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Calculate max power dissipation with and without heat sink.

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Calculate max. power dissipation and with and without heatsink.

θjc = 1.75° c/w , θcs = 1° c/w , θca = 50° c/w

θsa = 5° c/w , tjmax = 150°c and tamb = 30°

When no heat sink is used, the max device power dissipation is found as,

P D max = TJMAX=TAMBθdevCase+θCaseamb

= 150301.75+50 = 2.32 w

When a heat sink is used, the max device power dissipation is found as,

P DMAX = TJMAXTAMBθdevCase+θCaseSink+θSinkamb

= 150301.75+1+5 = 15.5 w

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