WESTCODE
An
Date:- 26
th
Sept 2007
Data Sheet Issue:- 2
IXYS
Company
Provisional Data
Rectifier Diode
Types W6908F#450 to W6908F#500
Absolute Maximum Ratings
VOLTAGE RATINGS
V
RRM
V
RSM
Repetitive peak reverse voltage, (note 1)
Non-repetitive peak reverse voltage, (note 1)
MAXIMUM
LIMITS
4500-5000
4600-5100
UNITS
V
V
OTHER RATINGS
I
F(AV)M
I
F(AV)M
I
F(AV)M
I
F(RMS)
I
F(d.c.)
I
FSM
I
FSM2
It
It
T
j op
T
stg
2
2
MAXIMUM
LIMITS
6908
4903
3122
12596
11424
70.0
77.0
24.50×10
29.65×10
6
6
UNITS
A
A
A
A
A
kA
kA
As
As
°C
°C
2
2
Maximum average forward current, T
sink
=55°C, (note 2)
Maximum average forward current. T
sink
=100°C, (note 2)
Maximum average forward current. T
sink
=100°C, (note 3)
Nominal RMS forward current, T
sink
=25°C, (note 2)
D.C. forward current, T
sink
=25°C, (note 4)
Peak non-repetitive surge t
p
=10ms, V
rm
=60%V
RRM
, (note 5)
Peak non-repetitive surge t
p
=10ms, V
rm
≤10V,
(note 5)
I t capacity for fusing t
p
=10ms, V
rm
=60%V
RRM
, (note 5)
I t capacity for fusing t
p
=10ms, V
rm
≤10V,
(note 5)
Operating temperature range
Storage temperature range
2
2
-40 to +160
-55 to +160
Notes:-
1)
De-rating factor of 0.13% per °C is applicable for T
j
below 25°C.
2)
Double side cooled, single phase; 50Hz, 180° half-sinewave.
3)
Cathode side cooled, single phase; 50Hz, 180° half-sinewave.
4)
Double side cooled.
5)
Half-sinewave, 160°C T
j
initial.
Provisional Data Sheet. Types W6908F#450 to W6908F#500 Issue 2
Page 1 of 9
Sept, 2007
WESTCODE
An IXYS Company
Characteristics
Rectifier Diode Types W6908F#450 to W6908F#500
PARAMETER
V
FM
V
FM
V
T0
r
T
I
RRM
Q
rr
Q
ra
I
rm
t
rr
R
thJK
F
W
t
Maximum peak forward voltage
Maximum peak forward voltage
Threshold voltage
Slope resistance
Peak reverse current
Recovered charge
Recovered charge, 50% Chord
Reverse recovery current
Reverse recovery time, 50% chord
Thermal resistance, junction to heatsink
Mounting force
Weight
MIN.
-
-
-
-
-
-
-
-
-
-
-
-
81
-
-
TYP.
-
-
-
-
-
-
20000
13500
390
70
-
-
-
2.0
2.8
MAX. TEST CONDITIONS
(Note 1)
1.15
1.48
0.767
0.092
20
200
22000
-
-
-
0.0065 Double side cooled
0.0130 Single side cooled
99
-
-
Note 2
Outline option FD
Outline options FC
I
TM
=1000A, t
p
=2000µs, di/dt=10A/µs,
V
r
=100V
Rated V
RRM
, T
j
=25°C
Rated V
RRM
I
FM
=4000A
I
FM
=8000A
UNITS
V
V
V
mΩ
mA
µC
µC
A
µs
K/W
K/W
kN
kg
Notes:-
1)
Unless otherwise indicated T
j
=160
°
C.
2)
For other clamp forces, please consult factory.
Provisional Data Sheet. Types W6908F#450 to W6908F#500 Issue 2
Page 2 of 9
Sept, 2007
WESTCODE
An IXYS Company
Notes on Ratings and Characteristics
1.0 Voltage Grade Table
Voltage Grade
45
46
48
50
2.0 Extension of Voltage Grades
V
RRM
V
4500
4600
4800
5000
Rectifier Diode Types W6908F#450 to W6908F#500
V
RSM
V
4600
4700
4900
5100
V
R
DC V
2100
2120
2160
2200
This report is applicable to other voltage grades when supply has been agreed by Sales/Production.
3.0 De-rating Factor
A blocking voltage de-rating factor of 0.13%/°C is applicable to this device for T
j
below 25°C.
4.0 Snubber Components
When selecting snubber components, care must be taken not to use excessively large values of snubber
capacitor or excessively small values of snubber resistor. Such excessive component values may lead to
device damage due to the large resultant values of snubber discharge current. If required, please consult
the factory for assistance.
5.0 Computer Modelling Parameters
5.1 Device Dissipation Calculations
I
AV
−
V
T
0
+
V
T
0
+
4
⋅
ff
⋅
r
T
⋅
W
AV
=
2
⋅
ff
2
⋅
r
T
2
2
W
AV
=
and:
∆
T
R
th
∆
T
=
T
j
max
−
T
K
Where V
T0
=0.767V, r
T
=0.092mΩ
R
th
= Supplementary thermal impedance, see table below and
ff
= Form factor, see table below.
Supplementary Thermal Impedance
Conduction Angle
Square wave Double Side Cooled
Square wave Cathode Side Cooled
Sine wave Double Side Cooled
Sine wave Cathode Side Cooled
6 phase (60°)
0.00707
0.01359
0.00697
0.01348
3 phase (120°)
0.00689
0.01349
0.00678
0.01328
½ wave (180°)
0.00673
0.01323
0.00654
0.01303
d.c.
0.0065
0.0130
Form Factors
Conduction Angle
Square wave
Sine wave
6 phase (60°)
2.449
2.778
3 phase (120°)
1.732
1.879
½ wave (180°)
1.414
1.57
d.c.
1
Provisional Data Sheet. Types W6908F#450 to W6908F#500 Issue 2
Page 3 of 9
Sept, 2007
WESTCODE
An IXYS Company
5.2 Calculating V
F
using ABCD Coefficients
Rectifier Diode Types W6908F#450 to W6908F#500
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
A
B
C
D
0.7502846
0.01006258
2.259358×10
3.907947×10
-5
-3
160°C Coefficients
A
B
C
D
0.4591932
0.02387826
4.533276×10
4.924113×10
-5
-3
Provisional Data Sheet. Types W6908F#450 to W6908F#500 Issue 2
Page 4 of 9
Sept, 2007
WESTCODE
An IXYS Company
5.3 D.C. Thermal Impedance Calculation
Rectifier Diode Types W6908F#450 to W6908F#500
−
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. Double Side Cooled
Term
1
3.424745×10
1.125391
-3
2
1.745273×10
0.1878348
-3
3
8.532017×10
0.02788979
-4
4
3.457329×10
8.430889×10
-4
-3
r
p
τ
p
D.C. Single Side Cooled
Term
1
8.375269×10
8.929845
-3
2
2.518437×10
0.4711304
-3
3
1.193758×10
0.08221244
-3
4
7.45432×10
-4
r
p
τ
p
0.01221961
6.0 Reverse recovery ratings
(i) Q
ra
is based on 50% I
rm
chord as shown in Fig. 1
Fig. 1
(ii) Q
rr
is based on a 150µs integration time i.e.
150
µ
s
Q
rr
=
(iii)
∫
i
0
rr
.
dt
K Factor
=
t
1
t
2
Provisional Data Sheet. Types W6908F#450 to W6908F#500 Issue 2
Page 5 of 9
Sept, 2007
