SLUSDX1 September 2020 TPS563211
The device employs AECM control, an emulated current control based topology that combines the advantages of peak current mode control and D-CAP2 control, providing fast transient response with true fixed switching frequency. The AECM control topology supports two basic regulation modes, which are PFM regulation mode and PWM regulation mode. During PWM, it operates at its nominal switching frequency in CCM or DCM. The frequency is typically about 600 kHz with a controlled frequency variation. If the load current decreases, it enters PFM to sustain high efficiency down to very light loads. In PFM, the switching frequency decreases with the load current. With the internal adaptive loop adjustment, the device eliminates the need for external compensation to provide a fast transient response over a wide output voltage range.