4.11.1 The buck converter
Consider a more detailed schematic diagram of the buck (step-down) converter, as shown
in figure 4.17.
$i_s, I_s$
$Q_1$
$+ e_L$
$L$
$i_L$
$+$
$i_L, I_L$
$+$
$i_c, I_c$
$i_o, I_a$
$D_m$
$C$
$V_s$
Control
$V_c$
$C$
$V_o, V_a$
Load
Figure 4.17: A circuit diagram of a buck regulator