4.11 Xmc Expansion; 4.12 Power Supplies; 4.12.1 Power Sequencing; 4.12.2 Power Supply Monitor - Emerson MVME4100 Installation And Use Manual

Functional Description

4.11 XMC Expansion

The MVME4100 provides an additional XMC/PMC module capability through the use of a
78-pin stacking connector. This connector is connected to the PCI Express port on the
processor. Up to four additional XMC/PMC modules may be added by using two expansion
boards. Refer to the XMCspan manual for additional details and/or programming information.

4.12 Power Supplies

The MVME4100 on-board voltages are generated using Linear Tech LTC3828 dual output two
phase controllers and LTC3416 single output controllers. The following sections detail the
MVME4100 power requirements.

4.12.1 Power Sequencing

In order to meet the power sequencing requirements of the various components on the
MVME4100, the power supply controllers implement voltage tracking which allows the power
supply outputs to track each other coincidentally during power up and power down. The
+3.3 V supply output is used as the tracking reference. All supply outputs will reach their final
values within 20 milliseconds during power up.

4.12.2 Power Supply Monitor

Logic is provided on-board to monitor the PGOOD signal from the LTC3828 and LTC3416
regulators to determine if the power supply outputs are within tolerance. If any of the power
supplies fail, this logic shuts off the power supplies to avoid any component damage. If the
+5.0 V power supply is still good during a fail condition, a planar red LED (PWR FAIL D9) is
illuminated to indicate the power supply fail condition.

4.12.3 Power Supply Filtering and Fusing

Each of the switching power supply inputs on the MVME4100 will have an inductor to reduce
switching noise from being fed back onto the +5.0 V input. The LTC3828 supplies will each have
a 10 A fuse to protect the supplies from over-current in case of component failure.
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MVME4100 Single Board Computer Installation and Use (6806800H18D)