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28 Chapter 1
LCD Inverter Specification
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.
Cell voltage 3.7V/cell
Number of battery cell 8
Package configuration Pin 1: BATT+: Battery positive power pin
Pin 2: N/A
Pin 3: B/I: Enable Li-ion battery output, connect to 1k
resistor to GND in system.
Pin 4: TS: Detector Battery
Pin 5: EC_SMD1: N/A
Pin 6: EC_SMC1: SMbus CLOCK
Pin 7: GND> EC_SMD1=SMbus DATA
Package voltag Pin8: GND> Battery Ground Power Pin
No. Supplier Model Type
1 CMO NI54I1-L02 15.4” WXGA
2 LG LP154W01-A3 15.4”WXGA
3 Samsung LTN154X1-L02 15.4” WXGA
4 LG LP154W02-A1 15.4”WSXGA+
Battery
Item Specification
Ω