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參數(shù)資料
| 型號(hào)： | N3476TV400 |
| 廠商： | WESTCODE SEMICONDUCTORS LTD |
| 元件分類： | 晶閘管 |
| 英文描述： | 6787 A, 4000 V, SCR |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 211K |
| 代理商： | N3476TV400 |
WESTCODE
WESTCODE An IXYS Company
Phase Control Thyristor Types N3476T#360 to N3476T#420
Data Sheet. Types N3476T#360 to N3476T#420 Issue 1
Page 5 of 11
May, 2004
8.3 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 and:
t = Duration of heating pulse in seconds.
r
t
= Thermal resistance at time t.
rp = Amplitude of pth term.
τ
p = Time Constant of rth term.
The coefficients for this device are shown in the tables below:
D.C. Double Side Cooled
Term
123
rp
4.293445×10
-3
2.542182×10
-3
1.167986×10
-3
τ
p
0.8365194
0.176198
0.02000819
D.C. Single Side Cooled
Term
123
4
rp
9.899658×10
-3
2.731068×10
-3
2.619106×10
-3
1.049687×10
-3
τ
p
5.623142
1.132481
0.1461472
0.01849926
9.0 Reverse recovery ratings
(i) Qra is based on 50% Irm chord as shown in Fig. 1
Fig. 1
(ii) Qrr is based on a 150
s integration time i.e.
∫
=
s
rr
dt
i
Q
150
0
.
(iii)
2
1
t
Factor
K
=
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