Rainbow-electronics MAX8709 Manual do Utilizador Página 7

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MAX8709
High-Efficiency CCFL Backlight
Controller with SMBus Interface
_______________________________________________________________________________________ 7
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX8709 toc10
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
2219161310
50
54
58
62
46
725
DPWM FREQUENCY
vs. INPUT VOLTAGE
MAX8709 toc11
INPUT VOLTAGE (V)
DPWM FREQUENCY (Hz)
2219161310
205
210
215
220
200
725
ELECTRICAL EFFICIENCY
vs. INPUT VOLTAGE
MAX8709 toc12
INPUT VOLTAGE (V)
ELECTRICAL EFFICIENCY (%)
2219161310
60
70
80
90
100
50
725
NORMALIZED RMS LAMP CURRENT
vs. INPUT VOLTAGE
MAX8709 toc13
INPUT VOLTAGE (V)
RMS LAMP-CURRENT ERROR (%)
221910 13 16
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
-0.8
725
-0.15
-0.10
0
-0.05
0.05
0.10
04020 60 80 100
REF LOAD REGULATION
MAX8709 toc14
REF LOAD CURRENT (µA)
REF VOLTAGE ERROR (%)
0
20
60
40
80
100
081241620242832
NORMALIZED BRIGHTNESS
vs. BRIGHTNESS CODE
MAX8709 toc15
BRIGHTNESS CODE
NORMALIZED BRIGHTNESS (%)
NORMALIZED V
CC
LINE REGULATION
MAX8709 toc16
INPUT VOLTAGE (V)
V
CC
VOLTAGE ERROR (%)
201510
-0.8
-0.6
-0.4
-0.2
0
0.2
-1.0
525
V
CC
= 5.3V
V
CC
LOAD REGULATION
MAX8709 toc17
V
CC
VOLTAGE ERROR (%)
161284
-1.2
-0.9
-0.6
-0.3
0
-1.5
020
EXTERNAL LOAD CURRENT (mA)
Typical Operating Characteristics (continued)
(Circuit of Figure 1. V
BATT
= 12V, V
LOT
= V
REF
, V
CC
= V
DD,
V
SUS
= 5.3V, T
A
= +25°C, unless otherwise noted.)
REF OUTPUT vs. TEMPERATURE
MAX8709 toc18
TEMPERATURE (°C)
REF VOLTAGE ERROR (%)
806040200-20
-0.20
-0.15
-0.10
-0.05
0
0.05
-0.25
-40 100
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