Analog Devices Digital PFC Controller with Power Metering Offers Interleaving and Bridgeless Functionality

Analog Devices, Inc. (ADI) introduced the ADP1048, the first interleaved digital power factor correction (PFC) controller with highly accurate ac power metering capability. Similar to the ADP1047 single-phase digital PFC controller (announced March, 2011), the interleaved (or dual-phase) ADP1048 uses conventional, continuous-conduction-mode PFC techniques to reduce harmonic distortion.

The ADP1048 can be configured as an interleaved design to reduce inductor size and replace the ac-dc rectifier to improve efficiency in bridgeless boost mode. These techniques convert all signals to the digital domain and allow parameters to be adjusted and reported over a PMBus™-compliant interface, including accurate measurement of input voltage, current and power. The ADP1048 is extremely versatile and easy-to-use enabling ac-dc designers and system architects to tweak their design in real-time and optimize efficiency at system level.

As with the ADP1047 single-phase controller, the ADP1048 interleaved PFC controller is easily programmed using an intuitive graphical-user interface (GUI), which enables customers to design and optimize their systems without the complex code programming required by alternative digital signal processor (DSP)-based devices. Designed specifically for high reliability ac-dc power-factor correction systems and motor control applications, the ADP1048 is suited to communications infrastructure, industrial and instrumentation systems, such as motor control, and high-power medical imaging applications.

The ADP1048 provides power metering accuracy of ±3 percent at full load current with further improvements to ±1 percent with customer calibration. The new digital controller also offers enhanced transient response through non-linear control algorithms, programmable inrush control to reduce start-up over-stress, real-time programming to maximize efficiency and extensive fault detection and reporting for improved reliability. The ADP1048 can be frequency synchronized to eliminate "beat" frequency noise, or alternatively, the switching frequency spread spectrum feature can be enabled to further improve EMI.

Key ADP1048 features and benefits include:

– Interleaved capability enables reduction in inductor and solution size and is suited to high-power-level PFC

– Flexible, digital-control-loop PFC enables optimized harmonic correction

– True RMS AC metering capability provides high accuracy power measurement

– GUI programmability promotes ease of use and reduces time to market

– PMBus compliance allows a standardized system software interface

The ADP1048 and ADP1047 digital PFC controllers are designed to complement the ADP1043A digital controller for isolated systems, high-speed MOSFET drivers and iCoupler® digital isolators, which also are available from Analog Devices.

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