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Old 21st April 2010, 05:09 PM   #1
sasmit is offline sasmit  India
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Default 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 ?
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Old 21st April 2010, 05:20 PM   #2
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Yes, C6 is a Miller cap. There does not need to be another one.
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Old 21st April 2010, 05:44 PM   #3
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Quote:
Originally Posted by sasmit View Post
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 ?
Click the image to open in full size.
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
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Old 21st April 2010, 07:23 PM   #4
sasmit is offline sasmit  India
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Quote:
Originally Posted by Sebastiaan View Post
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 ?
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Old 21st April 2010, 07:25 PM   #5
sasmit is offline sasmit  India
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Quote:
Originally Posted by pacificblue View Post
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 ?
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Old 21st April 2010, 08:41 PM   #6
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Originally Posted by sasmit View Post
Is this there in the datasheet for LME 49811 or an appnote ?
See here

With kind regards,
Bas
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Old 21st April 2010, 08:41 PM   #7
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Exactly. It is also a Miller cap and it is for another stage.
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Old 22nd April 2010, 06:22 AM   #8
sasmit is offline sasmit  India
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Quote:
Originally Posted by Sebastiaan View Post
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
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Old 22nd April 2010, 06:25 AM   #9
sasmit is offline sasmit  India
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Quote:
Originally Posted by pacificblue View Post
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 ?
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Old 22nd April 2010, 07:31 PM   #10
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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.
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