Phase controller for desktop and notebook CPU applications

The NCP81243 dual output three plus two phase buck solutions, stocked by Farnell element14, are optimised for Intel IMVP8 CPUs. The device offer five PWM drive signals that can be configured in multiple setups. The controller combines true differential voltage sensing, differential inductor DCR current sensing, input voltage feed-forward, and adaptive voltage positioning to provide accurately regulated power for both desktop and notebook applications. The control system is based on Dual-Edge pulse-width modulation (PWM) combined with DCR current sensing providing an ultra fast initial response to dynamic load events and reduced system cost. The device provides the mechanism to shed phases during light load operation and can auto frequency scale in light load conditions while maintaining excellent transient performance. Dual high performance operational error amplifiers are provided to simplify compensation of the complete system. Patented dynamic reference injection further simplifies loop compensation by eliminating the need to compromise between closed-loop transient response and Dynamic VID performance. Patented total current summing provides highly accurate current monitoring for droop and digital current monitoring.