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Old 4th October 2012, 06:34 PM   #1
rsavas is offline rsavas  Canada
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Default LME49830+LatFET, yet another for design review

Hello DIY'ers,

I have done my own home brew version of this design. I would appreciate if anyone can look it over, comment or find mistakes or suggest improvements.
Obvoiusly, I have to thank Owen(OPC) for offering his design as inspiration to me and others,documenting his design/version and providing all the information, thanks for that. Other members, like AndrewT, have provided me with useful information as well.
In my implementation, I plan to fab in only 2-layers, as see no need for more and it is an additional expense, to take it to more layers.
I contemplated adding source resistors, but the design/layout does not have them at this point. You will notice that some large solder pads for the grounds are thermal relieved and I have purposely left it that way, so you could see the connections. I will make them full contact vias/pads when I generate the gerber data.
I placed 4 MOSFET's, but you are not required to use all 4 of them.
I also used zeners for protection, but they are also optional.
Thanks to anyone providing feedback.
I will not do one of these group buy things, as I want to make,test it to be sure and want any mistakes to me mine alone and not be responsible to others, at this time.
Okay, so I will attach some information for review, lets see how this goes, as I have never done this before.
Not so good, I am limited on what I can upload, so all we get is a schematic, I will try to load the rest in another post!!

Thanks
Rick
Attached Files
File Type: pdf LME49830+LatFET-A0_ PAGE1.pdf (29.7 KB, 458 views)

Last edited by rsavas; 4th October 2012 at 06:35 PM. Reason: Inform users that I can not upload all the files I want too
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Old 4th October 2012, 06:41 PM   #2
wahab is offline wahab  Algeria
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For redundancy purpose it would be better to use three parraleled 30R
resistors for the output network rather than three 3.3R resistors in serial....
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Old 4th October 2012, 06:42 PM   #3
rsavas is offline rsavas  Canada
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Default Limited in what I can upload!!

So much for trying to load the layout information, for review, this site has some strict limits that I have to figure out how to work around!!
It is the layout information which is a critical part of the review process!!

Sorry about that, can anyone offer me some help here?

Thx Rick
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Old 4th October 2012, 06:45 PM   #4
rsavas is offline rsavas  Canada
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Default Wow, that was fast!! Great

1) Okay, suggest to use (3) R's in parallel rather than in series for the Zobel
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Old 4th October 2012, 06:49 PM   #5
Mooly is online now Mooly  United Kingdom
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Have you tried putting files in a zipped folder ? As long as the size is OK it gets round file formats that won't attach.
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Old 4th October 2012, 07:01 PM   #6
rsavas is offline rsavas  Canada
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Default Let's try a zip file!!

Okay, it works,

Thx "Mooly"
Attached Files
File Type: zip LME49830+LatFET.zip (268.0 KB, 165 views)

Last edited by rsavas; 4th October 2012 at 07:27 PM. Reason: Spelling mistake, never was very good in English class!!
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Old 4th October 2012, 07:04 PM   #7
Mooly is online now Mooly  United Kingdom
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Your welcome
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Old 4th October 2012, 07:13 PM   #8
rsavas is offline rsavas  Canada
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Default C8 is Back-***-wards

Okay, I admit, I make mistakes!!
Even filters out my foul mouth, that was Back-a_s_s-wards!! See if you can filter this one!!
Attached Files
File Type: pdf LME49830+LatFET-A0_ PAGE1.pdf (29.7 KB, 205 views)

Last edited by rsavas; 4th October 2012 at 07:16 PM. Reason: Spelling mistake
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Old 6th October 2012, 12:05 PM   #9
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We don't need source resistors for this MOSFET in parallel?

Last edited by panson_hk; 6th October 2012 at 12:18 PM.
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Old 6th October 2012, 02:12 PM   #10
rsavas is offline rsavas  Canada
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Hello panson_hk,

Thanks for your review of my submission and previous work that you have submitted in this web site. It depend on how good the pairs are matched and what degree of current sharing is required. I have contemplated adding them and now with your input' I will add these ballast resistors. I found a part that I would like to use, it will be SM, OHMITE FCSL119 (5Watt)

1) Use (3) 30ohm in parallel rather than in series for the Zobel
2) Ballast resistors on source follower leads. Use Ohmite RES 0.050 5W OHM 1% FOIL WIDE (FCSL119R050FER)

Thanks
Rick
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