Control circuit of DC-DC converter and control method thereof

Details Control circuit of DC-DC converter and control method thereof Control circuit of DC-DC converter and control method thereof

2007-05-15

2007-05-15

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

External or operator controlled

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

C323S224000, C323S284000

Reexamination Certificate

active

11402129

ABSTRACT:
There are provided a control circuit of a DC-DC converter of a synchronous rectification system which can realize rapid lowering of an output voltage with low power consumption at the stop of power supply, and a control method thereof. While a power supply stop signal is at low level, a control part controls an NMOS transistor according to the output signals of a comparator and a flip-flop circuit. While the power supply stop signal is at high level, the control part masks a reverse current detection signal and the output signal of the flip-flop circuit to control the NMOS transistor according to a detection signal of a comparator. When a choke coil current is reversely flowed and an output voltage is lowered to an output reference voltage corresponding to a reference voltage, the NMOS transistor is brought to the non-conductive state to regenerate the electric power to an input terminal.

REFERENCES:
patent: 6151233 (2000-11-01), Kondo
patent: 6307356 (2001-10-01), Dwelley
patent: 6437549 (2002-08-01), Takagishi
patent: 6541947 (2003-04-01), Dittmer et al.
patent: 6577110 (2003-06-01), Van Auken
patent: 6870354 (2005-03-01), Nishimaki
patent: 09-154275 (1997-06-01), None
patent: 2004-056992 (2004-02-01), None

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