Patent ID: 7119525
Filing Date: 2006-10-10
Classification: H02M,H03M

Abstract:
1. A control circuit of a DC—DC converter of a switching regulator system for generating an output voltage from an input voltage depending on a reference voltage, comprising: an arithmetic unit for outputting a differential signal of the output voltage and a feedback signal; an integrating unit including a differential voltage amplifier for inputting the reference voltage in a non-inverting input and inputting the differential signal in an inverting input, and a capacitor connected to an inverting input terminal of the differential voltage amplifier at one end and connected to an output terminal of the differential voltage amplifier at the other end, for outputting an integral signal by integrating the differential signal; a quantizing unit for outputting a 1-bit digital signal by quantizing the integral signal; a feedback unit for outputting the input signal voltage or a grounding voltage to the arithmetic unit as the feedback signal depending on the input 1-bit digital signal; and a PWM unit for determining an on-duty of a main switching element of the DC—DC converter depending on a pulse density of the quantizing unit.