Power Supply Dc Output Specification; Output Power/Currents; Standby Output; Voltage Regulation - Penguin Computing Relion 1900e Technical Manual

13.2 Power Supply DC Output Specification

13.2.1

Output Power/Currents

The following tables define the minimum power and current ratings. The power supply must meet both
static and dynamic voltage regulation requirements for all conditions.
Notes:
1. 12Vstby must provide 4.0A with two power supplies in parallel. The Fan may start to work when stby
current >1.5A
2. Peak combined power for all outputs shall not exceed 850W.
3. Length of time peak power can be supported is based on thermal sensor and assertion of the
SMBAlert# signal. Minimum peak power duration shall be 20 seconds without asserting the
SMBAlert# signal at maximum operating temperature.
13.2.2

Standby Output

The 12VSB output shall be present when an AC input greater than the power supply turn on voltage is
applied. There should be load sharing in the standby rail. Two PSU modules should be able to support 4A
standby current.
13.2.3

Voltage Regulation

The power supply output voltages must stay within the following voltage limits when operating at steady
state and dynamic loading conditions. These limits include the peak-peak ripple/noise. These shall be
measured at the output connectors.
13.2.4

Dynamic Loading

The output voltages shall remain within limits specified for the step loading and capacitive loading specified
in the table below. The load transient repetition rate shall be tested between 50Hz and 5kHz at duty cycles
ranging from 10%-90%. The load transient repetition rate is only a test specification. The ∆ step load may
occur anywhere within the MIN load to the MAX load conditions.
Note: For dynamic condition +12V MIN loading is 1A.
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Relion 1900e/2900e Manual

Table 51. Minimum Load Ratings

Parameter Min
12V main 0.0
12Vstby 1 0.0

Table 52. Voltage Regulation Limits

PARAMETER TOLERANCE
+12V - 5%/+5%
+12V stby - 5%/+5%

Table 53. Transient Load Requirements

Output ∆ Step Load Size
+12VSB 1.0A
+12V 60% of max load
Max. Peak 2, 3 Unit
62.0 70.0 A
2.1 2.4 A
MIN NOM MAX
+11.40 +12.00 +12.60
+11.40 +12.00 +12.60
Load Slew Rate Test capacitive Load
0.25 A/µsec 20 µF
0.25 A/µsec 2000 µF
UNITS
V
rms
V
rms
Revision 1.3