Power and Signal Distribution

7.2.1 USDT Power Distribution

The USDT form factor uses an external (“brick”) supply that connects to the chassis through a three-conductor cable (Figure 7-1). The USDT power supply is available in 135-watt and180-watt versions. All voltages required by the processing circuits, peripherals, and storage devices are produced on the system board from the 19.5 VDC produced by the external power supply assembly. The external power supply always produces 19.5 VDC as long as it is connected to an active AC outlet.

Front Bezel

Power Button

USDT Chassis

System Board

Power On

Power Control Logic,

Voltage Regulators

+19.5

 

Rtn

Pwr rating

 

VDC

 

 

& ID

 

 

 

 

90 - 264 VAC

External

Power Supply

Unit

Figure 7-1. USDT Power Distribution, Block Diagram

Table 7-1 lists the specifications of the external supply.

Table 7-1.

USDT Power Supply Specifications

Parameter

135-watt supply

180-watt supply

Input Line Voltage Range

90–265 VAC

90–265 VAC

 

 

 

Line Frequency

47–63 Hz

47-63 Hz

 

 

 

Input Current, Maximum load @ 90 VAC

2.4 A

2.9 A

Output Voltage

19.5 VDC

19.5 VDC

 

 

 

Output Current, nominal load

3.5 A

4.6 A

 

 

 

Output Current, maximum load

6.9 A

9.2 A

Output Current, peak load (300 ms max) [1]

9.0 A

11 A

NOTES:

Total continuous power should not exceed power supply rating (i.e., 135 or180 watts).

[1] Using 100 VAC input. The output voltage is allowed to drop to a minimum of 15 VDC during the transient period.

7-2

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Technical Reference Guide

Page 74
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HP 8200 tower manual Usdt Power Distribution, Usdt Power Supply Specifications, Parameter Watt supply

8200 tower specifications

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