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HI.

As shown in the figure below, I would like to know how the 30A current is calculated for the IAUC120N06S5N017 at T a=85 °C, VGS=10 V,RthJA on 2s2p2,4)? Thank you.

Solved! Go to Solution.

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Hi,

Usually for practical considerations we take Tj to be 150C.

Hence recalculating Id for this Tj comes to be around 32A which can be approximated to 30A.

Regards,

Abhilash P

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Hi,

Thank you for posting on the Infineon community.

The Id = 30A at Ta = 85C is calculated as below,

**Step 1: Calculate Ptot at Ta = 85C**

Ptot = (Tj - Ta ) / Rthja

= (448.15 - 358.15)/23.3

= 3.862W

(Here Tj is 175C and Ta is 85C which is converted to Kelvin scale since Rthja is in K/W)

**Step2: From Ptot we calculate Id**

Ptot = Id^2 * Rdson

Id = sqrt ( (Ptot / Rdson) )

= sqrt (( 3.86 / 2.5m))

= 39A

= approximately equal to **30A** ( this is verified by practical measurements )

Regards,

Abhilash P

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HI. Abhilash_P .

According to your reply, the final result is 39A is approximately equal to 30A, the error of this approximation is a bit too large, right?The RDS of MOS tube is compensated according to 2.5mΩ, according to the curve of Figure 8 Typ. drain-source on-state resistance in the manual. The TJ used for the calculation is calculated according to the 175 ℃? Or according to 150 ℃ or other allowances with a certain margin? If TJ needs to leave a margin, what is the approximate margin?

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Hi,

Usually for practical considerations we take Tj to be 150C.

Hence recalculating Id for this Tj comes to be around 32A which can be approximated to 30A.

Regards,

Abhilash P

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Thank you for your reply.Abhilash P.