miller cap

sasmit · 21st April 2010, 04:09 PM

do we need a miller cap on LME 49810 based designs ?
Can someone point out to me the miller cap on Rod Elliotts P3A, I think it's C6 but then shouldn't there be a simmilar one on the other side also ?

pacificblue · 21st April 2010, 04:20 PM

Yes, C6 is a Miller cap. There does not need to be another one.

Sebastiaan · 21st April 2010, 04:44 PM

Quote:

Originally Posted by sasmit

do we need a miller cap on LME 49810 based designs ?
Can someone point out to me the miller cap on Rod Elliotts P3A, I think it's C6 but then shouldn't there be a simmilar one on the other side also ?

Dear,

In the LME49810 the cap between the biasM and Comp pin is the Miller cap. There is an additional circuit with with 3.3K and 75pF from comp to ground which I really recommended for the LME49810 as well (it was intended for the LME49811).

With kind regards,
Bas

sasmit · 21st April 2010, 06:23 PM

Quote:

Originally Posted by Sebastiaan

Dear,

In the LME49810 the cap between the biasM and Comp pin is the Miller cap. There is an additional circuit with with 3.3K and 75pF from comp to ground which I really recommended for the LME49810 as well (it was intended for the LME49811).

With kind regards,
Bas

Is this there in the datasheet for LME 49811 or an appnote ?

sasmit · 21st April 2010, 06:25 PM

Quote:

Originally Posted by pacificblue

Yes, C6 is a Miller cap. There does not need to be another one.

I couldn't help it C4 looks very simmilar in usage ..but it's placed one stage behind ?

Sebastiaan · 21st April 2010, 07:41 PM

Quote:

Originally Posted by sasmit

Is this there in the datasheet for LME 49811 or an appnote ?

See here

With kind regards,
Bas

pacificblue · 21st April 2010, 07:41 PM

Exactly. It is also a Miller cap and it is for another stage.

sasmit · 22nd April 2010, 05:22 AM

Quote:

Originally Posted by Sebastiaan

See here

With kind regards,
Bas

thanks a lot, I have incorporated these in my design now..I too remember about someone from national on the forum suggesting these changes

sasmit · 22nd April 2010, 05:25 AM

Quote:

Originally Posted by pacificblue

Exactly. It is also a Miller cap and it is for another stage.

please bear with me... If you look at rod elliott's design he has a miller cap from the output stage to the driver stage and another in the VAS( I guess C4 is in VAS right ? ). LME has only one in the Vas stage, have they left the other one i.e. in the output to driver stage upto the designer ?

pacificblue · 22nd April 2010, 06:31 PM

Yes, they left it to the designer, because they cannot know what output stage he chooses and if it needs a Miller cap or not.

21st April 2010, 04:09 PM	#1
sasmit diyAudio Member Join Date: May 2006	miller cap do we need a miller cap on LME 49810 based designs ? Can someone point out to me the miller cap on Rod Elliotts P3A, I think it's C6 but then shouldn't there be a simmilar one on the other side also ?

21st April 2010, 04:20 PM	#2
pacificblue diyAudio Member Join Date: May 2008	Yes, C6 is a Miller cap. There does not need to be another one. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

21st April 2010, 07:41 PM	#7
pacificblue diyAudio Member Join Date: May 2008	Exactly. It is also a Miller cap and it is for another stage. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

22nd April 2010, 06:31 PM	#10
pacificblue diyAudio Member Join Date: May 2008	Yes, they left it to the designer, because they cannot know what output stage he chooses and if it needs a Miller cap or not. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

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