Anpec Electronics Corporation

Chia-Chieh Weng

Chin-Hong Chen

Po-Hsueh Kuo

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.

Current mode DC-DC conversion device with fast transient response

A synchronous DC-DC converter having a soft-stop function includes an output stage for supplying an output voltage, wherein the output stage includes a high-side transistor for charging the output voltage and a low-side transistor for discharging the output voltage; an output control circuit, coupled to the output stage, for controlling the high-side transistor and the low-side transistor of the output stage; at least one protection device, for controlling the high-side transistor to be turned off when a specific situation occurs, in order to stop supplying the output voltage; and a soft-stop control circuit, coupled to the output control circuit, for controlling the low-side transistor of the output stage to be turned on when the protection device controls the high-side transistor to be turned off or the synchronous DC-DC converter is disabled, in order to discharge the output voltage.

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Nantou County, Taiwan

Chia-Chieh Weng