Section 12
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Section 12.10 Power Transistors
12.64 A power MOSFET is specified to have IDmax = 5A, VDSmax = 50V, and PDmax = 50W.
(a) Sketch the SOA oundaries.
(b) If the MOSFET is used in the common-source configuration as shown in Fig. P12.64, show that the maximum current occurs when VDS = 0, the maximum VDS occurs when ID =0, and the maximum power dissipation ccurs When VDS = VDD/2.
(c) For VDD = 40 V, find the smallest resistance R for which the operating point is always within the SOA. What are the corresponding values of IDmax and PDmax? (d) Repeat (c) for VDD = 30 V. (e) Repeat (c) for VDD = 15 V.
