Patent ID: 7957165
Filing Date: 2011-06-07
Classification: H02M,Y10S

Abstract:
1. A DC-DC conversion circuit of which output is controlled by a first and a second control signals, comprising: a first and a second control signal generation circuits each of which corresponds to each of the first and second control signals, and each of which generates a corresponding control signal of the first and second control signals based on a corresponding output value of a first and a second output values; a first and a second soft-start control circuits each of which corresponds to each of the first and second control signals, and each of which controls a variation of the corresponding control signal of the first and second control signals at a start time of the DC-DC conversion circuit; and a start control circuit instructing the first soft-start control circuit to start operation in response to a start request of the DC-DC conversion circuit and instructing the second soft-start control circuit to start operation in accordance with a change of a control signal from the first control signal to the second control signal, the control signal taking part in an output control at the start time of the DC-DC conversion circuit, wherein: the first output value corresponds to an output voltage and the second output value corresponds to an output current; and the first control signal controls the output voltage to be constant and the second control signal controls the output current to be constant.