DC/DC converter for providing function of noise countermeasures, control circuit thereof, control method thereof, and electronic apparatus including the DC/DC converter
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United States of America
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Mar 31, 2020
Grant Date -
Feb 28, 2019
app pub date -
Aug 23, 2018
filing date -
Aug 23, 2018
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A control circuit of a DC/DC converter includes: a driver turning on a switching transistor and turning off a rectifying transistor in on state, turning off the switching transistor and turning on the rectifying transistor in off state, and turning off the switching transistor and turning off the rectifying transistor in high impedance state; and a switching controller controlling the on state, the off state and the high impedance state, wherein the switching controller repeats a process including: transitioning to the off state when predetermined condition is satisfied in the on state; transitioning to the high impedance state with zero-cross of coil current flowing into an inductor as trigger in the off state; measuring variable time per cycle and transitioning to the off state with time-up as trigger; and transitioning to the on state when feedback voltage corresponding to output voltage of the DC/DC converter decreases to lower threshold voltage.
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