Datasheet

FDB8445 N-Channel PowerTrench
®
MOSFET
FDB8445 Rev A1 (W)
www.fairchildsemi.com4
Typical Characteristics
Figure 1. Normalized Power Dissipation vs Case
Temperature
0 25 50 75 100 125 150 175
0.0
0.2
0.4
0.6
0.8
1.0
1.2
POWER DISSIPATION MULIPLIER
T
C
, CASE TEMPERATURE(
o
C)
Figure 2.
25 50 75 100 125 150 175
0
20
40
60
80
100
V
GS
= 10V
CURRENT LIMITED
BY WIRE
I
D
, DRAIN CURRENT (A)
T
C
, CASE TEMPERATURE(
o
C)
Maximum Continuous Drain Current vs
Case Temperature
Figure 3.
10
-5
10
-4
10
-3
10
-2
10
-1
10
0
10
1
0.01
0.1
1
SINGLE PULSE
D = 0.50
0.20
0.10
0.05
0.02
0.01
NORMALIZED THERMAL
IMPEDANCE, Z
θJC
t, RECTANGULAR PULSE DURATION(s)
DUTY CYCLE - DESCENDING ORDER
2
NOTES:
DUTY FACTOR: D = t
1
/t
2
PEAK T
J
= P
DM
x Z
θJC
x R
θJC
+ T
C
P
DM
t
1
t
2
Normalized Maximum Transient Thermal Impedance
Figure 4. Peak Current Capability
10
-5
10
-4
10
-3
10
-2
10
-1
10
0
10
1
10
100
1000
V
GS
= 10V
SINGLE PULSE
I
DM
, PEAK CURRENT (A)
t, RECTANGULAR PULSE DURATION(s)
2000
T
C
= 25
o
C
I = I
25
175 - T
C
150
FOR TEMPERATURES
ABOVE 25
o
C DERATE PEAK
CURRENT AS FOLLOWS:
TRANSCONDUCTANCE
MAY LIMIT CURRENT
IN THIS REGION