Intel MPCBL0001 manual Onboard Power Supplies

Intel NetStructure® MPCBL0001 High Performance Single Board Computer

Contents

2.2.7Onboard Power Supplies

The main power supply rails on the MPCBL0001 SBC are powered from dual-redundant -48 V power supply inputs from the backplane power connector (P10). There are also dual redundant, limited current, make-last-break-first (MLBF) power connections. See Figure 20, “Component Layout (#1)” on page 100 for their location.

2.2.7.1Power Feed Fuses

As required by the PICMG 3.0 Specification, the MPCBL0001 SBC provides fuses on each of the -48V power feeds and on the RTN connections as well. The fuses on the return feeds are critical to prevent overcurrent situations if an ORing diode in the return path fails and there is a voltage potential difference between the A and B return paths.

2.2.7.2ORing Diodes and Circuit Breaker Protection

The two -48 V power connectors are OR’d together. A current limiting FET switch is connected between the OR’d -48 V and the primary DC-DC converters. The FET switch provides three functions:

•A mechanism to electrically connect/disconnect the SBC to/from the two -48 V inputs.

•A soft-on function.

•An over-current circuit breaker feature.

2.2.7.3-48 V to +12 V Converter

This converter provides DC isolation between the -48 V and -48 V return connections and all of the derived DC power on the MPCBL0001 SBC. Its output is connected to the SBC’s +12 V power rail. The converter supplies a maximum of 9 A of current. The converter is enabled/disabled by the onboard IPMC.

2.2.7.4-48 V to +5 V/+3.3 V Converter

This converter provides DC isolation between the -48 V and -48 V return connections and all of the derived DC power on the MPCBL0001 SBC. Its output is connected to the SBC’s +5 V and 3.3 V power rails. The converter supplies a maximum of 9 A of +5 V current and 9 A of +3.3 V current. The converter is enabled/disabled by the onboard IPMC.

2.2.7.5Processor Voltage Regulator Module (VRM)

The Voltage Regulator Module (VRM) provides core power to the two Low Voltage Xeon processors. The input to the VRM is connected to the +12 V power rail.

See Figure 20, “Component Layout (#1)” on page 100 for its location.

Technical Product Specification	27
Order #273817