R1271NS12x Westcode Semiconductors, R1271NS12x Datasheet - Page 6

• Manufacturer Part Number: R1271NS12x
• Description: (R1271NS10x / R1271NS12x) Distributed Gate Thyristor
• Manufacturer: Westcode Semiconductors

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Term
Term
WESTCODE
14.0 Computer Modelling Parameters
The on-state characteristic I
(i)
(ii)
The constants, derived by curve fitting software, are given in this report for hot characteristics where
possible. The resulting values for V
is limited to that plotted.
Where p = 1 to n, n is the number of terms in the series.
Data Sheet. Types R1271NS10x to R1271NS12x Issue 1
r
r
p
p
p
p
14.1 Calculating V
14.2 D.C. Thermal Impedance Calculation
the well established V
a set of constants A, B, C, D, forming the coefficients of the representative equation for V
terms of I
0.02919832
t = Duration of heating pulse in seconds.
r
r
6.298105
0.01249139
t
p
p
0.8840810
Positive development in power electronics
= Thermal resistance at time t.
= Amplitude of p
= Time Constant of r
1
1
T
given below:
T
using ABCD Coefficients
4.863568×10
V
T
3.286174
T
vs. V
6.316833×10
th
0
2
and r
term.
0.1215195
A
th
T
, on page 7 is represented in two ways;
T
term.
2
s
agree with the true device characteristic over a current range, which
-3
tangent used for rating purposes and
r
C
D
B
A
B
t
D.C. Double Side Cooled
D.C. Single Side Cooled
3.744798×10
-3
0.5359179
125°C Coefficients
ln
p
p
n
1
3
I
Page 6 of 12
-1.30505×10
r
1.520747638
8.42314×10
2.47082×10
1.850855×10
T
p
0.03400152
-3
1
3
C
6.818034×10
e
0.1186897
-3
-4
-3
I
-3
T
p
t
4
D
1.922045×10
6.742908×10
-3
2.183558×10
4
0.02404574
I
T
R1271NS10x to R1271NS12x
5
-3
-3
-3
6.135330×10
1.326292×10
3.379476×10
1.848294×10
5
June, 2001
6
T
-4
-3
in
-3
-3