Dc-Dc Converter; Description; Features; Electrical Specification - Compal JHT01 Service Manual

3.

DC-DC CONVERTER

3.1

Description

The DC-DC converter is designed to supply the power for JHT01 series notebook
computer of Compal. It supply +5VALWP, +3VALWP, +1.8VP, +1.5VP,
+1.05VSP, +0.9VSP for logical system, + CPU_CORE for CPU and supplies for
the built-in KB926 microprocessor which handles the keyboard and PMU control
functions of the system. The power ON/OFF is controlled by KB926. There is
also a built-in charger power source. It can charge battery pack whether the
computer is ON or OFF.
3.2

Features

• High efficiency, up to 85% (using battery)
• Accept wide range DC input voltage from 8V to 19V
• Built-in charger power source
• The power ON/OFF is controlled by software
3.3

Electrical specification

Input Voltage/Current
• 8V to19V at the summing point of AC-DC and battery
• INPUT Current 10.8A max from 9-cell battery
• INPUT Current 9.6A max from 6-cell battery
• 3.42A max from 65W AC-DC Adapter.
3.4

Temperature Range:

• Operating temperature: 0°C to 40°C
• Storage temperature range: -20°C to 65°C DC/DC OUTPUT
• Fixed output voltage/Current
Item
Nominal voltage
Min. current
Max. current
Peak current
+5VALWP +CPU_CORE
+5V depend on VID
0A 0A
4.9A 36A
7A 44A
JHT01 Service Manual
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