MIL-M-38510/608
d. Using the appropriate adjustment coefficients from figure 6 multiplied by the sTJ (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, sTJ between 500 linear ft/min and zero airflow is +4°C. In order to adjust the various parameter limits, use figure 6 which defines the limit adjustment coefficients for sTJ. To adjust VOH(max) at -55°C, use the +sTJ column of the -55°C portion of figure 6 and locate the coefficient corresponding to VOH(max). This value is 1.38 mV/°C. Multiply the sTJ by the coefficient and algebraically add it to the -55°C VOH(max) limit from table III.
VOH(max) (adjusted limit) = (+4°C) 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 -55°C as well as all parameters at 25°C and 125°C. 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 25°C testing is to be accomplished at an ambient temperature of +20°C. On figure 4 sTJ due to airflow is
+2°C. The sTJ due to ambient temperature change is -5°C (25-20). Therefore the total sTJ = -5 +2 = -3°C. Using figure 6 find the 25°C, -sTJ column. To adjust the VOL (max) locate the limit coefficient corresponding to VOL (max) for a negative sTJ, this value is 0.44 mV/°C. Multiply the sTJ by the coefficient and algebraically add it to the +25°C VOL (max) limit from table III.
VOL (max) (adjusted limit) = (-3°C) 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 +25°C.
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 +eJA (TYP) x PD (max). Typical junction to ambient thermal resistance eJA (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 https://assist.daps.dla.mil .
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