Specifications

850W Power Supply QSSC-S4R Technical Product Specification
106
12.3.6 Power Factor Correction (PFC)
The power supply incorporates a Power Factor Correction circuit. The power factor is greater than 0.99 at 100VAC to
127VAC input voltages under 50% to 100% loading.
12.3.7 AC Input Connector
The AC input receptacle is an IEC-320* C14 15A rated for 250VAC minimum.
12.4 DC Output Requirements
The DC output voltages remains within the regulation ranges shown in the following table when operating at steady
state and dynamic loading conditions. These limits include the peak-peak ripple/noise.
Table 46. DC Output Voltage Regulation Limits
Parameter Tolerance Minimum Nominal Maximum UNITS
+12V -5%/+5% +11.40 +12.00 +12.60 VDC
+3.3Vstandby -3%/+5% +3.20 +3.36 +3.528 VDC
12.4.1 Hot Swap Functionality
Hot swapping is the process of inserting and extracting a power supply from an operating power bay. During this
process, the output voltages remain within the limits specified in Error! Reference source not found., and the system
will continue to operate normally.
The hot swap feature is supported when the system is operating under static, dynamic, and zero loading conditions.
The power supply can be hot swapped by the following method:
x Extraction: The power supply may be removed from the system while operating with PSON# asserted, while in
standby mode with PSON# de-asserted, or with no AC applied.
x Insertion: The power supply may be inserted into the system with PSON# asserted, with PSON# de-asserted, or
with no AC power present for that supply.
12.4.2 Output Current Rating
The combined continuous output power for all outputs will not exceed 850W. Each output has a maximum and
minimum current rating shown in the following table.
Table 47. 850W Power Supply Load Ratings
Output Wattage 12V 3.3VSB
Max/Peak/Duration* Min Max Peak Min Max
850
W/1050Wpeak/10sec
0 A 69.2 A 88 A 0A 6.3 A
*Note: Values are at the system level. For 2+2/or 3+1 redundant systems, the load each power supply will provide will
be based on its current sharing accuracy.
12.4.3 Over- and Under-Voltage Protection
The power supply will provide latch mode over and under voltage protection as defined in the following table. A fault on
any output will cause the rest of the outputs to latch off. (In addition, see note 3 in the following table.) TBC
Table 48. Over- and Under-Voltage Limits
Level Under-Voltage Over- Voltage
Output Level Minimum Maximum Minimum Maximum
+3.3V standby
(see the notes below)
2.77V 3.00V 3.76V 4.3V
+12V 10.5 11.0 13.5 15.0
Notes:
1. In standby mode, the power supply will not latch off due to an under-voltage condition.
2. In standby mode, the power supply may or may not latch off due to an over-voltage condition.
3. A fault on any output other than +3.3V standby will not cause the +3.3V standby to turn off. A fault on
+3.3V standby will cause the other outputs to turn off.