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Joined: 8/22/2010(UTC) Posts: 38  Thanks: 14 times
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Hi:
What's the best way to utilize a set of measured transistors for QP1-12 in Legato 3.1? I measured Vgs on a small set of TP0604 (Fluke 287, -12V through 150R 5W resistors sourced from by a DP832A). The set is sorted by Vgs. I think of using (7,6,25,2,13,4) for QP1-QP6 and (12,18,23,10,24,1) for QP7-QP12. Is there a better way to use the measured parts for the build?
ID Vgs
17 2.2619
22 2.2684
8 2.2685
3 2.2693
5 2.2739
19 2.2769
15 2.2795
16 2.2798
7 2.2912
6 2.2927
25 2.2927
2 2.2938
13 2.294
4 2.2946
11 2.3075
14 2.3105
21 2.3168
20 2.3426
12 2.3602
18 2.3635
23 2.3637
10 2.3639
24 2.3661
1 2.3771
9 2.3839
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Rank: Member
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Joined: 6/17/2008(UTC) Posts: 921  Thanks: 1 times
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Look (more than) fine to me.
Remember - the original kit doesn't include hand selected FET's (not that I aware of, Brian may correct me).
And that unselected version is playing nicely right here, right now ;-)
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Rank: Administration
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Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
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Matching is actually not all that critical - but it may help a tiny bit. :) The reason is two fold - the FETs are in parallel - and it is a differential signal with no feedback.
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Rank: Member
Groups: Member
Joined: 8/22/2010(UTC) Posts: 38 Thanks: 14 times
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Thank you for the responses!
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