IXYS
Dual Diode Module Types MD#600-12N1 to MD#600-22N1
5.2 Calculating V F using ABCD Coefficients
The on-state characteristic I F vs. V F , on page 6 is represented in two ways;
(i) the well established V T0 and r T tangent used for rating purposes and
(ii) a set of constants A, B, C, D, forming the coefficients of the representative equation for V F in
terms of I F given below:
V F = A + B ? ln ( I F ) + C ? I F + D ? I F
The constants, derived by curve fitting software, are given below for both hot and cold characteristics.
The resulting values for V F agree with the true device characteristic over a current range, which is
limited to that plotted.
25°C Coefficients
150°C Coefficients
1.6116×10
1.84243×10
-7.48063×10
-2.353947×10
A
B
C
D
Data Sheet. MD#600-12N1 to 22N1 Issue 3
0.46164273
0.1048225
-4
-3
A
B
C
D
Page 4 of 9
0.435837127
0.06435749
-4
-3
November, 2004
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