公开(公告)号：EP4492667A1

公开(公告)日：2025-01-15

申请号：EP24151503.0

申请日：2024-01-12

Applicant: GlobalFoundries U.S. Inc.

Inventor： Hoffmann, Matthias

IPC: H02M3/158 ,  H02M1/00 ,  H03K4/50 ,  H03K4/502

Abstract: To reduce sub-harmonic oscillations in a Switched-Mode Power Supply (SMPS). a ramp generator circuit of the SMPS produces a ramp signal having an amplitude corresponding to a sensed current through an energy storage device, such as an inductor, of the SMPS. The ramp signal is used to control a duty cycle of the SMPS. The ramp generator circuit may include a reference current circuit, a ramp capacitor, and a discharge circuit to periodically discharge the ramp capacitor. The ramp capacitor may be charged using a charging current produced by combining a feedback current corresponding to the sensed current with a reference current produced by the reference current circuit and may be periodically discharged at a fixed frequency, or may be charged using the reference current and discharged at a time determined according to the feedback current.