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DC/DC Converter Board
The Notebook PC has a built-in DC/DC converter module which provides all the DC
voltage outputs required by the system. This module will have the following features:
A. Input requirements :
- Voltage input from AC adapter : 20.0V
- Voltage input from battery : 12.0V (Ni-MH), or 10.8V (Li-Ion)
B. Output Requirements :
Voltage Regulation Ripple & Noise Current Peak Current Min.
+5V -4% ~ +2% 100mV P-P 3.0A 0.5A
+3.3V -4% ~ +2% 100mV P-P 5.0A 0.5A
+12V -5% ~ +5% 200mV P-P 400mA 0.1A
C. Efficiency :
The total efficiency is 85% minimum at full load condition.
D. Function of Battery charge
FUNCTIONS Charge Current Charge Time
System Power On/Off 1.3A
±
10% 3 Hours
Battery Full (trickle charge) 0.02A --
E. Battery Protection and indication
- The discharge circuit should be shut down when the battery voltage down to
8.5V max.
- The battery low signal active low when the battery voltage down to NI-MH 11V
(±0.2V), or Li-ION 10V (±0.1V).
F. The power on/off switch in the LED board
G. Protection requirement :
- Input fuse protection : 5A
- Output short circuit protection : +5V, +3.3V, +3.1V, +2.9V, +2.8V, +2.5V and
+12V