DC-DC converter and error amplifier thereof

Details DC-DC converter and error amplifier thereof DC-DC converter and error amplifier thereof

2007-08-07

2007-08-07

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

C323S283000

Reexamination Certificate

active

11606926

ABSTRACT:
A DC-DC converter includes an error amplifier that includes an operational transconductance amplifier (OTA), a compensation circuit, and a fast transient controller. The OTA includes a compensation resistor, a compensation capacitor of Cz, and a Miller circuit. The equalization capacitance generated by the compensation capacitor and the Miller circuit is (1+k) Cz. The Miller circuit includes three transistors operated in the triode region. The ratio of the current through the transistors is 1:mk:(1−m)k. The current through the compensation capacitor in a second mode is (1+mk) times that in a first mode. The fast transient controller switches the Miller circuit between the first and second modes according to a feedback voltage dependent on the output voltage of the DC-DC converter.

REFERENCES:
patent: 5481178 (1996-01-01), Wilcox et al.
patent: 5912552 (1999-06-01), Tateishi
patent: 6064187 (2000-05-01), Redl et al.
patent: 6229292 (2001-05-01), Redl et al.
patent: 6894471 (2005-05-01), Corva et al.
patent: 6909268 (2005-06-01), Taghizadeh-Kaschani

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