Control circuit for synchronous rectifier-type DC-DC...

Details Control circuit for synchronous rectifier-type DC-DC... Control circuit for synchronous rectifier-type DC-DC...

2007-11-09

2010-11-30

Sterrett, Jeffrey L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S283000, C323S285000

Reexamination Certificate

active

07843179

ABSTRACT:
To provide a control circuit for a synchronous rectifier-type DC-DC converter, a synchronous rectifier-type DC-DC converter and a control method thereof in which, in a light load state and a no-load state, an output voltage can be dropped to thus prevent an overshoot state from continuing. A synchronous rectifier-type DC-DC converter10and a control circuit20A thereof comprising a first switching element FET1that is made conductive when power is accumulated in an induction element L1, and a second switching element FET2that is made conductive when power accumulated in induction element L1is supplied to a load, also comprises a detecting unit COMP2that detects that a value of an output voltage VOUT of the synchronous rectifier-type DC-DC converter10A is a predetermined voltage value that is higher than a target voltage value, and control units COMP1and OR1that maintain the second switching element FET2in a conductive state after discharge of the power accumulated in the induction element L1is finished, based on the detection results of the detecting unit COMP2.

REFERENCES:
patent: 7019507 (2006-03-01), Dittmer et al.
patent: 7492135 (2009-02-01), Saeki et al.
patent: 7538526 (2009-05-01), Kojima et al.
patent: 7652945 (2010-01-01), Chu et al.
patent: 7667445 (2010-02-01), Hiasa
patent: 08-289535 (2006-11-01), None

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