Power and Signal Distribution

7.2.2 SFF/MT/CMT Power Distribution

The SFF, MT, and CMT systems use a common power source power supply unit contained within the system chassis. Figure 7-2 shows the block diagram for power distribution for SFF/MT/CMT form factors.

Front Bezel

Power Button

Power On

90 - 264 VAC

System Board

Power Control Logic, DC/DC Converter

& Voltage Regulators

 

P1

 

 

P2

 

 

P3

+12 Vmain

+12 Vsb

-12 V

PS

Fan

Fan

Pwr

+12 Vcpu

On

Cmd

Spd

Good

 

Power Supply Unit

P3

34

12

P2

6 5 4 3 2 1

P1

46

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 V

+12 Vmain

+12 Vmain

+12 Vsb

P2

FANcmd

Fan Speed

PS On

Pwr Good

Rsvd

Rsvd

 

 

 

 

 

 

 

P3

RTN

RTN

+12 Vcpu

+12 Vcpu

 

 

 

 

 

 

 

 

 

NOTES:

Connectors not shown to scale.

All + and values are VDC.

Rsvd= Reserved

RTN = Return (signal ground)

Figure 7-2. SFF/MT/CMT Power Distribution and Cabling, Block Diagram

The +12Vsb (auxilary) voltage is always produced by the power supply unit as long as the system is connected to a live AC source. When the PS On signal is asserted, the power supply unit produces the +12 Vmain, +12 Vcpu, and -12 V outputs.

The standard 240-watt and 320-watt power supplies have a 70% minimum efficiency rating at 100% of the rated load, measured while operating from 100 VAC @60 Hz and 230 VAC @ 50 Hz.

The optional 80Plus Gold-rated high-efficiency 240-watt and 320-watt power supplies operate at the following efficiencies while operating from 100 VAC @60 Hz and 230 VAC @ 50 Hz :

100% of rated load: 87% efficient

50% of rated load: 90% efficient

20% of rated load: 87% efficient

Technical Reference Guide

www.hp.com

7-3

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HP 8200 tower manual 2 SFF/MT/CMT Power Distribution, Power Supply Unit 4 3 2

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