Modeling Approach for Constant on-time Control with Virtual Inductor Current and OTA compensation
Journal
2025 IEEE Industry Applications Society Annual Meeting (IAS)
Start Page
1-5
Date Issued
2025-06-15
Author(s)
Abstract
DC-DC converters are extensively employed to supply power to central processing units (CPUs) and system-on-chips (SoCs), which frequently encounter rapid load current transients that can lead to significant output voltage fluctuations. Ripple-based constant on-time (RBCOT) control is well regarded for its fast transient response; however, it suffers from inherent stability limitations. To improve system stability, Virtual Inductor Current (VIC) was introduced into the inner control loop. However, its operational performance is inherently limited by bandwidth constraints. To overcome this limitation, an operational transconductance amplifier (OTA) compensator is incorporated into the outer control loop to enhance the overall bandwidth. This work presents a comprehensive mathematical model of the RBCOT control scheme augmented with VIC and OTA compensation and validates its accuracy through SIMPLIS-based simulations.
Publisher
IEEE
Type
conference paper