Acer 270 manual I − p, I p, Irms, Electrical Characteristics, I rms, Ip − I −p

3. Automatic brightness compensation for input voltage variation.

Electrical Characteristics

No	Parameter	Symbol	Min.	Typ.	Max.	Unit	Comment
.
1	Input	NV_PWR	9	14.8	21	V
	voltage
2	Input	Iin	--	0.33	--	A
	current
3	Lamp	IL	2.7	--	6.3	mA	*Note 1
	current
4	Frequency	F	45	55	65	KHz	* Note 2
5	Output	Pout	--	--	4.5	W
	power
6	Efficiency	η	80%	--	--	--
7	Starting	Vs	1600	--	---	V	At 0’C
	voltage
8	Starting	Tvs	1	--	1.5	Sec
	time
9	Dispoff#		2.8	3.3	3.6	V	Backlight on/off signal
			0	0.5	0.8	V	Low level
10	Limited	DAC-	0		3.3	V	*Note 1
	lamp	BRIG
	maximum
	current
11	PWM	INV_PW	142	150	158	Hz	PWM signal frequency
	signal	M
	*Note 4		3.0	3.3	3.6	V	PWM signal amplitude
			30	--	100	%
							Duty	Ton
								= ------------------
								Period
12	Lamp	I zero-PK	--	--	10	%	Line transient (10.8V to
	current						21V/100us) and turn on
	over-shoot						transient
13	Current		1.27		1.56	Multiple	I − p
	Waveform	I p		2
	factor						I rms
								*10
		I rms					or
14	Unbalance		-10%	0	+10%	Mulitple
	Rate	Ip −I−p
		Irms
15	Turn off	Voff	--	--	100Vp-	V	PWM=40%
	voltage				P
16	Voltage	Trise	--	--	300us	us	PWM=40%
	Rise time
17	Voltage fall	Tfall	--	--	300us	us	PWM=40%
	time

NOTE: Please pay attention to the fellowing:

*1. Limited lamp maximum current by DAC_BRIC signal:

Chapter 1 31