Title:
POWER SUPPLY CONTROL DEVICE AND SWITCHING POWER SUPPLY
Document Type and Number:
WIPO Patent Application WO/2023/090029
Kind Code:
A1
Abstract:
A power supply control device 10 comprises: an upper side gate driver 121 for turning on/off an upper side transistor N1 of N-channel type connected between an end to which an input voltage Vin is applied and an end to which a switch voltage Vsw is applied; a bootstrap circuit 13 for generating a bootstrap voltage Vbst that is higher by the charged voltage of a bootstrap capacitor than the switch voltage Vsw and supplying the bootstrap voltage Vbst to the upper side gate driver 121; and a controller 14 for switching the switching power supply to either a heavy load mode or a light load mode. The bootstrap circuit 13 can switch the capacitance value of the bootstrap capacitor in accordance with the on/off of the upper side transistor N1. The controller 14 performs control so that the bootstrap circuit 13 performs the capacitance value switching control of the bootstrap capacitor in the heavy load mode and stops the capacitance value switching control of the bootstrap capacitor in the light load mode.
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Inventors:
MURAKAMI KAZUHIRO (JP)
Application Number:
PCT/JP2022/038732
Publication Date:
May 25, 2023
Filing Date:
October 18, 2022
Export Citation:
Assignee:
ROHM CO LTD (JP)
International Classes:
H02M1/08; H02M3/155
Foreign References:
| JPH0677806A | 1994-03-18 | |||
| JP2018057100A | 2018-04-05 | |||
| JP2016058953A | 2016-04-21 | |||
| JP2005304226A | 2005-10-27 |
Attorney, Agent or Firm:
SANO PATENT OFFICE (JP)
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