MBR1035, MBR1045
r(t), TRANSIENT THERMAL RESISTANCE
(NORMALIZED)
1.0
0.7
0.5
0.3
0.2
t
p
0.1
0.07
0.05
0.03
0.02
0.01
0.01
0.1
1.0
t, TIME (ms)
P
pk
t
1
P
pk
TIME
DUTY CYCLE, D = t
p
/t
1
PEAK POWER, P
pk
, is peak of an
equivalent square power pulse.
DT
JL
= P
pk
•
R
qJL
[D + (1 − D)
•
r(t
1
+ t
p
) + r(t
p
) − r(t
1
)] where:
DT
JL
= the increase in junction temperature above the lead temperature.
r(t) = normalized value of transient thermal resistance at time, t, i.e.:
r(t
1
+ t
p
) = normalized value of transient thermal resistance at time,
t
1
+ t
p
.
10
100
1000
Figure 9. Thermal Response
1500
1000
C, CAPACITANCE (pF)
700
500
MAXIMUM
300
TYPICAL
200
150
0.05 0.1
0.2
0.5
1.0
2.0
5.0
10
20
50
V
R
, REVERSE VOLTAGE (VOLTS)
Figure 10. Capacitance
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