C&H Technology 300CNQ045PbF - Manual (Page 5)

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4 Revision: 28-Apr-08
300CNQ045PbF
Vishay High Power Products Schottky Rectifier, 300 A
Fig. 5 - Maximum Allowable Case Temperature vs.
Average Forward Current
Fig. 6 - Forward Power Loss Characteristics
Fig. 7 - Maximum Non-Repetitive Surge Current (Per Leg)
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
= 80 % rated V
R
I
F(AV)
- Average Forward Current (A)
Allowable Case Temperature (°C)
0 50 100 150 200 250
60
80
100
120
140
160
DC
Square wave (D = 0.50)
80 % rated V
R
applied
See note (1)
I
F(AV)
- Average Forward Current (A)
Average Power Loss (W)
0
20
40
60
80
100
120
140
DC
RMS limit
0 50 100 150 200 250
D = 0.75
D = 0.50
D = 0.33
D = 0.25
D = 0.20
t
p
- Square Wave Pulse Duration (µs)
I FSM
- Non-Repetitive Surge Current (A)
1000
10 000
100 000
At any rated load condition
and with rated V
RRM
applied
following surge
10 100 1000 10 000
Current
monitor
High-speed
switch
D.U.T.
R
g
= 25 Ω
+
Freewheel
diode
V
d
= 25 V
L
IRFP460
40HFL40S02