W1608NC480
| Model | W1608NC480 |
| Description | DIODE 1608 A, 4800 V, SILICON, RECTIFIER DIODE, Rectifier Diode |
| PDF file | Total 7 pages (File size: 381K) |
| Chip Manufacturer | IXYS |
WESTCODE
An IXYS Company
5.2 Calculating V
F
using ABCD Coefficients
Rectifier Diode Type W1608NC400 to W1608NC500
The on-state characteristic I
F
vs. V
F
, on page 5 is represented in two ways;
(i)
the well established V
0
and r
s
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
A
B
C
D
1.663616
-0.1331571
2.296403×10
0.01520457
-4
160°C Coefficients
1.070367
-0.05305324
4.425432×10
9.572917×10
-4
-3
5.3 D.C. Thermal Impedance Calculation
−
t
τ
r
t
=
∑
r
p
⋅
1
−
e
p
p
=
1
p
=
n
Where
p = 1
to
n, n
is the number of terms in the series and:
t = Duration of heating pulse in seconds.
r
t
= Thermal resistance at time t.
r
p
= Amplitude of p
th
term.
τ
p
= Time Constant of r
th
term.
The coefficients for this device are shown in the tables below:
D.C. Single Side Cooled
Term
r
p
1
0.0291698
5.67822
2
4.295845×10
1.123602
-3
3
7.57109×10
0.1407857
-3
4
2.195801×10
-3
5
1.628753×10
1.272749×10
-3
-3
τ
p
0.014381914
D.C. Double Side Cooled
Term
r
p
1
0.01177146
0.9495346
2
6.485814×10
0.1337950
-3
3
2.471007×10
0.01636628
-3
4
1.607109×10
1.255571×10
-3
-3
τ
p
Data Sheet. Type W1608NC400 to W1608NC500 Issue 1
Page 4 of 7
September, 2003
