IBM PC 100, Technical Manual

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Chapter 1. System Description
Component Outputs
The power supply provides separate voltage sources for the system board and internal storage devices.
The following figure shows the approximate power that is provided for system components. Many
components draw less current than the maximum shown.
Note: Some adapters and hard disk drives draw more current than the recommended limits. These
adapters and drives can be installed in the system; however, the power supply will shut down if the
total power used exceeds the maximum power that is available.
Output Protection
The power supply protects against output overcurrent, overvoltage, and short circuits. Please see the
power supply specifications for details.
A short circuit that is placed on any dc output (between outputs or between an output and dc return)
latches all dc outputs into a shutdown state, with no damage to the power supply.
If this shutdown state occurs, the power supply returns to normal operation only after the fault has been
removed and the power switch has been turned off for at least one second.
If an overvoltage fault occurs (in the power supply), the power supply latches all dc outputs into a
shutdown state before any output exceeds 130% of the nominal value of the power supply.
Figure 10. Component Maximum Current
Supply Voltage (V dc) Maximum Current (mA) Regulation Limits
System Board:
+
5.0 V dc 4000 mA
+
5.0% to
−
5.0%
+
12.0 V dc 25.0 mA
+
5.0% to
−
5.0%
−
12.0 V dc 25.0 mA
+
10.0% to
−
9.0%
Keyboard Port:
+
5.0 V dc 275 mA
+
5.0% to
−
5.0%
Auxiliary-Device (Mouse) Port:
+
5.0 V dc 300 mA
+
5.0% to
−
5.0%
AT-Bus Adapters (Per Slot):
+
5.0 V dc 4500 mA
+
5.0% to
−
5.0%
−
5.0 V dc 200 mA
+
5.0% to
−
5.0%
+
12.0 V dc 1500 mA
+
5.0% to
−
5.0%
−
12.0 V dc 300 mA
+
5.0% to
−
5.0%
PCI-Bus Adapters (Per Slot)
+
5.0 V dc 5000 mA
+
5.0% to
−
4.0%
Internal DASD:
+
5.0 V dc 1400 mA
+
5.0% to
−
5.0%
+
12.0 V dc 1500 mA
+
5.0% to
−
5.0%
12
Technical Information Manual