Power Supply

Power Supply

The power supply converts the ac voltage to dc voltage and provides power for the following:

ŸSystem board set

ŸDiskette drive

ŸHard disk drive

ŸCD-ROM drive

ŸAuxiliary devices

ŸKeyboard

ŸLCD panel

ŸPCMCIA cards

ŸDVD drive

Voltages

The power supply generates six

different

dc voltages: VCC5M,

VCC3M, VCC12,

and

VCCSW. Figure 1-8

shows the

maximum

current for

each

voltage.

 

 

 

 

 

 

 

 

 

 

Output

 

Voltage (V dc)

 

Current (A)

 

 

 

 

 

 

 

 

 

 

VCC5M

 

 

+5.0

 

5.80

 

 

 

 

 

 

 

 

 

 

VCC3M

 

 

+3.3

 

6.00

 

 

VCC12

 

 

+12.0

 

0.50

 

 

 

 

 

 

 

 

 

 

VCCSW

 

 

+5.0

 

0.01

 

 

 

 

 

 

 

 

 

 

Figure 1-8. Power Supply Maximum Current

1-10 System Overview

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IBM 770 manual Power Supply, Voltages, System Overview