F5X -- the EUVL Approach - Page 28 - diyAudio
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Old 8th July 2011, 01:40 PM   #271
JBdV is offline JBdV  Netherlands
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@Patrick: the first GB was for how many F5X ??
what do we need for 1 F5X? what parts what quantity
how many more do we need to buy in order to get the required results?

If I could only look into the complete design package ....

Jan
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Old 8th July 2011, 03:08 PM   #272
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Me too......one set
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Old 8th July 2011, 03:13 PM   #273
Horio is offline Horio  United States
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Quote:
Originally Posted by JBdV View Post
@Patrick: the first GB was for how many F5X ??
what do we need for 1 F5X? what parts what quantity
how many more do we need to buy in order to get the required results?

If I could only look into the complete design package ....

Jan
Hey Jan,

Here is the original GB post from earlier in the year:

Regulator FET GB
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Old 10th July 2011, 03:09 PM   #274
EUVL is offline EUVL  Europe
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> @Patrick: the first GB was for how many F5X ??

22 pairs of 2SK3497, 22 pairs of 2SJ618.

> what do we need for 1 F5X?

If you use regulators as in the proto, you will need for 2 channels 1 pair of 2SK3497 and 1 pair of 2SJ618 (4 Mosfets in total).

> what parts what quantity

See above.

> how many more do we need to buy in order to get the required results?

I would suggest you allow for 10~20% matching reject if you are ordering less than 100 pairs.


Sorry for the late reply. Difficult times.
Patrick
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Old 11th July 2011, 09:42 AM   #275
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can we use irfp240/9240 Instead of 2SK3497 2SJ618 at regulators
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Old 11th July 2011, 09:45 AM   #276
AndrewT is offline AndrewT  Scotland
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compare transconductance at the operating current.
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regards Andrew T.
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Old 11th July 2011, 03:15 PM   #277
EUVL is offline EUVL  Europe
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You can use ANY complementary MOSFETs which have about the same Vgs at 4A.
The transconductance of these will determine the output impedance of the regulator.

The ones chosen have particularly high transconductances and positive tempco.
They are hence ideal for the purpose.


Patrick

.

Last edited by EUVL; 11th July 2011 at 03:40 PM.
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Old 11th July 2011, 10:10 PM   #278
EUVL is offline EUVL  Europe
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Andrew,

Please kindly check PM re regulator MOSFET GB.


Thx,
Patrick
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Old 11th July 2011, 10:31 PM   #279
JBdV is offline JBdV  Netherlands
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Thanks for the info Patrick
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Old 12th July 2011, 12:56 PM   #280
EUVL is offline EUVL  Europe
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To all regulator MOSFET GB subscribers,

Please kindly email MarkLai via DIYA, copy to me, to reconfirm your postal address.
We have the FETs all packed, ready to go.
And we want to be sure :

a) Our record for your postal address is correct.
b) You are expecting it and not away on holiday or something.


Many thanks,
Patrick
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