SLUSD37E October 2017 – November 2019 UCC28056
The voltage error amplifier is a transconductance amplifier. Voltage loop compensation connects from the error amplifier output, COMP, to ground. The recommended type-2 compensation network is shown in . For loop-stability purposes, the controller calculates the compensation network values based on small-signal perturbations of the output voltage using the nominal transconductance gain gM.
To improve the transient response to large perturbations, the error amplifier gain increases by a factor of six times (6×) when the error amplifier input deviates more than ±3% from the nominal regulation voltage, VOSReg. This increase allows faster charging and discharging of the compensation components to recover from step changes in load current.