Spire BLACKDRAGON 400 / SP-R-400WTB-PFC - Manual (Page 9)

Version:A/0 Page 9 of 18
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2.2.7 Output Transient Response
The table below summarizes the output transient steps for each output. The
Transient slew rate is =0.5A/
μ s.
Table 6. DC Output Transient Response Specifications
DC Output Maximum Step Size Output Voltage Tolerance
+12V1DC 40% of rated output ±5%
+12V2DC 60% of rated output ±5%
+5VDC 30% of rated output ±5%
+3.3VDC 30% of rated output ±5%
-12VDC 0.1A ±10%
+5VSB 0.5A ±5%
2.2.8 Capacitive Load
The power supply is able to power up and operate normally with the following
capacitances simultaneously present on the DC outputs.
Table 7. Output Capacitive Loads
DC Output ATX12V Capacitive Load (μF)
+12 V1DC 5,000
+12 V2DC 3,000
+5 VDC 6,000
+3.3 VDC 6,000
-12 VDC 350
+5 VSB 350
2.2.9 Closed-loop Stability
The power supply is unconditionally stable under all line/load/transient loads
Conditions including capacitive loads specified in Table 7. A minimum of 45
degrees phase margin and 10 dB gain margin is recommended at both the
maximum and minimum loads.
2.2.10 Power Sequencing
All outputs, regardless of loading, turn on within 50ms of each other. The 5VSB
output is in regulation for a minimum of 10ms prior to the other output rails
reaching regulation.