The current mode dc-dc converter is useful in
order to perform the superior dynamic characteristics.
However, these studies have focused on sensing the average
value of the switch/reactor current because it is very
difficult to sample the data of accurate peak point of
switch/reactor current in the digitally controlled high
switching converter. Therefore, it has been reported that the
peak point is estimated from the slope of reactor current,
but there has been no study that tried to detect the peak
value of reactor/switch current in the fast switching dc-dc
converter. This paper presents a new digital control circuit
which is able to detect not only the average output voltage
but also the peak switch current of the high frequency
switching dc-dc converter. In this proposed digital control
circuit, the peak current-injected control is realized using
the combination of the simple dual pulse width modulation
analog-to-digital signal converter and the programmed
delay circuit. In 100kHz digitally controlled dc-dc converter,
it is seen in simulation that the proposed method has no
overshoot of the output voltage and the convergence time
that the output voltage is settled to steady-state is only 30Ps.
The difference between the transient time of the proposed
circuit and that of the conventional method is an order of