Acer 1800 manual Electrical Characteristics

Electrical Characteristics

No	Item		Symbol			Min.	Typ.	Max.	Unit		Comment
.
1	Input voltage	INV_PWR				10	16	20	V	Note 1
2	Input current	Iin				--	0.33	--	A
3	Lamp current	IL				3.3	--	6.8	mA	DAC=0V
										*Note 2
4	Lamp current	IL				2.7	--	6.3	mA	DAC= 0.5V
4	Frequency	F				50	60	70	KHz	* Note 3
5	Output power	Pout				--	--	4.8	W	When two lamps total
										9.6W
6	Efficiency	η				76%	--	--	--
7	Starting	Vs				1600	--	---	V	At 0 ° ’C
	voltage
8	Starting time	Tvs				1	--	1.5	Sec
9	Dispoff#					2.8	3.3	3.6	V	Backlight on/off signal
						0	0.5	0.8	V	Low level
10	Limited lamp	DAC-				0		3.3	V	*Note 2
	maximum	BRIG
	current
11	PWM signal	INV_PWM				142	150	158	Hz	PWM signal frequency
	*Note 4
						3.0	3.3	3.6	V	PWM signal amplitude
						30	--	100	%
											Duty	Ton
												= ------------------
												Period
12	Lamp current	I zero-PK				--	--	20	%	Line transient (10.8V to
	over-shoot									21V/100us) and turn
										on transient
13	Current					1.27		1.56	Multipl		I − p
	Waveform			I p			2		e
	factor									or	I rms	*10
				Irms
14	Unbalance					-15%	0	+15%	Mulitpl
	Rate		Ip −		I−p				e
				Irms
15	Turn off	IHL				--	--	0	A	PWM=40%
	current (Hight
	side)
16	Turn off	Voff				--	--	150Vp	V	PWM=40%
	voltage							-p
17	Voltage Rise	Trise				--	--	300us	us	PWM=40%
	time
18	Voltage fall	Tfall				--	--	300us	us	PWM=40%
	time
19	Lamp current	L bal					±0.5mA			PWM=40~100%
	balance

28 Chapter 1