Power Supply; Outputs; Component Maximum Current; Channel Load Current - IBM Personal System/2 50 Technical Reference

, Power Supply
| The power supply requires a sinewave input and converts the ac
| input voltage to three dc output voltages. The power supply provides
| power for the following:
System board
Channel adapters
Internal diskette drives
Interna! fixed disk drives
Auxiliary device
Keyboard.
|
|
|
|
|
|
| The power switch and one light-emitting diode (LED) is on the front of
| the system unit. The power supply is operating when the LED is lit.
| Outputs
| The power supply provides separate voltage sources for the system
| board and the drives. The system-board voltages are +5 Vdc, +12
| Vdc, and —12 Vdc. The drive voltages are +5 Vdc and +12 Vdc. The
| following is a list of the approximate power provided for system
| components.
Maximum Current
| | System Component +12 Vdc +5 Vde
| | Auxiliary Device None 300 mA
| | Keyboard None 275 mA
|
|
Figure 1-9. Component Maximum Current
| The foliowing are the load currents allowed for each Micro Channel
| connector.
| Supply Voltage Maximum Current
| + 5.0 Vde 1.6A
| +12.0 Vde 0.175 A
| —12.0 Vdc 0.040 A
|
|
Figure 1-10. Channel Load Current
| The formulas used to determine the power requirements and the
| voltage regulation tolerances are in the Micro Channel adapter
| design information in the Hardware Interface Technical Reference -
| Architectures manual.
Model 50 System Overview — October 1990 1-11