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Data subject to change. Copyright © 2005-2012 Avago Technologies. All rights reserved.
AV01-0125EN - March 19, 2012
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=200mA) 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 includes the
e ects of the temperature rise in the device.
Derating curves are shown in Figures 1 and 2. Figure 1
speci es the maximum average output current allow-
able for a given ambient temperature. Figure 2 speci cs
the output power dissipation allowable for a given case
temperature. Above a case temperature 102C, the maxi-
mum 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 150C.
Turn On Time and Turn O Time Variation
The ASSR-322R 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 depicted in Fig-
ures 10 and 12. The changes of the turn on and turn o
time with ambient temperature are also shown in Figures
11 and 13.
