Why do the currents balance if IGBTs with positive temperature coefficients are connected in parallel?

“Let’s consider the case where two IGBTs with different VCEsat are connected in parallel.
(1) A larger amount of the current will flow through the IGBT with smaller VCEsat.
(2) Due to the larger current flow, the total loss of the IGBT becomes large and the junction temperature increase.
(3) If the IGBT has a positive temperature coefficient, VCEsat increases with increasing junction temperature Tvj and hence, the current will decrease until current balance is achieved.”

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