5
3.2
DC Output Requirements
3.2.1 DC Voltage Regulation
The DC output voltages shall remain within the regulation ranges shown in Table 3 when
measured at the load end of the output connectors under all line, load, and environmental
conditions. The voltage regulation limits shall be maintained under continuous operation
for a period of time equal to or greater than the MTBF specified in Section 7.2 at any
steady state temperature and operating conditions specified in Section 5.
Table 3: DC Output Voltage Regulation
Output
Range Min. Nom. Max. Unit
+12Vdc
±
5% +11.40 +12.00 +12.60 Volts
+5Vdc
+5-4% +4.80 +5.00 +5.25 Volts
+3.3Vdc
+5-4% +3.17 +3.30 +3.46 Volts
-5Vdc
±
5% -4.75 -5.00 -5.25 Volts
-12Vdc
±
10% -11.40 -12.00 -13.20 Volts
+5Vsb
±
5% +4.75 +5.00 +5.25 Volts
3.2.2
Remote Sensing
a.
For the +12V, +5 V and +3.3 V, the power supply shall use remote sensing wires to
achieve regulation at the output connector to compensate for voltage drop of cable,
connector, and PCB trace. If the remote connection is lost to any of these outputs, then
internal resistive feedback causes the power supply to regulate and prevent OVP.
b. The power supply should have remote sense return (Returns) to regulate out ground drops
for all output voltages, +12V, +3.3V, and +5V. The power supply will uses remote sense
(+3.3Vs, +5Vs, +12Vs) to regulate out drops in the system for the +3.3V, and +5V
outputs. Remote sense must be able to regulate out a minimum of 250mV of drop on the
+3.3V and +5V outputs. The remote sense return (Returns) must be able to regulate out a
minimum of 100mV of drop in the power ground return. The current in any remote sense
line shall be less than 10mA to prevent voltage sensing errors. The power supply must
operate within specification over the full range of voltage drops from the power supply's
output connector to the remote sense points.
3.3
Power Distribution:
