C&H Technology 111CNQ045A - Manual (Page 5)

111CNQ045A
Bulletin PD-20.758 rev. A 03/02
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (Per Leg)
Fig. 8 - Unclamped Inductive Test Circuit
Fig. 6 - Forward Power Loss Characteristics
(Per Leg)
(2) Formula used: T
C
= T
J
- (Pd + Pd
REV
) x R
thJC
;
Pd = Forward Power Loss = I
F(AV)
x V
FM
@ (I
F(AV)
/ D) (see Fig. 6);
Pd
REV
= Inverse Power Loss = V
R1
x I
R
(1 - D); I
R
@ V
R1
= 80% rated V
R
FREE-WHEEL
DIODE
40HFL40S02
CURRENT
MONITOR
HIGH-SPEED
SWITCH
IRFP460
L
DUT
Rg = 25 ohm Vd = 25 Volt
+
Allowable Case Temperature (°C)
Average Forward Current - I
F(AV)
(A)
Average Power Loss (Watts)
Average Forward Current - I
F(AV)
(A)
Non-Repetitive Surge Current - I
FSM
(A)
Square Wave Pulse Duration - t
p
(microsec)
Fig. 7 - Max. Non-Repetitive Surge Current (Per Leg)
130
140
150
160
170
180
0 10 20 30 40 50 60 70 80 90
DC
see note (2)
Square wave (D = 0.50)
80% Rated Vr applied
0
10
20
30
40
50
0 10 20 30 40 50 60 70 80
DC RMS Limit
D = 0.75
D = 0.50
D = 0.33
D = 0.25
D = 0.20
100
1000
10000
10 100 1000 10000
At Any Rated Load Condition
And With Rated Vrrm Applied
Following Surge
Document Number: 93201 www.vishay.com
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