Title:
SWITCHING POWER SUPPLY DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/090101
Kind Code:
A1
Abstract:
One embodiment of the present disclosure generates an output voltage VOUT obtained by switching and dropping down an input voltage VIN by a high-side switch 2 and a low-side switch 3 which are N-channel MOSFETs. An LDO 9 charges a boost capacitor 11 to generate a drive power supply for driving the switches 2 and 3. An off-time generation unit 17 brings the gate voltage of the high-side switch 2 to a high level when a divided signal FB becomes lower than a target voltage VREF. A Ton calculation unit 12 has a current source circuit 21 in which the value of a constant current I is adjusted depending on the input voltage VIN and brings the gate voltage of the high-side switch 2 to a low level in accordance with the result of comparing the terminal voltage of a capacitor 22 charged with the constant current I with the voltage obtained by multiplying the output voltage by α. An RS latch 14 preferentially brings the gate voltage to the high level in a state in which the off-time generation unit 17 outputs a signal for bringing the gate voltage to the high level.
Inventors:
ASAHI TAKASHI (JP)
Application Number:
PCT/JP2023/034958
Publication Date:
May 02, 2024
Filing Date:
September 26, 2023
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
H02M3/155
Foreign References:
| JP2011199972A | 2011-10-06 | |||
| JP2022085364A | 2022-06-08 | |||
| JP2022085365A | 2022-06-08 |
Attorney, Agent or Firm:
SATO INTERNATIONAL PATENT FIRM (JP)
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