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Old 8th May 2011, 05:53 PM   #1111
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The spikes were with the old inductor as the pic show , 33uF or more idk , unknown value :/ .

The firts pic shows a nice filter and no spikes with 22uH@1uF.

I´ll upload more pics if my last test.
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Old 8th May 2011, 08:29 PM   #1112
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Quote:
Originally Posted by lorylaci View Post
Why the use of LM5106 would eliminate the level shifter? The common of LM5106 is still the souce of the low-side mosfet, so the negative supply rail. And it also drives less current (1,4A/1,8, while IR2110 is 2A min 2,5A typ), and effective dead-time can be set by RD network. It also has a maximum voltage of 100V. For those power levels there are all-in-one IC solution, and IR2110 is much easier to get, so I think IR2110 is better.
damn I forgot about the supply rails. It's better for me atleast because it's cheaper than the IR2110 and alot more cheaper than the SO14 package and space is one of my biggest concerns.. Maybe its not that cheaper at your area and 1.4Apeak is more than enough at the switching freq. and supply i'm running it at..

Last edited by ghabrius; 8th May 2011 at 08:32 PM.
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Old 9th May 2011, 07:38 AM   #1113
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is it possible to reference the the comparator to negative supply rail?
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Old 9th May 2011, 12:06 PM   #1114
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Quote:
Originally Posted by ghabrius View Post
is it possible to reference the the comparator to negative supply rail?
In a full-bridge design, it is easier, and more widespread.
It is also possible in half-brdige, but more complicated (common of output and input will not be common )
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Old 9th May 2011, 11:17 PM   #1115
opor is offline opor  Thailand
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Quote:
Originally Posted by lorylaci View Post
With +-42Vdc and with this big heatsink, heatsink should be cold. You should check for cross-conduction! (measure current from rails with no signal).
You should also check input nodes of comparator LM311 for transients from the output.
The PCB has the following improvements to do:
- bypassing should be close to the fets, exspecially ceramics for HF noise supression.
- the feedback path makes a loop just around the imput path (which also forms a loop)
- for filtering (specially HF noise) use ceramics
All these can cause high noise, since your supply lines are not well filtered (both main rails, and +-3V for LM311). I cannot see the main path of the ground line. As I can see the body of the TIP transistor is not connected to heatsink. Is the heatsink grounded? It can supress also noise too.
For double side PCB , is it good to do the ground plane on both side?
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Old 10th May 2011, 12:52 PM   #1116
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I have question about THD reduction in UCD using higher order circuit:

I tried many things ,but didn't have any success. Are there any successful projects with higher order loops? Similar to Putzeys "second prototype" where he gets 0,0005% thd values.

Did maybe Putzeys make any circuits and designs public available?
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Old 16th May 2011, 08:18 AM   #1117
rezamir is offline rezamir  Iran
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hi opor
when amp work ir2110 is warm
this is normal?
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Old 16th May 2011, 09:11 AM   #1118
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Quote:
Originally Posted by rezamir View Post
hi opor
when amp work ir2110 is warm
this is normal?
The dissipation depends on:
- operating frequency
- gate charge of FET
- gate resistor

It's in the datasheet of IR2110 how much it is. Check the graphs whether your dissipation is normal.
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Old 16th May 2011, 10:00 AM   #1119
fibko is offline fibko  Slovakia
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Default my prototype

This is my first prototype of UCD. 400W/4ohm sin @ +-60V
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Old 16th May 2011, 01:48 PM   #1120
rezamir is offline rezamir  Iran
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hi lorylaci
i build this amp and run @250khz
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