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参数资料
| 型号： | R0878LS20L |
| 厂商： | WESTCODE SEMICONDUCTORS LTD |
| 元件分类： | 晶闸管 |
| 英文描述： | 1765 A, 2000 V, ASSYMETRIC SCR |
| 文件页数： | 9/12页 |
| 文件大小： | 347K |
| 代理商： | R0878LS20L |
WESTCODE Positive development in power electronics
R0878LS16x to R0878LS21x
Data Sheet. Types R0878LS16x to R0878LS21x Issue 1
Page 6 of 12
June, 2001
14.0 Computer Modelling Parameters
14.1 Calculating VT using ABCD Coefficients
The on-state characteristic IT vs VT, on page 7 is represented in two ways;
(i)
the well established Vo 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.
125°C Coefficients
A
1.510816
B
-0.01749119
C
4.616469×10
-4
D
2.404072×10
-3
14.2 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. Double Side Cooled
Term
1
2
3
4
rp
0.01771901
4.240625×10
-3
6.963806×10
-3
3.043661×10
-3
τp
0.7085781
0.1435833
0.03615196
2.130842×10
-3
D.C. Single Side Cooled
Term
12
34
5
rp
0.03947164
0.01022837
8.789912×10
-3
4.235162×10
-3
1.907609×10
-3
τp
4.090062
1.078983
0.08530917
0.01128791
1.240861×10
-3
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