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7-2 361834-002 Technical Reference Guide
Power and Signal Distribution
7.2.1 Power Supply Assembly
These systems feature power supplies with power factor-correction logic. Four power supplies
are used: a 200-watt power supply for the USDT unit, a 240-watt power supply for the SFF and
ST units, a 300-watt power supply for the MT unit, and a 340-watt power supply for the CMT
unit. All power supplies except that for the MT feature active power factor correction (PFC) and
auto-ranging. The 300-watt power supply uses passive PFC and an AC select switch. Tables 7-1
through 7-4 list the specifications of the power supplies. Note that output load voltages are
measured at the load-side of the output connectors.
NOTES:
Total continuous power should not exceed 200 watts. Total surge power (<10 seconds w/duty cycle < 5 %) should not exceed
230 watts.
[1] Minimum loading requirements must be met at all times to ensure normal operation and specification compliance.
[2] Surge duration no longer than 10 seconds with 12-volt tolerance at +/- 10%.
[3] +12 VDC output can be split by the system board to +12 VDC (@ 3 A) and +12 Vcpu (@ 12.5 A) power planes.
NOTES:
Total continuous power should not exceed 240 watts. Total surge power (<10 seconds w/duty cycle < 5 %) should not exceed
260 watts.
[1] The minimum current loading figures apply to a PS On start up only.
Table 7-1.
200-Watt (USDT) Power Supply Assembly Specifications
Range or
Tolerance
Min.
Current
Loading [1]
Max.
Current
Surge
Current [2]
Max.
Ripple
Input Line Voltage:
115–230 VAC (auto-ranging) 90–264 VAC -- -- -- --
Line Frequency 47–63 Hz -- -- -- --
Input (AC) Current -- -- 4.0 A -- --
+3.33 VDC Output +
4 % 0.1 A 12.0 A 12.0 A 50 mV
+5.08 VDC Output +
3.3 % 0.3 A 10.0 A 10.0 A 50 mV
+5.08 AUX Output +
3.3 % 0.0 A 2.0 A 2.0 A 50 mV
+12 VDC Output [3] + 5 % 0.1 A 15.5 A 18.0 A 120 mV
-12 VDC Output +
10 % 0.0 A 0.15 A 0.15 A 200 mV
Table 7-2.
240-Watt (SFF/ST) Power Supply Assembly Specifications
Range/
Tolerance
Min.
Current
Loading [1]
Max.
Current
Surge
Current [2]
Max.
Ripple
Input Line Voltage:
115–230 VAC (auto-ranging) 90–264 VAC -- -- -- --
Line Frequency 47–63 Hz -- -- -- --
Input (AC) Current -- -- 5.0 A -- --
+3.3 VDC Output +
4% 0.1 A 19.0 A 19.0 A 50 mV
+5.08 VDC Output +
3.3 % 0.3 A 14.0 A 14.0 A 50 mV
+5.08 AUX Output +
3.3 % 0.0 A 3.0 A 3.0 A 50 mV
+12 VDC Output +
5 % 0.1 A 7.5 A 9.0 A 120 mV
+12 VDC Output (Vcpu) + 5 % 0.1 A 12.5 A 12.5 A 120 mv
--12 VDC Output +
10 % 0.0 A 0.15 A 0.15 A 200 mV