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Chapter 1 26
NOTE: DC-AC inverter is used to generate very high AC voltage, then support to LCD CCFT backlight user,
and is also responsible for the control of LCD brightness. Avoid touching the DC-AC inverter area while
the system unit is turned on.
NOTE: There is an EEPROM in the inverter, which stores its supported LCD type and ID code. If you replace
a new inverter or replace the LCD with a different brand, use Inverter ID utility to update the ID
information.
.
Normal charge (charge while system
is not operative)
2.8A 2.25V
Background charge (charge even
system is still operative)
0.8A
Battery-low 2 level (V) 12.5V 8V
Battery-low 3 level (V) 10V 7.5V
Protection
Charger protection Over Current Protection
DC/DC converter protection OCP (Over Current Protection, A)
OVP (Over Voltage Protection, V)
UVP (Under Voltage Protection, V)
DC-AC LCD Inverter
Item Specification
Vendor & model name Ambit
Input voltage (V) 8 ~ 21V
Input current (mA) 1A (max.)
Output voltage
(Vrms, no load)
1400Vrms
Output voltage
frequency (kHz)
40 ~ 70KHz
Output Current/Lamp 5.5 mA ~ 6.5mA
LCD
Item Specification
Vendor & model name 14.1” AU
B141XN04 V2
15” Hitachi
TX38D85VC1CAB
Mechanical Specifications
LCD display area (diagonal, inch) 14.1 15
Display technology TFT TFT
Resolution XGA (1024x768) XGA (1024x768)
Support colors 262K 262K
Optical Specification
Brightness control Keyboard hotkey Keyboard hotkey
Contrast control None None
Electrical Specification
Supply voltage for LCD display (V) 3.3 (typ.) 3.3 (typ.)
Supply voltage for LCD backlight (Vrms) 650 (typ.) 650 (typ.)
DC-DC/Charger Converter
Item Specification