Apparatus and method for monotonic start up of a synchronous...

Details Apparatus and method for monotonic start up of a synchronous... Apparatus and method for monotonic start up of a synchronous...

2006-09-19

2006-09-19

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S284000, C323S286000

Reexamination Certificate

active

07109688

ABSTRACT:
A controller for a synchronous switching regulator is arranged to control a switch with a control signal, and to control a synchronous switch with a synchronous switch control signal. The controller disables the synchronous switch control signal at power-up so that the regulator operates with asynchronous rectification. Also, the controller is arranged to detect whether the regulator is in discontinuous or continuous conduction mode by determining whether a switch node voltage at the switch node a switch node stays negative. The regulator keeps operating with asynchronous rectification until the switch node voltage stays negative for the entire off period of the switch, which indicates the regulator is operating in continuous conduction mode. At this point, the controller enables assertion of the synchronous switch control signal, so that the regulator operates with synchronous rectification. The controller is arranged to enable the output voltage to rise monotonically when driving a prebiased load.

REFERENCES:
patent: 5986895 (1999-11-01), Stewart et al.
patent: 6101104 (2000-08-01), Eng
patent: 6198638 (2001-03-01), Lee
Texas Instrument, “Low-Input Voltage-Mode Synchronous Buck Controller”, TPS 40000, TPS 40001, TPS 40002, TPS 40003, TPS 40004, TPS 40005, SLUS507C—Jan. 2002—Revised Jun. 2004, pp. 1-19, can be found at www.ti.com.

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