Power Stamp Alliance launches controller specification

March 15, 2019 // By Nick Flaherty
Power Stamp Alliance launches controller specification
The Power Stamp Alliance (PSA) has published a new specification for a 48V controller stamp that will improve the usability of satellite power stamps while reducing the component count for server manufacturers.

A controller stamp includes all the control functionalities of a main stamp and, in place of the power conversion, adds bias voltage rails, eliminating the need for additional DC-DC converters on the board to provide bias voltage rails.

The specification for a 48V direct conversion DC-DC module provides all the bias voltage rails and control signals required by satellite stamps. It is aimed at servers, storage and computing systems where space near the processor is limited. The host system would only need to provide the 48 volt source rail for the controller and satellite stamps, removing the need for any primary and secondary bias voltages.

The power stamp designs are aimed at IT equipment and large data processing installations, many of which follow the principles of the Open Compute Project (OCP). The alliance was formally launched OCP last year with the publication of specifications, drawings and pin-out descriptions for main and satellite power stamps, and has since published an Orcad Library and Allegro Footprint Package (Macro) so that designers can use Power Stamps into their own schematic, along with the linked Allegro reference footprint for proper layout. It has also announced the industry’s first graphical user interface (GUI) that developers can use with products from any member company, and a new reference design board for high-current ASIC and/or FPGA chipsets.


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