A Schottky diode carrying current (If) of 10A with forward voltage drop (Vf) of 0.2V is used in a power converter. If the diode has junction to ambient thermal resistance Rth_ja = 40 deg.C/W and operating at ambient temperature Ta = 20 deg.C. Calculate the junction temperature (Tj) accounting only for conduction losses in degrees Celsius.... Select one:a. 80b. 120c. 140d. 100
Question
A Schottky diode carrying current (If) of 10A with forward voltage drop (Vf) of 0.2V is used in a power converter. If the diode has junction to ambient thermal resistance Rth_ja = 40 deg.C/W and operating at ambient temperature Ta = 20 deg.C. Calculate the junction temperature (Tj) accounting only for conduction losses in degrees Celsius.... Select one:a. 80b. 120c. 140d. 100
Solution
To calculate the junction temperature (Tj), we first need to calculate the power dissipation (Pd) in the diode. The power dissipation can be calculated using the formula:
Pd = If * Vf
Substituting the given values:
Pd = 10A * 0.2V = 2W
The junction temperature can then be calculated using the formula:
Tj = Ta + (Pd * Rth_ja)
Substituting the given values:
Tj = 20 deg.C + (2W * 40 deg.C/W) = 20 deg.C + 80 deg.C = 100 deg.C
So, the junction temperature (Tj) is 100 degrees Celsius. Therefore, the correct answer is d. 100.
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