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.

Table 7-1.

200-Watt (USDT) Power Supply Assembly Specifications

 

 

Min.

 

 

 

 

Range or

Current

Max.

Surge

Max.

 

Tolerance

Loading [1]

Current

Current [2]

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

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.

Table 7-2.

240-Watt (SFF/ST) Power Supply Assembly Specifications

 

 

Min.

 

 

 

 

 

Range/

Current

Max.

Surge

Max.

 

Tolerance

Loading [1]

Current

Current [2]

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

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.

7-2

361834-002

Technical Reference Guide