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Control circuit of step-down DC-DC converter, control circuit of step-up DC-DC converter and step-up/step-down DC-DC converter
Control circuit of step-down DC-DC converter, control circuit of step-up DC-DC converter and step-up/step-down DC-DC converter
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机译:降压DC-DC转换器的控制电路,升压DC-DC转换器的控制电路以及升压/降压DC-DC转换器
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摘要
A DC-DC converter or the like capable of generating a stable output voltage is provided. A control circuit 11 of a current mode step-down DC-DC converter 1 includes a slope compensation circuit SC and an offset circuit IF1. The slope compensation circuit SC adds an increase gradient m2 due to slope compensation to an increase gradient of a coil current waveform Vsense in a range wherein an ON period Ton of a switch SW1 exceeds ½ of an operating cycle T. An offset circuit IF1 applies an offset voltage Voffset which becomes smaller depending on the ON period Ton in excess of ½ of an operating cycle T, to a coil current waveform Vsense.
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