6 CONVERTER SPECIFICATION
6.1 ABSOLUTE MAXIMUM RATINGS
Symbol
Ratings
LED_VCCS
29.0V
LED_GND
+/-0.3V
LED_PWM, LED_EN
-0.3V~70V
Doc No.: 44087312
Issued Date: Oct, 20, 2008
Model No.: N140B6 -L02
Approval
6.2 RECOMMENDED OPERATING RATINGS
Parameter
Symbol Min.
Value
Typ.
Max.
Unit
Note
Converter Input power supply voltage
LED_Vccs 6.0
12.0
21.0
V
EN Control Level
Backlight on
Backlight off
2.0
---
5.5
V
0
---
0.8
V
PWM Control Level
PWM High Level
PWM Low Level
2.0
---
5.5
V
0
---
0.8
V
PWM Control Duty Ratio
20
100
%
PWM Control Permissive Ripple Voltage
VPWM_pp
100
mV
PWM Control Frequency
fPWM
190
210
230
Hz
LED_VCCS=Min
602
693
mA
(1)
Converter Input Current LED_VCCS=Typ
IBL
301
347
mA
(1)
LED_VCCS=Max
172
198
mA
(1)
Note (1) The specified LED power supply current is under the conditions at “LED_VCCS = Min, Typ, Max”,
Ta = 25 ± 2 ºC, fPWM = 200 Hz, Duty=100%.
6.3 LED BACKLIGHT CONTROLL POWER SEQUENCE
Power On
Power Off
LED_VCCS
0V
LED_PWM
0V
TA
TB
LED_EN 0V
Timing Specifications:
TC
TD
TA ≧ 0ms
TB ≧ 0ms
TC≧ 0ms
TD≧ 0ms
Note (1) Please follow the LED backlight power sequence as above. If the customer could not follow, it might cause
backlight flash issue during display ON/OFF or damage the LED backlight controller
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Version 2.0