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30 Chapter 1
There are two control signals that come form system to control lamp brightness. One signal is
named DAC_BRIG, which limits current to meet LCD lamp current specification. Another one is
named PWM, which adjusts lamp brightness. This inverter brightness is adjusted by PWM burst
mode. The PWM burst mode is that turning on and off the lamp at rate of 150Hz. The effective
brightness is a function of the duty cycle.
Features
1. Wide range 9V to 21V input voltage.
2. Birghtness adjustment by PWM duty mode.
Battery
Item Specification
Vendor & model name Panasonic
Battery Type Li-ion
Pack capacity 57Wh
Cell voltage 3.7V/cell
Number of battery cell 8
Package configuration 4 cells in series, 2 series in parallel
Package voltage 14.8V
LCD Inverter Specification
This inverter is designed to light up the CCFL of LCD for TravelMate 270 series notebook. It should be
supported the following LCD panels.
No. Supplier Model Type
1 LG LP150x04 TFT, 15.0” XGA
2 Hitachi TX38D85 TFT, 15.0” XGA
3 CPT CLAA14/XF01 TFT, 14.1” XGA
4 CPT CLAA150PA01 TFT, 15.0” SXGA+
5 LG LP150E0/-A2M2 TFT, 15.0” SXGA+
6 IBM ITSX95C TFT 15.0” XGA