US 11,990,878 B2
Power supply circuit
Tomokazu Kojima, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/422,921
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Feb. 21, 2019, PCT No. PCT/JP2019/006622
§ 371(c)(1), (2) Date Jul. 14, 2021,
PCT Pub. No. WO2020/170394, PCT Pub. Date Aug. 27, 2020.
Prior Publication US 2022/0094316 A1, Mar. 24, 2022
Int. Cl. H03F 3/45 (2006.01); G05F 1/46 (2006.01)
CPC H03F 3/45183 (2013.01) [G05F 1/461 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power supply circuit comprising:
a differential amplifying unit including a first input transistor and a second input transistor forming a differential pair, and a first tail current source and a second tail current source;
an output stage including a first output transistor and a second output transistor that can be driven by an output of the differential amplifying unit; and
a controller to perform control such that during startup, a load is driven by the first tail current source and the first output transistor, and such that after startup, the load is driven by the first tail current source, the second tail current source, the first output transistor, and the second output transistor.