Digital Controllers with PMBus Interface Target Highest-Density Isolated D2D Converters

Analog Devices, Inc. (ADI) has introduced the ADP1051 advanced digital power controller with PMBusâ„¢ interface targeting ultra-compact, high-density isolated dc-dc power supply systems with parallel/redundant capability. The ADP1051 is a versatile digital controller with six pwm (pulse width modulation) logic outputs that can be programmed using an easy-to use graphic user interface (GUI) via the PMBus interface.

The device enables high energy efficiency topologies including full bridge and active clamp forward variants with precision drive timing and control of secondary synchronous rectifiers. Energy efficiency is further optimized using adaptive dead-time compensation to improve the efficiency over the load range and programmable light load mode operation combined with low device power consumption (<100mW) to reduce system low power standby losses.

The ADP1051 implements an extensive PMBus command set including the ability to accurately read input and output power measurements and enable the end-user to make intelligent system management decisions to optimize energy efficiency. The small 4 x 4 mm LFCSP package makes the ADP1051 suited for high-density, ultra-compact isolated dc-dc power module or embedded designs for networking, communications and industrial applications ranging typically from 100W and higher.

The ADP1051 power controller is easily programmed using an intuitive graphical-user interface which enables customers to design and store settings in the high reliability, internal EEPROM memory. The ADP1051 implements several features to enable a robust system of parallel and redundant operation for customers that require high availability for increased current scaling. The device includes master/slave synchronization, reverse current protection and pre-bias start-up, accurate passive or droop current sharing between power supplies and a patented technique to identify and safely shutdown an erroneous power supply in parallel operation mode.

Key ADP1051 features and benefits include: Small 4 x 4mm package enables ultra-compact isolated dc-dc design; Extensive PMBus command set for programming and telemetry enabling intelligent power management and efficiency optimization; Digital control loop with six logic pwm logic signals to drive high-efficiency power supply topologies with controlled synchronous rectification; Adaptive dead-time compensation and light load modes; Robust parallel operating scheme for high-availability applications requiring redundancy including accurate droop current share, pre-bias start-up, reverse current protection and conditional overvoltage protection; And GUI programmability that promotes ease of use and reduces time to market.

These devices are rated for -40°C to +125°C operation. Packaged in a 24-lead LFCSP package, these devices cost $3.90 in lots of 1,000.