MAX8790 查看數據表（PDF） - Maxim Integrated
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MAX8790
Maxim Integrated
MAX8790 Datasheet PDF : 23 Pages
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MAX8790
Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
Typical Operating Characteristics
(Circuit configuration 1, VIN = 12V, VSHDN = VIN, LEDs = 8 series x 6 parallel strings, ISET = VCC, TA = +25°C, unless otherwise noted.)
BOOST CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (BRT = 100%)
94
93
500kHz
92
91
750kHz
90
89
1MHz
88
87
86
7
12
17
INPUT VOLTAGE (V)
LED CURRENT
vs. AMBIENT TEMPERATURE (BRT = 100%)
21.0
20.8
20.6
20.4
20.2
20.0
19.8
19.6
19.4
19.2
19.0
0
20
40
60
80
AMBIENT TEMPERATURE (°)
SUPPLY CURRENT vs. INPUT VOLTAGE
(DPWM DIMMING)
7
6
5
BRT = 100%
4
3
2
BRT = 0%
1
0
7
12
17
INPUT VOLTAGE (V)
NORMALIZED POWER vs. TOTAL LED CURRENT
(ANALOG AND DPWM DIMMING)
1.2
NORMALIZED TO VIN = 20V, AND ILED = 20mA
VIN = 7V
1.0
0.8
TOTAL INPUT
0.6
POWER, ANALOG
0.4
TOTAL INPUT
POWER, DPWM
TOTAL LED
POWER, DPWM
0.2
0
1
TOTAL LED
POWER, ANALOG
10
100
1000
TOTAL LED CURRENT (mA)
LED CURRENT REGULATION
vs. INPUT VOLTAGE
0.05
0.04
0.03
DPWM DIMMING
0.02
BRT = 10%
0.01
0
-0.01
-0.02
DPWM DIMMING
BRT = 100%
-0.03
ANALOG DIMMING
-0.04
BRT = 10%
-0.05
7
12
17
INPUT VOLTAGE (V)
SHUTDOWN CURRENT vs. INPUT VOLTAGE
7
6
5
4
3
2
1
0
7
12
17
INPUT VOLTAGE (V)
LED CURRENT vs. BRT DUTY CYCLE
(BRT AT 200Hz)
25
IDENTICAL FOR DPWM DIMMING
AND ANALOG DIMMING
20
15
10
5
0
1
10
100
BRT DUTY CYCLE (%)
FB_ VOLTAGE vs. LED CURRENT
(ANALOG DIMMING)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
5 10 15 20 25 30
LED STRING CURRENT (mA)
SWITCHING WAVEFORMS
(BRT = 100%)
MAX8790 toc09
200ns/div
VLX
10V/div
0V
IL
500mA/div
0mA
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