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SC668
Typical Characteristics — Backlights
Backlight Efficiency (8 LEDs)
I IN Supply Current (8 LEDs)
100
η = ( ∑ P LED1-8 )/(V IN × I IN + V A × I A ), I OUT = 8 × I BL , V A = V IN , T A = 25°C
V F = 3.24V
V F = 3.10V
1.5
I OUT = 8 × I BL , V A = V IN , T A = 25°C
I BL = 25 mA, V F = 3.24V
90 I BL = 25mA
I BL = 12mA
80
V F = 2.97V
V F = 2.80V
1.4
1.3
I BL = 12 mA, V F = 3.10V
I BL = 5 mA, V F = 2.97V
I BL = 1 mA, V F = 2.80V
70
I BL = 5mA
1.2
I BL = 0.5 mA, V F = 2.74V
60
I BL = 1mA
I BL = 0.5m A
V F = 2.74V
1.1
50
4.2
3.9
3.6
V IN (V)
3.3
3.0
2.7
1.0
4.2
3.9
V IN (V)
3.6
3.3
3.0
2.7
Dropout Voltage V DO vs I BL (6 LEDs)
80
70
60
50
40
30
20
V DO = V BLn when I BLn has dropped 10% from the target value
T A =25°C
T A =85°C
T A =-40°C
10
0
5
10 15
I BL Setting (mA)
20
25
7
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