JHT01 Service Manual
4-3
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 +5VALWP +CPU_CORE
Nominal voltage +5V depend on VID
Min. current 0A 0A
Max. current 4.9A 36A
Peak current 7A 44A
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