Pop quiz: Ace our eGaN FET quiz, win a textbook by the eGaN uber guru

Question one:

Consider the buck converter circuit below, the switch-node waveform, and eGaN and conventional MOSFET body diode operating curves provided here. In the buck converter, assume V_IN = 12 V, V_OUT = 1.2 V, I_OUT = 20 A, and f_SW = 200 kHz. T_d(on) = T_d(off) = 20 ns.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Calculate both the MOSFET and eGaN FET body diode power loss. They are both operating at room temperature (25 C).

A. MOSFET: 0.32 W   eGaN FET: 0.112 W

B. MOSFET: 0.112 W   eGaN FET: 0.32 W

C. MOSFET: 0.14 W   eGaN FET: 0.4 W

D. MOSFET: 0.08 W   eGaN FET: 0.48 W

E. MOSFET: 0.224 W   eGaN FET: 0.16 W