An oscillator 2 generates a pulse signal of a predeter mined cycle. A ramp signal generating circuit 3 generates a ramp signal Which is synchronous With the pulse signal
output from the oscillator 2. Here, the ramp signal is a signal including a time period during Which a voltage approxi mately linearly increases as time elapses. The ramp signal is used to stabiliZe the operations of the DC/DC converter. of the technique that utiliZes a ramp signal in order to stabiliZe the operations of a DC/DC converter are
disclosed, for example, by “On the Characteristics of DC-to DC Converters Operating in Current Programmed Mode”
Written by K. Harada, et al. (the Telecommunications Soci
ety Paper, April ’86, Vol.J69-C No. 4)