Patent ID: 9270259
Filing Date: 2016-02-23
CPC Classification: H02M,H03K

Claim Text:
1. A trimming circuit for a voltage generator, the voltage generator generating an output voltage according to a reference voltage, the trimming circuit comprising: a controller receiving a control clock signal and a trimming finish signal, and generating a trimming code, wherein if the trimming finish signal is inactivated, the trimming code is gradually changed from an initial value by the controller according to the control clock signal, wherein if the trimming finish signal is activated, the trimming code is no longer changed; a reference voltage supply circuit connected with the controller, and receiving the trimming code, wherein a fixed voltage is converted into the reference voltage by the reference voltage supply circuit according to the trimming code, wherein a magnitude of the reference voltage is in direct proportion to the trimming code; and an average voltage detector connected with the voltage generator, and receiving the output voltage and a target voltage, wherein the output voltage contains an average voltage in a DC form and a ripple voltage in an AC form, wherein when the average voltage reaches the target voltage, the trimming finish signal is activated by the average voltage detector.