Digital PWM controllers deliver highest efficiency multiphase solutions in smallest footprint
The new third generation CHiL 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 (ATA), the transients can be met with fewer phases and fewer capacitors to shrink system size.
The new CHiL digital PWM controllers feature a 30 percent 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 a new phase imbalance/phase missing fault feature.
The devices fully support phase doubling using IR’s IR3598 to drive two phases from each PWM output. The devices also sense 12 V, 5 V and 3.3 V supplies without special sequencing and feature PMBUS telemetry.
When designed with IR’s DirectFET power MOSFETs and PowIRstage integrated devices, the CHiL product line enables smaller solutions by combining the density advancements of DirectFET and PowIRstage. The highly digital nature of these devices enables low pin count solutions in a 0.4 mm pitch QFN packages, and an improved transient response that eliminates at least one SP bulk capacitor and many ceramic capacitors to deliver the smallest and most efficient solution.
IR offers dedicated demo boards and fully documented reference designs. These CHiL digital power solutions are fully supported by IR’s real-time GUI available at www.irf.com for design and development, and hardware interface tools to communicate and program the CHiL devices. Additionally, hardware support using IR’s proprietary SVID emulator system enables customers to emulate and monitor either Intel or AMD serial interface protocols, as well as high speed I2C communication.
Visit International Rectifier at www.irf.com
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