A power factor correction converter includes a rectifier, a power factor correction controller, a power stage circuit, and a feedback circuit, wherein the power factor correction converter converts an AC voltage into an output voltage. The power factor correction controller includes an analog-to-digital converter, a digital peak-hold circuit, a reference voltage generator, an error amplifier, and a pulse-width modulation circuit, wherein the power factor correction controller generates a driving signal according to a rectification signal and a feedback signal. The digital peak-hold circuit includes a delay circuit, a digital rising detector, a tracking register, a digital falling detector, and a holding register, wherein the digital peak-hold circuit generates a peak signal according to a digital input signal.