System Description 4
miriac SBC-LX2160A User Manual
V 1.6
25/71
© MicroSys Electronics GmbH 2021
4.6.3 Power Supply Structure
■
The filtered Input Power from the ATX power supply feeds some 12V DC, 5V
DC and 3.3V DC components directly.
■
The LX2160A module is fed from 12V DC (8 pin connector) via an I2C current
sensor.
■
The 5V DC are fed to 2 secondary step-down converter in parallel, which
produces 1.3V and 0.88V DC. The 1.3V are fed into 3 low noise LDOs for the
40G / 100G Ethernet interfaces.
■
The 3.3V DC supply four secondary step-down converters in parallel, which
produce 2.5V, 1.8V, 1.5V and 1.1V DC.
■
The usage of the 5V and 3.3VDC ATX rails distributes the required power
more evently.
■
For components directly connected to the MPX-LX2160 SoM, the
carrier’s
3.3V
DC are enabled via a power switch, driven by the POWER_GOOD signal of
the SoM.
■
All step-down converters are enabled by the MPX-LX2160A SoM
POWER_GOOD signal.
The following diagram summarizes the Power Supply structure:
