Use getLoopTransfer to compute the open-loop response at the plant input and
superimpose the plant and feedback compensator responses.
clf
L = getLoopTransfer(ST,'Vin',-1);
C = getBlockValue(ST,'compensator');
bodeplot(L,psmodel(2),C(2),{1e-3/Tm pi/Tm})
Digital Control of Power Stage Voltage