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Class D Switching Power Amplifiers and Power D/A conversion

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Old 8th January 2010, 08:35 PM   #121
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Default PCB for irs2092

Hello guys,

I'd like to ask to someone if please is possible to receive pcb files for the famous 6kw class d power amplifier....

please send me a copy at my mail fabiodord#libero.it

My intent it's refurbish a couple of old burned amplifier with a "lite" good class d power amplifier.

These amplifiers has a good power supply stage but all the power amp are burned and probably with the same cost I can replace the old AB class with the class D....

Thanks in advance
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Old 10th January 2010, 08:12 AM   #122
Baldin is offline Baldin  Denmark
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First of all, Happy New year to all of you
Nice to see some of the old guys and girls still being around, Eva, Pafi, Choco, Fredos .... I was begining to fear that class-d had become something with only single chip solutions on this forum

I have been working on a small prototype for some time (have had all to much to do at work to find time for class-d )
It's a "motherboard" for the switching part, based on 74HC86 for deadtime,IR2110 and just as a start IRF640. The intention is to make this switching part work well, and then being able to try out different modulator designs, by adding/changing a small board.
I have got it all to work in SODA mode now. The morar is running on +-30V at the moment. .... looks prommesing.

Anyway, Eva could you explain a litle more on this:

Quote:
Originally Posted by Eva View Post
- Add diodes from IR chip outputs to their rails to prevent latchup when the outputs are forced to exceed the rails.
- Add a diode from VS to COM to prevent the IR chip from failing due to excess negative spikes on VS. These diodes should be SMD to keep things small and low inductance.
Your sggestion/advice is to connect 4 diodes in all (in SE mode) ... see my drawing. Is that correct? What diodes are you using for this? Guess these dont have to rated very high Id wise.

The Vs to COM is ofcourse only necessary when using the IRS2092.

Quote:
Originally Posted by Eva View Post
- Add LC filters to supply rail inputs to prevent the HF ripple due to high current switching from reaching wirings.
What you are saying is just to as a couple of inductors, one to each rail ... see my drawing. Could you get by with just a couple of beads??
I'm guessing you are using beads in your design (not just in the rails). I'm not at all good at magnetics, so could you tell which beads you are using ... material, size ....
I guess that if these have too high peramability or are too small for the current used, they go into saturation and dosen't work at all .......

(Yes I know the output coil is to close to the input board on my PCB, but it dosen't seem to make any problems with the current quite low voltage PSU .... it will be changed on the next board ..... but I'm still not sure how to position it most correctly .... does anyone have a good drawing of how the leakage fields look like for a toroid coil?)

Best New Year wishes Baldin
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Last edited by Baldin; 10th January 2010 at 08:15 AM.
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Old 10th January 2010, 10:11 AM   #123
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Diodes should be:
from VSS to LO
from LO to VSS+12V
from VS to HO
from HO to VB

Anyway IR2110 and the likes seem to be happy with as much as 5V inductive override, there is an application note on IFR site describing parasiting diodes inside the chip and how can an inductive spike cause any trouble.

You may well end up not needing any of these diodes with proper layout and not-hyper-fast di/dt
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Old 10th January 2010, 12:34 PM   #124
Baldin is offline Baldin  Denmark
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Hi Darkfenriz

Ok, I understand the connection og the diodes.

I haven't had any problems yet, but I havent driven any of my designs very hard either, so there might still be problems

Do you remember which AP?

Thanks in advance Baldin
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Old 10th January 2010, 12:48 PM   #125
Baldin is offline Baldin  Denmark
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Default Deadtime and gate drive

From what I read in your post Eva, you are only introducing delay between driver and gate. Is that correct?

I'm using a 74HC86 at the input of the IR2110 driver, but would like to get rid of it all together, as it takes up space / adds complexity.
I was thinking of just skipping the 74HC86 but still use two separate RCDs on the two input pins .....
Any suggestions here???
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Old 11th January 2010, 09:02 AM   #126
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Dt 97-3
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Old 11th January 2010, 10:35 AM   #127
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Baldin,

The conenction of your diodes from high side gate to supply rail is WRONG, you cannot clamp gate of mosfet with rail, it will restrict the VGS to go above Drain voltage when mosfet TENDS to switch ON, with respect to source.
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Old 11th January 2010, 11:08 AM   #128
luka is offline luka  Slovenia
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Quote:
Originally Posted by Workhorse View Post
Baldin,

The conenction of your diodes from high side gate to supply rail is WRONG, you cannot clamp gate of mosfet with rail, it will restrict the VGS to go above Drain voltage when mosfet TENDS to switch ON, with respect to source.
you are right, fets gate would not go above vcc in order to turn on
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Old 11th January 2010, 03:46 PM   #129
Baldin is offline Baldin  Denmark
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Quote:
Originally Posted by luka View Post
you are right, fets gate would not go above vcc in order to turn on
Hi Luka and Workhorse
.... yes, yes, I actually got it when pointed out by darkfenriz
I just drew up what I thought I read the frst time ...... drawings tend to explain things much better, than many words


Thanks darkfenriz for the reference to the Design Tip ...... here is a link if anyone finds it hard to find: http://www.irf.com/technical-info/designtp/dt97-3.pdf

Baldin
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Old 11th January 2010, 09:27 PM   #130
djzafer is offline djzafer  Turkey
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PLEASE NEW UPLOAND
THIS LINK EROR
http://www.upload.in.th/index.php/fi...rs2092-6kw.pdf
THANK YOU
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