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參數(shù)資料
| 型號： | R1279NS25L |
| 廠商： | WESTCODE SEMICONDUCTORS LTD |
| 元件分類： | 晶閘管 |
| 英文描述： | 2571 A, 2500 V, SCR |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 688K |
| 代理商： | R1279NS25L |
WESTCODE
WESTCODE An IXYS Company
Distributed Gate Thyristor Types R1279NS22# to R1279NS25#
Data Sheet. Type R1279NS22# to R1279NS25# Issue 1
Page 6 of 12
January, 2003
16.0 Computer Modelling Parameters
16.1 Calculating VT using ABCD Coefficients
The on-state characteristic IT vs VT, on page 7 is represented in two ways;
(i)
the well established V0 and rs tangent used for rating purposes and
(ii)
a set of constants A, B, C, D, forming the coefficients of the representative equation for VT in
terms of IT given below:
()
T
I
D
I
C
I
B
A
V
+
+
+
=
ln
The constants, derived by curve fitting software, are given in this report for hot and cold characteristics
where possible. The resulting values for VT agree with the true device characteristic over a current range,
which is limited to that plotted.
25°C Coefficients
125°C Coefficients
A
0.6194115
1.448949
B
0.1996517
4.04153×10
-4
C
3.2676 ×10
-4
3.35803×10
-4
D
-0.0131095
-5.4269×10
-4
16.2 D.C. Thermal Impedance Calculation
∑
=
=
n
p
t
p
t
p
e
r
1
τ
Where p = 1 to n, n is the number of terms in the series.
t = Duration of heating pulse in seconds.
rt = Thermal resistance at time t.
rp = Amplitude of pth term.
τp = Time Constant of rth term.
D.C. Single Side Cooled
Term
1234
rp
0.0130425
6.2957×10
-3
2.35655×10
-3
2.23408×10
-3
τp
1.53109
0.165647
0.0207267
3.4714×10
-3
D.C. Double Side Cooled
Term
1
2
3
4
rp
0.03517957
5.171738×10
-3
5.107098×10
-3
3.198402×10
-3
τp
6.431644
0.5234892
0.08301891
5.032106×10
-3
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