MAX8709B Просмотр технического описания (PDF) - Maxim Integrated
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MAX8709B Datasheet PDF : 24 Pages
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High-Efficiency CCFL Backlight
Controller with SMBus Interface
Typical Operating Characteristics (continued)
(Circuit of Figure 1. VBATT = 12V, VLOT = VREF, VCC = VDD, VSUS = 5.3V, TA = +25°C, unless otherwise noted.)
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
62
DPWM FREQUENCY
vs. INPUT VOLTAGE
220
ELECTRICAL EFFICIENCY
vs. INPUT VOLTAGE
100
90
58
215
80
54
210
70
50
205
60
46
7
10 13 16 19 22 25
INPUT VOLTAGE (V)
200
7
10 13 16 19 22 25
INPUT VOLTAGE (V)
50
7
10 13 16 19 22 25
INPUT VOLTAGE (V)
NORMALIZED RMS LAMP CURRENT
vs. INPUT VOLTAGE
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
7
10 13 16 19 22 25
INPUT VOLTAGE (V)
REF LOAD REGULATION
0.10
0.05
0
-0.05
-0.10
-0.15
0
20
40
60
80 100
REF LOAD CURRENT (μA)
NORMALIZED BRIGHTNESS
vs. BRIGHTNESS CODE
100
80
60
40
20
0
0 4 8 12 16 20 24 28 32
BRIGHTNESS CODE
NORMALIZED VCC LINE REGULATION
0.2
VCC = 5.3V
0
-0.2
-0.4
-0.6
-0.8
-1.0
5
10
15
20
25
INPUT VOLTAGE (V)
VCC LOAD REGULATION
0
-0.3
-0.6
-0.9
-1.2
-1.5
0
4
8
12
16
20
EXTERNAL LOAD CURRENT (mA)
REF OUTPUT vs. TEMPERATURE
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
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