COT control eliminates the error amplifier and produces a PWM signal with a fixed ON time every time the FB falls below VREF. If during the time where VFB <VREF is monotonic or in phase with the inductor ripple, then the system can operate at a fixed frequency based on the ton setting.
Solution: Use constant-on-time (COT) control to fix the on time while allowing the frequency to change. For applications where fast transient responses are required, current mode control is not fast enough. Thought Process: Transient response can be improved by not waiting for the clock.
frequency response of the control loop. This application report reviews type-3 ripple injection design and how the component selection relates to stability in the time and frequency domains.
Solution: Use constant-on-time (COT) control to fix the on time while allowing the frequency to change. 2. Vout dropping directly and immediately causes duty cycle to increase. 1. Sudden. Adaptive COT control uses the conversion ratio (VOUT/VIN) to adjust the one-shot timer that sets the on time (tON).
To eliminate input impedance impact on the measurements, wide (frequency) range of bypass capacitors are connected at each board edge. Kept the original EVM design *1: for further comparisons, 2nd configuration of CM-IC is prepared whose EVM has a higher switching frequency setting. VM-IC: D VIN = VOUT No VIN difference, no ringing.
TI’s fixed-frequency direct control with seamless transition into power save mode (fixed-frequency DCS-Control) topology builds on the popular COT DCS-Control topology with its fast transient response, and adds an oscillator to achieve fixed-frequency operation with optional clock synchronization.
Adaptive Constant On-Time Control Technique Application in …
Abstract: A continous-conduction mode synchronous boost converter controlled with adaptive Constant On-Time (COT) technique is presented. This method focuses on operating a DC-DC converter with a fixed switching frequency while retaining the benefits of a COT, such as the elimination of the need for slope compensation.
A quasi fixed frequency constant on time controlled boost …
This paper presents a quasi fixed frequency constant on time (COT) controlled boost converter, it has no loop compensation requirement. With the proposed COT control, pulse frequency modulation (PFM) comes free at light load, which improves the light load efficiency compared with traditional PWM control.
(PDF) Minimum Output Ripple and Fixed Operating Frequency …
Oct 1, 2019 · This paper proposes a minimum output ripple and fixed operating frequency technique based on the modulation injection for a constant on-time (COT) ripple control converter.
TI’s fixed-frequency direct control with seamless transition into power save mode (fixed-frequency DCS-Control) topology builds on the popular COT DCS-Control topology with its fast transient response, and adds an oscillator to achieve fixed-frequency operation with optional clock synchronization.