| 摘要 |
A current-mode control type DC-DC converter includes a switching transistor turned on with a clock signal output in predetermined cycles, an inductor supplied with electric current when the switching transistor is turned on, an error amplifier circuit to output an error voltage that is an amplified difference between a predetermined reference voltage and a divided output voltage of the DC-DC converter, a slope voltage generation circuit to generate a slope voltage by performing slope compensation on an inductor current, a PWN comparator to compare the slope voltage with the error voltage and generate a reset pulse to turn off the switching transistor when the slope voltage reaches the error voltage, and a slope voltage maintenance mechanism to keep the slope voltage at the ground voltage from when the reset pulse is generated to when a subsequent clock signal is generated.
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