Synchronous rectifier circuits and method for utilizing...

Details Synchronous rectifier circuits and method for utilizing... Synchronous rectifier circuits and method for utilizing...

Filed on

2005-04-01

Date issued

2009-02-17

Examiner

Ullah, Akm E (Department: 2838)

Patent Class

Electricity: power supply or regulation systems

SubClass

Output level responsive

SubSubClass

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

Other Related Categories

C323S224000, C363S021060, C363S021140, C363S127000

Type

Reexamination Certificate

Status

active

Patent number

07492138

Description

ABSTRACT:
A method of improving the operation of a synchronous rectifier circuit which includes a switching transistor and synchronous transistor, by providing an operatively effective value of inductance in the current path of the synchronous transistor; which is shared by the control terminal circuit path of the transistor and by selecting a synchronous transistor having a low resistance to a control signal provided at the control terminal, as well as improved synchronous rectifier circuits designed according to the method. When the transistors are MOSFETs, the inductance provided is preferably a purely parasitic common source inductance in the range of about 2 nH to about 3 nH. The synchronous transistor exhibits a low value of gate resistance to facilitate fast energy exchange between the common source inductance and the gate-source capacitance.

REFERENCES:
patent: 6249156 (2001-06-01), Attwood
patent: 6541948 (2003-04-01), Wong
patent: 6577518 (2003-06-01), Abdoulin
patent: 7075276 (2006-07-01), Morales
patent: 2002/0175661 (2002-11-01), Wheeler et al.
patent: 2004/0109335 (2004-06-01), Gan et al.
patent: 2006/0226819 (2006-10-01), Xu et al.
Choosing the Right MOSFET Package, by Jason Zhang, Feb. 9, 2004.

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