Ibm Portable Personal Computer Power Supply; Description; Voltage And Current Requirements - IBM XT 5160 Technical Reference

IBM Portable Personal Computer Power
Supply
Description
The system unit's power supply is a 114-watt, switching regulator
that provides five outputs. It supplies power for the system unit
and its options, the power supply fan, the diskette drive, the
composite display, and the keyboard. All power levels are
protected against overvoltage and overcurrent conditions. The
input voltage selector switch has 115 Vac and 230 Vac positions.
If a dc overload or overvoltage condition exists, the power supply
automatically shuts down until the condition is corrected, and the
power supply is switched off and then on.
The internal 5-1/4 inch diskette drive uses the
+
5 Vdc and the
+
12 Vdc power levels. Both the
+
12 Vdc and -12 Vdc power
levels are used in the drivers and receivers of the optional
communications adapters. The display uses a separate
+
12 Vdc
power level. The
+
5 Vdc, -5 Vdc,
+
12 Vdc, and -12 Vdc power
levels are bussed across the system expansion slots.
Voltage and Current Requirements
Voltage
@
50/60 Hz
±
3 Hz
Nominal Vac Minimum Vac Maximum Vac
110
90 137
220/240 180
259
Current: 3.5 A max at 90 Vac
Note: Input voltage to be 50 or 60 hertz,
±
3 hertz.
Power Supplies 3-7