 with larger heatsink

Arvis · 21st July 2012, 03:17 PM

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?

Arty · 22nd July 2012, 05:18 PM

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.)

a.wayne · 22nd July 2012, 06:12 PM

Can't you run them in parallel ..(multiple chips )..?

monty78pig · 22nd July 2012, 06:36 PM

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

Arvis · 22nd July 2012, 06:47 PM

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.

Boscoe · 22nd July 2012, 06:50 PM

Try lowering the supply voltage or increasing it to the max the chip can take and put the 4ohm speakers in series.

Arvis · 22nd July 2012, 06:53 PM

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.

Arty · 22nd July 2012, 08:51 PM

use a fan maybe?
if it can't be touched, that means its probably too hot.

21st July 2012, 03:17 PM	#1
Arvis diyAudio Member Join Date: Jul 2012	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?

22nd July 2012, 06:36 PM	#4
monty78pig diyAudio Member Join Date: Aug 2011 Location: London	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 = IIR 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 __________________ With perfect linearity, it is impossible to go off on a tangent. Also; My Sziklai pairs are better than your MOSFETs/Darlingtons/Pentodes/Triodes

22nd July 2012, 06:50 PM	#6
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	Try lowering the supply voltage or increasing it to the max the chip can take and put the 4ohm speakers in series. __________________ I thought about it once, but then thought again.

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22nd July 2012, 05:18 PM	#2
Arty diyAudio Member Join Date: Feb 2011	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.)

22nd July 2012, 06:12 PM	#3
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Can't you run them in parallel ..(multiple chips )..?

22nd July 2012, 06:47 PM	#5
Arvis diyAudio Member Join Date: Jul 2012	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.

22nd July 2012, 06:53 PM	#7
Arvis diyAudio Member Join Date: Jul 2012	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.

22nd July 2012, 08:51 PM	#8
Arty diyAudio Member Join Date: Feb 2011	use a fan maybe? if it can't be touched, that means its probably too hot.

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