UPC1237 speaker protection

jazzlap · 9th January 2012, 01:33 AM

Hi everyone,

I just finish my TDA2050 30W/channel amp and it works very well. Now I am just about to add a UPC1237 chip for speaker protection and here is my problem.

The datasheet of the UPC1237 sais that the overload detection fonction is not avalaible (on pin 1)

Can anybody help me with this.

Is there a external circuit that I could connect to this chip in order to give my amp an overload detection fonction?

Thanks

diy didi · 9th January 2012, 03:45 PM

That's a great question. I've searched far and wide, but no avail.
I'm sure someone on the forum will be able to help us.

pinkmouse · 9th January 2012, 04:28 PM

As always, Jan Didden is way ahead of us all.

http://www.linearaudio.nl/SOA-1.htm

diy didi · 18th January 2012, 05:50 AM

The link is about SOA??????

pinkmouse · 18th January 2012, 06:39 AM

Yes.

gmphadte · 19th January 2012, 03:58 AM

There is a clip detector circuit on the leach amp site. Knowing the IC functionality, u can use this ckt, IMO, but not sure.

Gajanan Phadte

jan.didden · 19th January 2012, 08:01 AM

Quote:

Originally Posted by jazzlap

[snip]The datasheet of the UPC1237 sais that the overload detection fonction is not avalaible (on pin 1)
[snip]Thanks

What they mean is that the overload detection circuitry is proprietory so they can't show it.
Pin one is a switching input that will switch off the relay when it is taken high. It's up to you to design a circuit that will make pin 1 high when there is an overload condition.

BTW Clipping is not understood as overload in the context of these kind of circuits - clipping is simply defined as 'clipping'

jan didden

gmphadte · 19th January 2012, 10:50 AM

Overload protection needs speaker/ic current detection. You have to include a resistor(of small value) either in series with the speaker or the power rails, one on each rail and detect the drop across each. Then use a comparator or opamp circuit.

Gajanan Phadte

jazzlap · 19th January 2012, 02:25 PM

thank janneman,
Now what will happen if I connect pin 1 directly to the ground.

gmphadte · 20th January 2012, 04:39 AM

It's time for u to read some fundas

9th January 2012, 01:33 AM	#1
jazzlap diyAudio Member Join Date: Jan 2012 Location: Near Montréal, Québec	UPC1237 speaker protection Hi everyone, I just finish my TDA2050 30W/channel amp and it works very well. Now I am just about to add a UPC1237 chip for speaker protection and here is my problem. The datasheet of the UPC1237 sais that the overload detection fonction is not avalaible (on pin 1) Can anybody help me with this. Is there a external circuit that I could connect to this chip in order to give my amp an overload detection fonction? Thanks

9th January 2012, 04:28 PM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	As always, Jan Didden is way ahead of us all. http://www.linearaudio.nl/SOA-1.htm __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

18th January 2012, 06:39 AM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Yes. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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9th January 2012, 03:45 PM	#2
diy didi diyAudio Member Join Date: Sep 2009 Location: Pretoria	That's a great question. I've searched far and wide, but no avail. I'm sure someone on the forum will be able to help us.

18th January 2012, 05:50 AM	#4
diy didi diyAudio Member Join Date: Sep 2009 Location: Pretoria	The link is about SOA??????

19th January 2012, 03:58 AM	#6
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	There is a clip detector circuit on the leach amp site. Knowing the IC functionality, u can use this ckt, IMO, but not sure. Gajanan Phadte

19th January 2012, 10:50 AM	#8
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	Overload protection needs speaker/ic current detection. You have to include a resistor(of small value) either in series with the speaker or the power rails, one on each rail and detect the drop across each. Then use a comparator or opamp circuit. Gajanan Phadte

19th January 2012, 02:25 PM	#9
jazzlap diyAudio Member Join Date: Jan 2012 Location: Near Montréal, Québec	thank janneman, Now what will happen if I connect pin 1 directly to the ground.

20th January 2012, 04:39 AM	#10
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	It's time for u to read some fundas

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