International Rectifier CHiL digital PWM controller range

The CHiL digital PWM controllers dramatically shrink footprint and improve efficiency in a variety of mid-range to high-end and extreme server, desktop and computing applications.

The six devices meet Intel VR12 and VR12.5 and AMD SVI1 and SVI2 specifications, and support multiphase designs from one to eight phases operating one to two loops.

These third-generation devices offer efficiency-shaping features such as phase shedding and variable gate drive with enhanced algorithms including PID scaling (when shedding phases) and phase current balancing to ensure maximum efficiency.

The solution architecture supports the high di/dt transients from high-end processors and, as a result of a new adaptive transient algorithm, the transients can be met with fewer phases and fewer capacitors to shrink system size.

The family offers flexible phase configurations that allow users to vary the number of phases on each voltage loop to optimise cost and efficiency for each load.

The controllers feature a 30% reduction in operating current to help meet higher efficiency goals during low-load operation. For protection of high-end circuits, the devices offer improved pulse-by-pulse current limit protection, controlled pulse width limiting and a new phase imbalance/phase missing fault feature.

They support phase doubling using the company’s IR3598 to drive two phases from each PWM output. The devices also sense 12, 5 and 3.3 V supplies without special sequencing and feature PMBUS telemetry.