US 12,278,563 B2
Power supply circuit
Hisashi Sugie, Kyoto (JP)
Assigned to ROHM CO., LTD., Kyoto (JP)
Filed by ROHM CO., LTD., Kyoto (JP)
Filed on May 10, 2024, as Appl. No. 18/660,420.
Application 18/660,420 is a continuation of application No. 18/169,454, filed on Feb. 15, 2023, granted, now 12,015,339.
Claims priority of application No. 2022-024107 (JP), filed on Feb. 18, 2022.
Prior Publication US 2024/0291385 A1, Aug. 29, 2024
Int. Cl. H02M 3/07 (2006.01); G05F 1/46 (2006.01); G05F 1/565 (2006.01); G05F 1/575 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/07 (2013.01) [G05F 1/468 (2013.01); G05F 1/565 (2013.01); G05F 1/575 (2013.01); H02M 1/0045 (2021.05)] 5 Claims
OG exemplary drawing
 
1. A power supply circuit comprising:
an input terminal to be connected to receive an input voltage;
an output terminal;
a comparator having hysteresis structured to compare a monitoring voltage corresponding to an output voltage at the output terminal with an upper threshold and a lower threshold corresponding to a predetermined voltage and to generate an enable signal indicative of comparison result;
a first transistor having a source connected to the input terminal;
an error amplifier structured to amplify an error between a reference voltage and a feedback voltage corresponding to the output voltage at the output terminal, and having an output connected to a gate of the first transistor;
a flying capacitor;
a driver circuit structured to apply a switching voltage switching between a high voltage corresponding to the input voltage and a low voltage which is a ground voltage to one end of the flying capacitor;
a first rectifier element connected between another end of the flying capacitor and a drain of the first transistor;
a second rectifier element connected between the another end of the flying capacitor and the output terminal; and
a controller coupled to receive the enable signal from the comparator and structured to activate the driver circuit in an enable state, and to stop the driver circuit in a disable state.