
Power and Signal Distribution
Table 7-1 lists the specifications of the external supply.
Table
USDT 135-Watt Power Supply Unit Specifications
Parameter |
|
Input Line Voltage Range | |
Line Frequency | |
Input Current, Maximum load @ 90 VAC | 2.4 A |
Output Voltage | 19.5 VDC |
Output Current, nominal load | 3.5 A |
Output Current, maximum load | 6.9 A |
Output Current, peak load (300 ms max) [1] | 9.0 A |
NOTES:
Total continuous power should not exceed 135 watts. Total surge power (<10 seconds w/duty cycle < 5 %) should not exceed 170 watts.
[1]Using 100 VAC input. The output voltage is allowed to drop to a minimum of 15 VDC during the transient period.
7.3SFF/CMT Power Distribution
The SFF and CMT form factors use a common power source power supply unit contained within the system chassis. Figure
Front Bezel
Power Button
System Board
P3
3 4
Power Control Logic, DC/DC Converter |
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Power On | & Voltage Regulators |
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| P1 |
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| P2 |
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| P3 | P2 | |
+12 Vmain | +12 Vsb | PS | Fan | Fan | Pwr | +12 Vcpu | |||
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On | Cmd | Spd | Good |
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| 6 5 4 3 2 1 | ||
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| P1 |
4 6
90 - 264 VAC |
| Power Supply Unit |
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1 3
NOTE: Return (RTN or ground) not shown.
Conn | Pin 1 | Pin 2 | Pin 3 | Pin 4 | Pin 5 | Pin 6 |
P1 | RTN | RTN | +12 Vmain | +12 Vmain | +12 Vsb | |
P2 | FANcmd | Fan Speed | PS On | Pwr Good | RTN | RTN |
P3 | RTN | RTN | +12 Vcpu | +12 Vcpu |
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NOTES:
Connectors not shown to scale.
All + and – values are VDC.
RTN = Return (signal ground)
Figure 7-2. SFF/CMT Power Distribution and Cabling, Block Diagram
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