Rainbow-electronics MAX8759 Manual de usuario Pagina 9

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MAX8759
Low-Cost, SMBus, CCFL Backlight Controller
_______________________________________________________________________________________ 9
0
20
60
40
80
100
00.40.2 0.6 0.8 1.0
NORMALIZED BRIGHTNESS
vs. SMBus BRIGHTNESS AND PWMI DUTY CYCLE
MAX8759 toc19
PWMI DUTY RATIO
NORMALIZED BRIGHTNESS (%)
SMB = 0xFF
SMB = 0x80
0
0.2
0.6
0.4
0.8
1.0
00.40.2 0.6 0.8 1.0
NORMALIZED BRIGHTNESS
vs. ALS VOLTAGE AND PWMI DUTY CYCLE
MAX8759 toc20
PWMI DUTY RATIO
V
ALS
= 1.8V
V
ALS
= 1.8V
V
ALS
= 0.8V
B
A
ALS TRANSIENT RESPONSE
(ALSDEL1 = ALSDEL0 = 0)
MAX8759 toc21
A: ALS, 1V/div B: COMP, 1V/div
1s/div
5.30
5.31
5.33
5.32
5.34
5.35
V
CC
LINE REGULATION
MAX8759 toc22
INPUT VOLTAGE (V)
V
CC
VOLTAGE (V)
81612 20 24
5.30
5.31
5.33
5.32
5.34
5.35
042681012
V
CC
LOAD REGULATION
MAX8759 toc23
LOAD CURRENT (mA)
V
CC
VOLTAGE (V)
V
IN
= 24V
V
IN
= 12V
5.27
5.28
5.30
5.29
5.31
5.32
-40 0-20 20 406080
V
CC
VOLTAGE
vs. TEMPERATURE
MAX8759 toc24
TEMPERATURE (°C)
V
CC
VOLTAGE (V)
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 12V, V
CC
= V
DD
, T
A
= +25°C, unless otherwise noted.)
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