C&H Technology 240NQ045PbF - Manual (Page 5)

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4 Revision: 06-May-08
240NQ045PbF
Vishay High Power Products Schottky Rectifier, 240 A
Fig. 5 - Maximum Allowable Case Temperature vs.
Average Forward Current
Fig. 6 - Forward Power Loss Characteristics
Fig. 7 - Maximum Non-Repetitive Surge Current
Fig. 8 - Unclamped Inductive Test Circuit
Note
(1) Formula used: T
C
= T
J
- (Pd + Pd
REV
) x R
thJC
;
Pd = Forward power loss = I
F(AV)
x V
FM
at (I
F(AV)
/D) (see fig. 6);
Pd
REV
= Inverse power loss = V
R1
x I
R
(1 - D); I
R
at V
R1
= Rated V
R
Average Forward Current - I
F (AV)
(A)
Allowable Case Temperature (°C)
0 50 100 150 200 250 300
60
80
100
120
140
160
DC
Square wave (D=0.50)
80% rated Vr applied
see note (1)
Average Forward Current - I
F (AV)
(A)
Average Power Loss (Watts)
0 50 100 150 200 250 300 350
0
50
100
150
200
250
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
RMS limit
DC
Square Wave Pulse Duration - t
p
(microsec)
Non-Repetitive Surge Current - I
FSM
(A)
1000
10000
100000
10 100 1000 10000
At Any Rated Load Condition
And With Rated V Applied
Following Surge
RRM
Current
monitor
High-speed
switch
D.U.T.
R
g
= 25 Ω
+
Freewheel
diode
V
d
= 25 V
L
IRFP460
40HFL40S02