N1283CZ40JOO
| Model | N1283CZ40JOO |
| Description | Silicon Controlled Rectifier, |
| PDF file | Total 8 pages (File size: 74K) |
| Chip Manufacturer | LITTELFUSE |
WESTCODE
Positive development in power electronics
5.2 Calculating V
T
using ABCD coefficients
N1483xx36xxx to N1483xx42xxx
The on-state characteristic I
T
vs V
T
, on Fig. 9, is represented in two ways; (i) the well
established V
0
and r
S
tangent 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 in this report for both hot and cold
characteristics where possible. The resulting values for V
T
agree with the true device
characteristic over a current range, which is limited to that plotted.
125°C Coefficients
A
B
C
D
1.24×10
00
-1.25×10
-01
3.81×10
-05
1.87×10
-02
A
B
C
D
25°C Coefficients
1.17×10
00
-1.42×10
-02
1.25×10
-04
8.03×10
-04
5.3 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.
t =
Duration of heating pulse in seconds.
rt
= Thermal resistance at time
t.
r
p
= Amplitude of
pth
term.
τ
p
= Time Constant of
rth
term.
Term
rp
τ
p
D.C. Double Side Cooled
1
2
4.06E-03
2.91E-03
1.42E+00
2.92E-01
3
1.92E-03
3.16E-02
Term
rp
τ
p
D.C. Single Side Cooled
1
2
1.2E-02
5.10E-03
1.23E+01
2.88E-01
3
9.95E-04
8.57E-04
Types N1483xx36xxx to N1483xx42xxx Rating Report 99T04
page 4 of 8
December, 1999
