Current mode DC/DC regulator having function for detecting input and output of current and voltage

A current mode DC/DC regulator having function for detecting input end output of current and voltage provided with a current mode control circuit, serving as a feedback circuit for stabilizing an output voltage supplied to a load, which detects a coil current flowing through a choke coil and controls switching operation of a switching element according to a result of comparison between a detection signal of the coil current and an error signal of an output voltage, serving as a reference signal,

• wherein a feed forward circuit is provided which detects a variation in a load current flowing through said load and adds the variation to the detection signal of said coil current, wherein said feed forward circuit is provided with;
• a first current detector for detecting directly a variation in the load current,
• a first current/voltage converter for converting a detection current from the first current detector to a voltage, and
• an adder for adding a voltage of a variation detection signal supplied from said first current/voltage converter to a voltage of a detection signal of said coil current and further said current mode control circuit is provided with;
• an error amplifier for generating an error signal of said output voltage by comparing a voltage detection signal yielded by dividing the output voltage with a reference signal,
• a second current detector for detecting said coil current, a second current/voltage converter for converting a detection current from the second current detector to a voltage to feed a detection signal of said coil current to said adder,
• a comparator for feeding a reset pulse when a voltage added by said adder exceeds a voltage of said error signal, and
• flip-flop circuit for turning on said switching element by a set pulse output from an oscillator and turning off said switching element by reset pulse from said comparator.