Power supply circuit having a start up circuit

Details Power supply circuit having a start up circuit Power supply circuit having a start up circuit

2005-04-05

2005-04-05

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S268000, C323S284000

Reexamination Certificate

active

06876180

ABSTRACT:
A reference voltage circuit and an operational amplifier operate when an output voltage is produced from an output terminal of a power supply circuit. When the output voltage is low in the rising phase of a power source voltage, a transistor Q17in a startup circuit turns on and a transistor Q14turns off to surely turn on transistors Q11and Q12. Upon the output voltage exceeding a predetermined level, the transistor Q17turns off and an ordinary feedback control starts.

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