| 主权项 |
1. A load regulation compensation module for a switching converter, wherein the switching converter comprises a switch module referenced to an internal reference ground connected to a package ground pin via a resistive component, and wherein the switch module is switched on and off based on a feedback signal indicative of an output voltage of the switching converter and a first reference signal indicative of a desired value of the output voltage, and wherein the on and off switching of the switch module generates a switching current flowing through the resistive component, resulting in an average offset voltage between the internal reference ground and the package ground pin, and wherein the load regulation compensation module comprises:
a current sense circuit, configured to sense the switching current flowing through the resistive component, and to provide a sense signal indicative of that switching current; a first filtering circuit, configured to receive the sense signal, and filter the sense signal to provide a first average signal indicative of an average of the sense signal; a gain circuit, configured to receive the first average signal, and to apply a first gain to the first average signal to generate a compensation signal; and a superposing circuit, configured to receive the compensation signal and a second reference signal having a bandgap reference voltage with respect to the internal reference ground, and to compensate the second reference signal with the compensation signal to generate the first reference signal, so that the average offset voltage is substantially cancelled out from the first reference signal with respect to the package ground pin. |
