N0392WC160
| Model | N0392WC160 |
| Description | Silicon Controlled Rectifier, 776A I(T)RMS, 1600V V(DRM), 1600V V(RRM), 1 Element, |
| PDF file | Total 10 pages (File size: 126K) |
| Chip Manufacturer | IXYS |
WESTCODE
Positive development in power electronics
7.2 Calculating V
T
using ABCD Coefficients
N0392WC120 to N0392WC160
The on-state characteristic I
T
vs. V
T
, 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
T
in
terms of I
T
given below:
V
T
=
A
+
B
⋅
ln
(
I
T
)
+
C
⋅
I
T
+
D
⋅
I
T
The constants, derived by curve fitting software, are given below for both hot and cold characteristics. The
resulting values for V
T
agree with the true device characteristic over a current range, which is limited to
that plotted.
25°C Coefficients
A
B
C
D
1.188757
-0.02229966
0.6326161 x 10
2.61 x 10
-3
-3
125°C Coefficients
A
B
C
D
0.8659468
0.01911387
1.032940 x 10
-0.0039777
-3
7.3 D.C. Thermal Impedance Calculation
−
t
1
−
e
τ
p
r
t
=
∑
r
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.
D.C. Double Side Cooled
Term
1
0.04957553
0.3426324
2
0.03279836
0.1005846
D.C. Single Side Cooled
Term
1
0.1353286
3.005903
2
0.0218089
1.062482
3
0.04523662
0.1346809
4
0.01295514
0.04304958
3
7.735708×10
0.04323793
-3
r
p
τ
p
r
p
τ
p
8.0 Reverse recovery ratings
(i) Q
ra
is based on 50% I
rm
chord as shown in Fig. 1.
(ii) Q
rr
is based on a 150µs integration time.
150
µ
s
i.e.
Q
rr
=
∫
i
0
rr
.
dt
(iii)
t
1
K Factor
=
t
2
Page 4 of 10
Fig. 1
November, 2001
Data Sheet. Types N0392WC120 to N0392WC160 Issue 1.
