Circuit for starting up a synchronous step-up DC/DC...

Details Circuit for starting up a synchronous step-up DC/DC... Circuit for starting up a synchronous step-up DC/DC...

2007-04-10

2008-11-25

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S224000

Reexamination Certificate

active

07456622

ABSTRACT:
The low voltage circuit for starting up a synchronous step-up DC/DC converter, which connects to a voltage source through an inductor, includes a P-type power transistor, an N-type power transistor and a controller. The P-type power transistor includes a body diode, and one end of the P-type power transistor acts as a power source of an oscillator. The N-type power transistor connects the P-type power transistor in series, and both of the power transistors are not enabled at the same time. The oscillator electrically connects to the controller, which enables the P-type power transistor at initialization time, and enables the N-type power transistor a period after the initialization time.

REFERENCES:
patent: 5233508 (1993-08-01), Yamamura et al.
patent: 5808884 (1998-09-01), Teggatz et al.
patent: 6310466 (2001-10-01), Criscione
patent: 7084611 (2006-08-01), Kirchner et al.
patent: 7123494 (2006-10-01), Turchi
patent: 7330019 (2008-02-01), Bennett

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