IBM 770 manual Output Protection, Voltage Sequencing, Power Supply Connector, Battery Pack

Output Protection

A short	circuit placed					on any	dc	output	(between two outputs	or
between	an	output		and		a dc return) latches all dc outputs into a
shutdown	state,		with		no	hazardous condition to the power supply.
If an	overvoltage			fault		occurs	in	the power supply, the power		supply
latches	all	dc	outputs			into a shutdown state before any output
exceeds 135%			of	the	nominal value			of the	power supply.

Voltage Sequencing

When power is turned on, the output voltages reach their operational voltages within 2 seconds.

Power Supply Connector

The following connector is used with the AC adapter. The total power capacity of this connector must not exceed 4.0 A.

Refer to Figure 1-9 for the appropriate adapter pin assignments.

Pin

1

2

Voltage

+7.0 V dc+17to.0 V dc (depending on charging conditions) Ground

Figure 1-9. Voltage Pin Assignments for the 56W AC Adapter

Battery Pack

The ThinkPad computer uses a lithium-ion (Li-ion) battery pack that meets the following electrical specifications:

System Overview 1-11