Control circuit of DC/DC converter, power supply circuit, and electronic device
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United States of America Patent
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Sep 3, 2024
Grant Date -
Dec 8, 2022
app pub date -
Jun 6, 2022
filing date -
Jun 6, 2022
priority date (Note) -
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Abstract
A control circuit of a boost DC/DC converter including a high side transistor and a low side transistor, includes a pulse modulator including a first error amplifier that amplifies an error between a reference voltage and a feedback signal corresponding to an output voltage of the converter, the pulse modulator being configured to generate a pulse signal with a pulse modulated, a logic circuit that generates a high side control signal and a low side control signal, and a load switch drive circuit that drives a load switch that is a PMOS transistor connected between the high side transistor and a load. The load switch drive circuit can make a switch between a first mode for fully turning on the PMOS transistor and a second mode for supplying a drive voltage corresponding to the output signal of the first error amplifier to a gate of the PMOS transistor.
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