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Old 11th May 2009, 12:33 AM   #131
fab is online now fab  Canada
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Quote:
Originally posted by cuibono
Thanks for your input! I've been looking at a lot of other LME chip family designs, and they almost always have resistors between the the gate drive lines (even the LME49830 pdf has them - often the value is around 12k total). Interesting that yours don't. Where did you get them?
The schematics I have from http://www.chp-pcb.cn/ has protection diodes (zener in series with 1N4148) instead of the 12k resistors. This schematics is propriatery of this company so I suppose I can not put it here. This is standard practice to protect mosfet. However, this web site is off-line since a few days...
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Old 11th May 2009, 11:28 PM   #132
cuibono is offline cuibono  United States
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So I've tried a number of things: I heated and pulled off all the copper on the pcb that was filling unused space. Tested that. Then I cut off the output section and re-did it point to point on the heatsink. Tested that. The results? No difference in the square wave ringing. So I doubt the layout has anything to do with it.

I tried adding 6.8k resistors in the Rbo positions - didn't do anything.

I tried different values of compensation caps (going from 20pF to 22 then 27). Didn't do anything.

What else could I try?
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Old 14th May 2009, 03:47 PM   #133
cuibono is offline cuibono  United States
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Success!

Square wave is square - I'll post pics later (its too hacked apart right now).

Thank to Segran for the winning tip - the LME supply bypass caps have to be connected to POWER ground, not SIGNAL ground as shown in AN-1850.

Very nice, thanks Segran.
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Old 6th August 2011, 02:20 PM   #134
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Any PCB to build this amplifier?
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Old 6th August 2011, 04:13 PM   #135
AndrewT is offline AndrewT  Scotland
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Panson was developing PCBs for that series of amps.
Ask.
Comparing LME49810, 49830 and 49811
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regards Andrew T.
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Old 7th August 2011, 12:52 AM   #136
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Hey nice thread Andrew!
Thank you so much!
IŽll take a look now and see if there is something that i like.
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