Artesyn MVME7100ET Single Board Computer Installation and Use (June 2014) - Manual (Page 78)

Functional Description
MVME7100ET Single Board Computer Installation and Use (6806800K87E) 78
4.11 XMC Expansion
The MVME7100ET provides an additional XMC/PMC module capability through the use of a
78-pin stacking connector. This connector is connected to the second 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 datasheet for additional details and/or programming
information.
4.12 Power Supplies
The MVME7100ET on-board voltages will be generated using Linear Tech LTC3828 dual output
two phase controllers and LTC3416 single output controllers. The following sections detail the
MVME7100ET power requirements.
4.12.1 Power Sequencing
In order to meet the power sequencing requirements of the various components on the
MVME7100ET, 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 will be 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 MVME7100ET 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.