Question

A power MOSFET in a DC-DC converter must sustain power loss of 30 W. The device is manufactured in a TO-220 package, with Ric-1.2K/W, and Trma,-150 ℃ The manufacturer reports that without a heat sink, the approximate value of Ria is 45 K/W a) Can the power loss value be handled without a heat sink? b) If not, assume Rcs 1.0 K/W and design a specification for Rsa to meet the maximum junction temperature requirement if ambient temperature is 25 °C. c) What is the maximum ambient temperature the device can survive at, i.e. Rsa is too low (less than 0.1 K/W) that no realistic heat sink is possible?

Answer 1

RC 3ου 11 86 Trvice Cannot handto 300 Ta anebink

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