Digital Controller for Isolated Power Supply with PMBus Interface
The ADP1051 is an advanced digital controller with a PMBus™ interface targeting high density, high efficiency dc-to-dc power conversion. This controller implements voltage mode control with high speed, input line feedforward for enhanced transient and improved noise performance. The ADP1051 has six programmable pulse-width modulation (PWM) outputs capable of controlling most high efficiency power supply topologies, with added control of synchronous rectification (SR). The device includes adaptive dead time compensation to improve efficiency over the load range, and programmable light load mode operation, combined with low power consumption, to reduce system standby power losses.
The ADP1051 implements several features to enable a robust system of parallel and redundant operation for customers that require high availability or parallel connection. The device provides synchronization, reverse current protection, pre-bias startup, accurate current sharing between power supplies, and conditional overvoltage techniques to identify and safely shut down an erroneous power supply in parallel operation mode.
The ADP1051 is based on flexible state machine architecture and is programmed using an intuitive GUI. The easy to use interface reduces design cycle time and results in a robust, hardware coded system loaded into the built-in EEPROM. The small size (4 mm × 4 mm) LFCSP package makes the ADP1051 ideal for ultracompact, isolated dc-to-dc power module or embedded power designs.
- High density, isolated DC/DC power supplies
Intermediate bus converters
High availability parallel power systems
- Server, storage, industrial, networking, and communications infrastructure
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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The ADP1051-240-EVALZ evaluation board and the ADP1051DC1-EVALZ daughter card feature the ADP1051 in a dc-to-dc switching power supply in full bridge topology with synchronous rectification. The circuit is designed to provide a rated load of 12 V, 20 A from a dc input voltage source of 36 V dc to 75 V dc. The ADP1051 provides functions such as output voltage regulation, synchronization, constant current control, prebias start up, direct paralleling, and comprehensive protection.
Power Reference Designs
Using the ADP1051 Eighth Brick Power Module Reference Design
Designing Digital Power Supplies With A State Machine