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Output regulation is obtained using the error amp to set the switch current trip point. The erroramp is a transcon- ductance amplifier that integrates the difference between the feedback output voltage and an internal l.25V refer- ence. The output of the error amp adjusts the switch current trip point to provide the required load current at the desired regulated output voltage. This method of controlling current rather than voltage provides faster input transient response, cycle by cycle current limiting for better output switch protection and greater ease in compensating the feedback loop.