ELE 754 Midterm: ELE 754 Fall 2012 Midterm Solution
31 Jan 2019
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You can use one letter size (8. 5"xll" or equivalent) double sided formula sheets prepared by yourself: show details of derivation steps. Part of questions mayor may not be related: total 9 pages including cover page (this page) Student number: ______ __ _ section number: ______ __ Consider the buck converter with controller shown in figure 1. Vd =48v, switching frequency frw = 50khz, output voltage is maintained at vo =5v, and the duty cycle d is adjusted by the controller to keep the output voltage constant. The converter supplies a minimum 25w load at continuous current mode. Answer the following questions, assuming that the inductance is the minimum inductance found in 1. 1). 1. 2) find the minimum capacitance if the voltage ripple must not exceed 1 % of output voltage in continuous current mode. 3"l 6 v;:; r. bv () =- ~jl . (5 fpc. 1. 3) calculate the peak current in switch id,pk when the load is 50w.
