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Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
Typical Operating Characteristics
(Circuit configuration 1, V IN = 12V, V SHDN = V IN , LEDs = 8 series x 6 parallel strings, ISET = V CC , T A = +25°C, unless otherwise noted.)
BOOST CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (BRT = 100%)
NORMALIZED POWER vs. TOTAL LED CURRENT
(ANALOG AND DPWM DIMMING)
LED CURRENT vs. BRT DUTY CYCLE
(BRT AT 200Hz)
94
1.2
NORMALIZED TO V IN = 20V, AND I LED = 20mA
25
IDENTICAL FOR DPWM DIMMING
93
92
91
750kHz
500kHz
1.0
0.8
V IN = 7V
TOTAL INPUT
20
15
AND ANALOG DIMMING
90
0.6
POWER, ANALOG
89
88
87
86
1MHz
0.4
0.2
0
TOTAL INPUT
POWER, DPWM
TOTAL LED
POWER, DPWM
TOTAL LED
POWER, ANALOG
10
5
0
7
12 17
1
10 100
1000
1
10
100
INPUT VOLTAGE (V)
LED CURRENT
vs. AMBIENT TEMPERATURE (BRT = 100%)
21.0
20.8
0.05
0.04
TOTAL LED CURRENT (mA)
LED CURRENT REGULATION
vs. INPUT VOLTAGE
0.7
0.6
BRT DUTY CYCLE (%)
FB_ VOLTAGE vs. LED CURRENT
(ANALOG DIMMING)
20.6
20.4
20.2
20.0
19.8
19.6
19.4
19.2
19.0
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.05
DPWM DIMMING
BRT = 10%
DPWM DIMMING
BRT = 100%
ANALOG DIMMING
BRT = 10%
0.5
0.4
0.3
0.2
0.1
0
0
20
40
60
80
7
12 17
0
5
10 15 20 25
30
7
6
AMBIENT TEMPERATURE ( ° )
SUPPLY CURRENT vs. INPUT VOLTAGE
(DPWM DIMMING)
INPUT VOLTAGE (V)
SHUTDOWN CURRENT vs. INPUT VOLTAGE
7
6
LED STRING CURRENT (mA)
SWITCHING WAVEFORMS
(BRT = 100%)
MAX8790A toc09
5
4
BRT = 100%
5
4
V LX
10V/div
0V
3
3
2
BRT = 0%
2
I L
500mA/div
1
0
1
0
0mA
7
12 17
7
12 17
200ns/div
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
6
_______________________________________________________________________________________
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