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Input Voltage and Current
4 Input Voltage and Current
4.1 Input Voltages - EXPECTED
The power source for the VRM/EVRD is 12 V +5% / –8%. This voltage is supplied by a
separate power supply. For input voltages outside the normal operating range, the
VRM/EVRD should either operate properly or shut down.
4.2 Load Transient Effects on Input Current -
EXPECTED
The design of the VRM/EVRD, including the input power delivery filter, must ensure that
the maximum slew rate of the input current does not exceed 0.5 A/µs, or as specified
by the separate power supply.
Note: In the case of a VRM design, the input power delivery filter may be located either on
the VRM or on the baseboard. The decision for the placement of the filter will need to
be coordinated between the baseboard and VRM designers.
It is recommended that the bulk input decoupling (with optional series 0.1-1 µH
inductor) be placed on the baseboard by the VRM input connector and high frequency
decoupling on the VRM module. Expected baseboard decoupling should be between
1000 µF to 2240 µF depending on VRM design and system power supply.
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