12
300
200
100
V
= 300 V
= 6 A
= 10 V
= 25°C
DD
Q
T
I
V
T
D
GS
10
8
J
V
GS
Q
Q
2
t
1
10
d(off)
6
4
t
t
f
r
100
0
t
d(on)
I
T
= 6 A
= 25°C
D
J
2
0
Q
V
3
DS
1
1
10
100
0
6
12
18
24
30
36
Q , TOTAL CHARGE (nC)
R
, GATE RESISTANCE (OHMS)
T
G
Figure 8. Gate–To–Source and Drain–To–Source
Voltage versus Total Charge
Figure 9. Resistive Switching Time
Variation versus Gate Resistance
DRAIN–TO–SOURCE DIODE CHARACTERISTICS
6
V
= 0 V
GS
= 25
T
°C
J
5
4
3
2
1
0
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
V
, SOURCE–TO–DRAIN VOLTAGE (VOLTS)
SD
Figure 10. Diode Forward Voltage versus Current
SAFE OPERATING AREA
The Forward Biased Safe Operating Area curves define
the maximum simultaneous drain–to–source voltage and
drain current that a transistor can handle safely when it is for-
ward biased. Curves are based upon maximum peak junc-
able operation, the stored energy from circuit inductance dis-
sipated in the transistor while in avalanche must be less than
the rated limit and adjusted for operating conditions differing
from those specified. Although industry practice is to rate in
terms of energy, avalanche energy capability is not a con-
stant. The energy rating decreases non–linearly with an in-
crease of peak current in avalanche and peak junction
temperature.
tion temperature and a case temperature (T ) of 25°C. Peak
C
repetitive pulsed power limits are determined by using the
thermal response data in conjunction with the procedures
discussed in AN569, “Transient Thermal Resistance–Gener-
al Data and Its Use.”
Although many E–FETs can withstand the stress of drain–
to–source avalanche at currents up to rated pulsed current
Switching between the off–state and the on–state may tra-
verse any load line provided neither rated peak current (I
)
DM
) is exceeded and the transition time
(I
), the energy rating is specified at rated continuous cur-
DM
nor rated voltage (V
DSS
rent (I ), in accordance with industry custom. The energy rat-
D
(t ,t ) do not exceed 10 µs. In addition the total power aver-
r f
ing must be derated for temperature as shown in the
accompanying graph (Figure 12). Maximum energy at cur-
aged over a complete switching cycle must not exceed
(T
– T )/(R ).
J(MAX)
C
θJC
rents below rated continuous I can safely be assumed to
A Power MOSFET designated E–FET can be safely used
D
in switching circuits with unclamped inductive loads. For reli-
Motorola TMOS Power MOSFET Transistor Device Data
equal the values indicated.
5