The feedback loop which controls the output voltage is obtained by using R
1
and R
2
to
“ sense ” the output voltage, and applying this sensed voltage to the inverting input of
the voltage error amplifi er. The non-inverting input is tied to a reference voltage, which
means the error amplifi er will constantly adjust its output voltage to force the voltages at
its inputs to be equal.
The feedback loop action continuously holds the regulated output at a fi xed value which
is a multiple of the reference voltage (as set by R
1
and R
2
), regardless of changes in load
current.
It is ...
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