Component Maximum Current; Channel Load Current - IBM Personal System/2 65 SX 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 DASD drives
Auxiliary device
Keyboard.
|
|
|
|
| The power switch and two light-emitting diodes (LEDs) are on the
| front of the system unit. The green LED indicates that the power
| supply is operating. The yellow LED indicates fixed disk drive
| activity.
| Outputs
| The power supply provides separate voltage sources for the system
| board and the drives. The system-board voltages are +5 Vdc, +12
| Vde, and —12 Vde. The drive voltages are +5 Vdc and +12 Vdc. The
| following is a list of the power provided for each of the components.
| Maximum Current
| | System Component +12 Vde +5 Vdc
| | Internal Fixed Disk Drives 2.5A 1.5A
| | (per power supply connector)
| | Auxiliary Device None 300 mA
| | Keyboard None 275 mA
|
|
Figure 1-6. Component Maximum Current
| The foliowing are the load currents allowed for each channel
| connector.
| Supply Voitage Maximum Current
| + 5.0 Vde 16A
+12.0 Vde 0.175 A
~—12.0 Vde 0.040 A
|
| Figure 1-7. Channel Load Current
| The formulas used to determine the power requirements and the
| voltage regulation tolerances are in the Micro Channel adapter
Model 65 System Overview — October 1990 1-9