| 摘要 |
A current mode DC-DC conversion device with fast transient response is provided. The device includes a DC-DC converter, a pulse width control unit, a current feedback circuit, a fast transient feedback circuit, a first error amplifier, an adder, and a comparator. The current feedback circuit generates a current feedback signal according to the current passing through an inductor in the DC-DC converter. The fast transient feedback circuit generates a transient feedback signal according to a first voltage feedback signal. The first error amplifier amplifies the difference value between a second voltage feedback signal and a reference signal to generate an error amplification signal. The comparator compares the error amplification signal and the summation of current feedback signal and transient feedback signal to generate a comparison signal. The comparison signal is provided to the pulse width control unit for controlling the duty cycle of the power switch. |
| 主权项 |
1. A current mode DC-DC conversion device with fast transient response, comprising:
a DC-DC converter, including an inductor and at least one power switch, wherein the power switch is coupled to the inductor, and the DC-DC converter converts an input voltage into an output voltage; a pulse width control unit, coupled to the power switch; a current feedback circuit, for detecting a current passing through the inductor, and for generating a current feedback signal according to the current passing through the inductor; a fast transient feedback circuit, for generating a transient feedback signal according to a first voltage feedback signal, wherein the first voltage feedback signal is responding to the output voltage; a first error amplifier, for amplifying a difference value between the a second voltage feedback signal and a reference signal to generate an error amplification signal, wherein the second voltage feedback signal is responding to the output voltage; an adder, for adding the current feedback signal and the transient feedback signal to generate a modifying current feedback signal; and a comparator, for comparing the error amplification signal with the modifying current feedback signal to generate a comparison signal, and providing the comparison signal to the pulse width control unit, wherein the pulse width control unit controls a duty cycle of the power switch of the DC-DC converter according to the comparison signal. |
