[volt-nuts] physical explanation of the tilt effect?
Andreas_-_Jahn at t-online.de
Sun Sep 19 18:56:17 UTC 2010
when having a look at the link from Alan to the chinese collegues:
the photograpy from the opened LTZ and the (mirrored) photo of the chip
you can see the following.
- Pin1 (heater at lower left) has 3 short bond wires:
should be the coolest place on the chip
especially for the LTZ1000A which is isolated from the case
- Pin 8,7 and 7 are on the corner lower right.
- so the lower half of the chip is cooled by 6 bond wires
against the upper half with 4 bond wires. (Pin 2-5)
I am not a chip designer but when looking at the photo
the buried zener seems to be the circular thing in the middle
surrounded by the transistors.
The both transistors seem to be splitted each into 4
90 degrees parts T1 and T2 interleaved by 45 degrees.
On the other side the inner heater circles seem not to be
bonded (not active ?)
with best regards
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