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d. Using the appropriate adjustment coefficients from figure 6 multiplied by the ĆTJ (total), determine the
correct amount of compensation to be applied to each of the forcing functions and voltage limits under
the actual test or system conditions. (see 6.8.2 for two examples of determining compensation)
6.8.2 Test limit compensation examples.
a. A device which has a power dissipation of 100 mW in case F is to be tested under a zero airflow condition.
on figure 5, ĆTJ between 500 linear ft/min and zero airflow is +4C. In order to adjust the various parameter
limits, use figure 6 which defines the limit adjustment coefficients for ĆTJ. To adjust VOH(max) at -55C, use
the +ĆTJ column of the -55C portion of figure 6 and locate the coefficient corresponding to VOH(max). This
value is 1.38 mV/C. Multiply the ĆTJ by the coefficient and algebraically add it to the -55C VOH(max) limit
from table III.
VOH(max) (adjusted limit) = (+4C) x (1.38 mV/C) + (-830 mV)
= 5.52 mV -830mV = -824.48 mV
Use 824 mV
Follow the same procedure to adjust the remaining parameters at -55C as well as all parameters at 25C and 125C.
b. A device with a power dissipation of 150 mW in case E is to be tested at an airflow of 200 linear ft/min and
the 25C testing is to be accomplished at an ambient temperature of +20C. On figure 4 ĆTJ due to airflow is
+2C. The ĆTJ due to ambient temperature change is -5C (25-20). Therefore the total ĆTJ = -5 +2 = -3C.
Using figure 6 find the 25C, -ĆTJ column. To adjust the VOL (max) locate the limit coefficient corresponding to
VOL (max) for a negative ĆTJ, this value is 0.44 mV/C. Multiply the ĆTJ by the coefficient and algebraically add
it to the +25C VOL (max) limit from table III.
VOL (max) (adjusted limit) = (-3C) x (0.44 mV/C) + (-1620 mV)
= 1.32 mV 1620 mV = -1621.32 mV
Use 1621 mV
Follow the same procedure to adjust the remaining parameters at +25C.
6.8.3 Maximum junction temperature. Under no circumstance should the devices be operated in an environment
such that TJ as calculated by the following equation be allowed to exceed the maximum junction temperature of 1.3. TJ
= TC +θJA (TYP) x PD (max). Typical junction to ambient thermal resistance θJA (TYP) varies as a function of air
velocity as shown on figure 7.
6.9 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect
to the previous issue due to the extensiveness of the changes.
Custodians:
Preparing activity:
Army - CR
DLA - CC
Navy - EC
Air Force - 11
(Project 5962-2068)
DLA - CC
Review activities:
Army - MI, SM
Navy - AS, CG, MC, SH, TD
Air Force - 03, 19, 99
NOTE: The activities listed above were interested in this document as of the date of this document. Since
organizations and responsibilities can change, you should verify the currency of the information above using
the ASSIST Online database at http://assist.daps.dla.mil .
39
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