Buck - Boost converter system parameters: Vg=48V input voltage, output voltage Vo=12V, output load R=1~100Ω, output fil

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Buck - Boost converter system parameters: Vg=48V
input voltage, output voltage Vo=12V, output
load R=1~100Ω, output filter inductance L=100μH, capacitance
C=220μF, switch frequency fsw=40kHz, namely switch
cycle Tsw=25μs. PWM modulator sawtooth amplitude
VM=2.5V. Feedback current network transfer
function Hi(s)=1 feedback partial voltage network
transfer function Hv(s)=0.5
Design the circuit With the help of the specific design
process of SISOTOOL (including the original open-loop gain of
inner and outer rings, the modified open-loop gain and
closed-loop gain)