11
Applications Information
On-Resistance and Derating Curves
The Output On-Resistance, R
(ON)
, speci ed in this data
sheet, is the resistance measured across the output
contact when a pulsed current signal (Io=0.6A) is ap-
plied to the output pins. The use of a pulsed signal (≤
30ms) implies that each junction temperature is equal
to the ambient and case temperatures. The steady-state
resistance, Rss, on the other hand, is the value of the
re sistance measured across the output contact when
a DC current signal is applied to the output pins for a
duration su cient to reach thermal equilibrium. Rss in-
cludes the e ects of the temperature rise in the device.
Derating curves are shown in Figures 1, 2, 3 and 4,
specifying the maximum output current allowable for
a given ambient temperature. The maximum allowable
output current and power dissipation are related by the
expression Rss=Po(max)/(Io(max))
2
from which Rss can
be calculated. Staying within the safe area assures that
the steady state MOSFET junction temperature remains
less than 125°C.
Turn On Time and Turn O Time Variation
The ASSR-14XX Series exhibits a very fast turn on and
turn o time. Both the turn on and turn o time can be
adjusted by choosing proper forward current as depict-
ed in Figures 11 and 13. The changes of the turn on and
turn o time with ambient temperature are also shown
in Figures 12 and 14.
Figure 1. Maximum Output Current Rating vs
Ambient Temperature (ASSR-1410-003E)
Figure 2. Maximum Output Current Rating vs
Ambient Temperature (ASSR-1411-001E)
I
O
- OUTPUT CURRENT - A
0
0.2
0.4
0.6
-40 -20 0 20 40 60 80 100
T
A
- TEMPERATURE -
o
C
Safe
Operating
Area
I
F
= 10mA, 4-Layer Board
I
O
- OUTPUT CURRENT - A
0
0.2
0.4
0.6
-40 -20 0 20 40 60 80 100
T
A
- TEMPERATURE -
o
C
Safe
Operating
Area
I
F
= 10mA, 4-Layer Board
0.9
0.95
1
1.05
1.1
-50 -25 0 25 50 75 100
T
A
- TEMPERATURE -
o
C
NORMALIZED OUTPUT WITHSTAND VOLTAGE
1.E-12
1.E-11
1.E-10
1.E-09
1.E-08
1.E-07
1.E-06
-50 -25 0 25 50 75 100
T
A
- TEMPERATURE -
o
C
I
OFF
- OUTPUT LEAKAGE CURRENT-A
Figure 5. Normalized Typical Output Withstand
Voltage vs. Temperature
Figure 6. Typical Output Leakage Current vs.
Temperature
Figure 3. Maximum Output Current Rating vs
Ambient Temperature (ASSR-1411-001E DC Con-
nection)
Figure 4. Maximum Output Current Rating vs
Ambient Temperature (ASSR-1420-002E)
I
O
- OUTPUT CURRENT - A
0
0.2
0.4
0.6
0.8
1
1.2
-40 -20 0 20 40 60 80 100
T
A
- TEMPERATURE -
o
C
I
F
= 10mA, 4-Layer Board
I
O
- OUTPUT CURRENT - A
0
0.2
0.4
0.6
-40 -20 0 20 40 60 80 100
T
A
- TEMPERATURE -
o
C
2-Channel
1-Channel
Safe
Operating
Area
I
F
= 10mA, 4-Layer Board