User guide

PH440 NLX Motherboard User Guide September 1998
MITSUBISHI ELECTRIC MOTHERBOARD DIVISION PAGE 39 OF 51
6 ELECTRICAL
POWER REQUIREMENTS
The motherboard power requirements are heavily dependent on system configuration and the
software being used. The table below can be used as a guide to the likely power supply
requirements. They are measured using a 400MHz Intel Pentium II
®
Processor, 3 memory
modules and 8MB video memory running stress test software designed to yield worst case
results. They should not, however, be regarded as maximum values.
Supply +5V
standby
+5V +3.3V +12V -12V -5V
Voltage
Tolerance
±
5%
±
5%
±
3%
±
5%
±
5%
±
5%
Maximum
Current (in above
configuration)
20mA 5A 3A 300mA 100mA 100mA
Warning
Ensure that the system does not overload the +5V standby output of the power supply –
permanent damage to the motherboard may result.
This motherboard requires a +5V standby supply to operate correctly. This is normally
provided by an NLX-compatible power supply via the riser.
PCB
The PCB is a four-layer design measuring W9.0” x L11.2”. It is NLX compatible. The inner
power planes are arranged so that the ground plane is nearest the top component layer.
The PCB has a UL flammability rating of 94V-0.