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Class D Switching Power Amplifiers and Power D/A conversion

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Old 27th March 2013, 01:40 PM   #301
norazmi is offline norazmi  Malaysia
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yes, it will work with proper design, sending u an email now.
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Old 27th March 2013, 02:28 PM   #302
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Quote:
Originally Posted by norazmi View Post
yes, it will work with proper design, sending u an email now.
Hi Azmi,

Im planning to put NE555 for the delay and an optocoupler for shorting the U1B output to ground. I also want to use LM311 for the comparator because I already used it in one of my prototype amps and achieved good results. But it will consume too much pcb space.

Did you experience good results with small signal transistor (eg. 2n5401) for current sensing trigger? If it is good, and doesn't have false trigger problems I think I will use it instead of LM311

Thanks

Last edited by jlester87; 27th March 2013 at 02:32 PM.
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Old 27th March 2013, 02:44 PM   #303
norazmi is offline norazmi  Malaysia
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idk, but using transistor is not good, sometimes your power transistor safe and some might not, and without delay is more worst happens. better you go with ne555 and LM311, so far it did good job with ucd amp that i already test before, yea little more space it not a problem .
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Old 28th March 2013, 10:17 AM   #304
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Thanks, I just created a daughter board that can be attached on top.
The protection circuit is already tested in my other class d amp.

Here's the preview
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File Type: png lester.PNG (173.3 KB, 753 views)
File Type: png protect.PNG (74.7 KB, 734 views)

Last edited by jlester87; 28th March 2013 at 10:23 AM.
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Old 28th March 2013, 10:47 PM   #305
norazmi is offline norazmi  Malaysia
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good pcb, but the protection circuit need to be test
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Old 29th March 2013, 06:15 PM   #306
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Another way to accomplish a super simple class d amp if lots of power is not the goal is to use mosfet gate drivers as output stages. Though with IXDD430 and BTL mode around 100 watts is possible into 4 ohms as these gate drivers can take up to 40V wheres the others are limited to max 18-20V.

Heres a BTL UcD i prototyped using UC3710's as output stages:
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Old 7th April 2013, 11:38 AM   #307
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Quote:
Originally Posted by norazmi View Post
good pcb, but the protection circuit need to be test
Hi no need to test the protection circuit, as I said before the protection works flawlessly on my other class d that I've created.
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Old 7th April 2013, 12:20 PM   #308
norazmi is offline norazmi  Malaysia
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thats working irs1500D o4 irs3000D from detex audio which this circuit already meet the requirement for the protection, but we are talking about this cheap class D and let see if it will working same way.
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Old 7th April 2013, 05:51 PM   #309
stewin is offline stewin  Kenya
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hi all you can use manojs protection which is good and working it is discreet and uses 555timer to shutdown ir2110 but in this case it can be modified to fit this amp.
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Old 11th April 2013, 10:39 PM   #310
stewin is offline stewin  Kenya
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hi all i made the few modifications .now it is better and can run with 2n5401 and 2n5551 as drivers.
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File Type: jpg 200wts pcb correction.jpg (143.0 KB, 373 views)
File Type: jpg 200wts schema correction.jpg (340.2 KB, 375 views)
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