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Chapter 1 27
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.
3. Close loop controls lamp current.
6 Hitachi TX38D81VC1CAB TFT, 15.0 XGA
7 LG LP150X08-A3 TFT 15.0” XGA
8 Hannstar HSD150PX17-A TFT, 15.0” XGA
LCD Inverter Specification
This inverter is designed to light up the CCFL of LCD for TravelMate 290E series notebook. It should be
supported the following LCD panels.
No. Supplier Model Type