two pole compensation for lme4702 lme49830 - diyAudio
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Old 2nd September 2013, 12:29 PM   #1
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Default two pole compensation for lme4702 lme49830

two pole compensation values estimated as
Cc1=18pf
Cc2=100pf
RC1=3.9Kohm
do you recommend these values as I have these in Polystyrene caps in stock.
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Old 2nd September 2013, 01:11 PM   #2
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here is the link for the schematic
Imageshack - u11d.jpg
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Old 2nd September 2013, 03:06 PM   #3
AndrewT is offline AndrewT  Scotland
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No pic.
Try attaching your schematic.
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regards Andrew T.
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Old 2nd September 2013, 06:19 PM   #4
alex mm is offline alex mm  Romania
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Old 2nd September 2013, 10:59 PM   #5
danny92 is offline danny92  Portugal
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Hi everyone,

I have two LM4702 ICs but I've never used them, because I wanted to make a good simulation, but the models from TINA don't gave me that opportunity, because I don't have current in the Vbe multiplier circuit. I wanted to make a 4 output devices amplifier with BUZ900/905. But without correct biasing I can't know if the circuit will be stable with the values of gate stopper resistors and for the CMiller cap. Now about this subject LM4702 can be used with compensation types like IMC, TPC or TMC?

Best regards,
Daniel Almeida
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Old 3rd September 2013, 01:14 AM   #6
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tried out it TINA TI and found no oscillations but I dont even see the freq extension to 414khz its just there as is...thought some connections might be wrong but they are rightly placed. I removed the compensation cap and it was still working exactly like before. I think compensation cap is not affecting in Tina Ti for 4702.

but are those values above makes stable amp?

Last edited by rhythmsandy; 3rd September 2013 at 01:36 AM.
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Old 3rd September 2013, 02:36 PM   #7
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any inputs on these values?
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Old 17th September 2013, 03:37 PM   #8
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Im thinking of 47pf and 150pf what do you say?
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Old 25th September 2013, 01:30 PM   #9
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guys any suggestions on the above value?
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Old 25th September 2013, 02:21 PM   #10
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R being 2.5k ohms Cp1 47pf and Cp2 150pf pole at 414khz
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