Acer 290E manual Electrical specification, Thermal, Dacbrig 0 V, PWM

No	Parameter	Symbol	Min.	Typ.	Max.	Unit	Comment
.
16	Voltage	Trise	--	--	300us	us	PWM=30%
	Rise time
	(Low side)
17	Voltage fall	Tfall	--	--	300us	us	PWM=30%
	time (Low
	side)

NOTE:

*1. The inverter can work in 7.5V input voltage (continuous), but 7.5V electronic characteristic will not be care.

*2. Limited lamp maximum current by DAC_BRIC signal:

When DAC_BRIG voltage is 0V and INV_PWM enables (100%), lamp has max. current. When DAC_BRIG voltage is 3.3V and INV_PWM enables (100%), lamp has min. current. When add 1V DAC, the 100% Lamp current will decrease 0.5mA.

DAC_BRIG signal comes from system chipset with internal resistance of 3K Ω

*3. Inverter operating frequency should be within specification (45~65kHz) at max. and min. brightness load.

*4. INV_PWM enable implies INV_PWM signal is High level (On duty cycle is 100%). It is a square wave of 150Hz to adjust backlight brightness that is a function of PWM duty cycle. Backlight brightness is maximum value under INV_PWM at 100% and brightness is minimum under INV_PWM at 30%.

*5.The system interface signals belong to 3.3V.

*6. Please make sure open lamp output voltage should be within starting voltage specification.

*7. Inverter should pass human body safety test.

*8. Inverter should be no smoking by any component open/short test.

*9. Transformer voltage stress should not be over 85% under any condition. (turn on overshoot transient and line transient.)

*10. Audio noise should be less than 36dB at 10cm distance.

.

Electrical specification

	No	Symbol	Min.	Typ.	Max.	Unit	Comment
	.
	1	V oper*	--	650	--	Vrms	Lamp operating voltage
							(650+/-50)
		Il	6.2	6.5	6.8	mArms	DAC_BRIG: 0 V, PWM:
							100%
		Il	3.0	3.3	3.6	mArms	DAC_BRIG: 0 V,
							PWM:30%
		Il	5.7	6.0	6.3	mArms	DAC_BRIG: 0V,
							PWM:100%
		Il	2.7	3.0	3.3	mArms	DAC_BRIG: 1V,
							PWM:30%
		F	45	55	65	kHz
		η	80%	--	--	--
	Thermal
Chapter 1							29