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Class D Switching Power Amplifiers and Power D/A conversion

200W IRS2092 Amp for
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Old 15th April 2019, 09:33 AM   #421
serafis is offline serafis  New Zealand
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Quote:
Originally Posted by chermann View Post
Hi
i jumped into this thread and read quickly ....
what is the difference of the normal cheap IRS2092 boards (post 1) and the other amp baords L15D, L20D, L25D (didnt find) ??
i dont get the difference



thanks
chris
I'd guess its a matter of quality (of the PCBs themselves and the components) and the amp's performance and stability. I've read that digital amps can be sensitive to component placement, trace lengths, ground plane design and so on. But my 7-channel amp uses only LJM's L15D boards which are pretty close to the IRS2092 reference design and have worked flawlessly; I haven't tried the cheaper boards and they may be just fine - anyone else used them or have an opinion on them?

Cheers, Jon
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Old 15th April 2019, 10:42 AM   #422
chermann is offline chermann  Austria
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Originally Posted by serafis View Post
I'd guess its a matter of quality (of the PCBs themselves and the components) and the amp's performance and stability. I've read that digital amps can be sensitive to component placement, trace lengths, ground plane design and so on. But my 7-channel amp uses only LJM's L15D boards which are pretty close to the IRS2092 reference design and have worked flawlessly; I haven't tried the cheaper boards and they may be just fine - anyone else used them or have an opinion on them?

Cheers, Jon

thanks Jon...
i realized that the L15-L20-L25 types of amps/boards grows up with their voltage but i see that it is related to the dfferent IRF MOSFETS to handle the current/power.

chris
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Old 15th April 2019, 11:42 AM   #423
chermann is offline chermann  Austria
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hhhmmm... as more as i read about this IRS2092...its interesting...but i need not more amps
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Old 18th April 2019, 04:04 AM   #424
nigelwright7557 is online now nigelwright7557  United Kingdom
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Originally Posted by xrk971 View Post

Very nicely made, appear to be quality components
Appear to be quality components ?
How do you work that out by looking at them.
If you can that's very clever as I need test instruments to do that !

Got fed up with Chinese components after some blew up on me.
All I did was unplug a soldering iron !
So replaced bad components with genuine parts from RS Components and I couldn't blow them up no matter how much noise I put on the mains.
The fake parts obviously had a lower breakdown voltage to blow on a spike off the mains.

"Cheap", "ebay" or "Chinese" and I run for cover....
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Old 18th April 2019, 04:07 AM   #425
nigelwright7557 is online now nigelwright7557  United Kingdom
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Originally Posted by chermann View Post
hhhmmm... as more as i read about this IRS2092...its interesting...but i need not more amps
Excellent little IC.
But, a lot of care has to go into the circuit and pcb design.
Took me 3 revisions of pcb to get one that worked without resetting on high volumes.
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Old 20th April 2019, 09:27 PM   #426
troystg is offline troystg  United States
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A picture is worth a thousand words so here goes.

I want to make a 4 channel amp for a low powered office system. I need ~100w on the bottom and <25w on the top of a bi-amped system.

I really think one supply would do it but of course I would like to hear from someone who has been running these a while.


Comments? Please.



Old test rig that worked great!

P_20190420_133800.jpg

Proposed single supply:

P_20190420_161814.jpg

Undesired layout:

P_20190420_162120.jpg
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Last edited by troystg; 20th April 2019 at 09:34 PM.
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Old 21st April 2019, 05:02 PM   #427
xrk971 is offline xrk971  United States
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200W IRS2092 Amp for
Nice that you managed to get those Abletec's. I have a couple myself waiting for a project - and they work well with this amp.
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Old 21st April 2019, 05:11 PM   #428
xrk971 is offline xrk971  United States
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Hi Nigel,

Quote:
Originally Posted by nigelwright7557 View Post
Appear to be quality components ?
How do you work that out by looking at them.
If you can that's very clever as I need test instruments to do that !

Got fed up with Chinese components after some blew up on me.
All I did was unplug a soldering iron !
So replaced bad components with genuine parts from RS Components and I couldn't blow them up no matter how much noise I put on the mains.
The fake parts obviously had a lower breakdown voltage to blow on a spike off the mains.

"Cheap", "ebay" or "Chinese" and I run for cover....
The only time I have had Chinese no-name caps blow up on me was when I applied either reverse polarity on them, or over-voltage on them. I have seen some of them bulge and replace them before they go. However, the quality of the aluminum can and shrink wrap labeling often gives the cheap ones away. Someone showed that they got a bunch of relabeled fake caps ("Nichicon" branded) by stripping of the fake wrap to reveal a razor knick made by the unscrupulous vendor who stripped of the wrap from a no-name and slipped counterfeit labels on the fake ones.

With that said, I agree that caution is needed and one should always wear safety goggles and step back a good 6 ft when powering up a new amp the first time, with or without fake caps and let it sit for a few minutes to take care of explosions.

The caps on this IRS2092 amp have not blown up with +/-53v applied to them and appear to not have bulged so a good sign.

I have had problems with fake Toshiba 2SC5200/2SA1943 transistors.

For all quality or critical builds, I get all my actives from reputable source like Mouser/Digikey/Arrow now.

Cheers,
X
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Old 23rd April 2019, 06:08 AM   #429
chermann is offline chermann  Austria
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Quote:
Originally Posted by troystg View Post
A picture is worth a thousand words so here goes.

I want to make a 4 channel amp for a low powered office system. I need ~100w on the bottom and <25w on the top of a bi-amped system.

I really think one supply would do it but of course I would like to hear from someone who has been running these a while.


Comments? Please.



Old test rig that worked great!

Attachment 751016

Proposed single supply:

Attachment 751017

Undesired layout:

Attachment 751018

Hi Troy

meanwhile this amps is interesting me...
as i read you have to start with this - phase inverter - correct?
to avoid rail pumping
My design L20D IRS2092+IRFI4020H 200W8R
as i understand its working for 2 channels too- correct?


chris
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Old 23rd April 2019, 01:46 PM   #430
troystg is offline troystg  United States
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I don't know what bus pumping is and I don't think I had it on the old test rig.

Now does that mean I won't have it with 4 amps on one supply? I have no idea.

What does the little pcb with opamp do?
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