8-String White LED Driver with
SMBus for LCD Panel Applications
Typical Operating Characteristics
(Circuit of Figure 1, V IN = 12V, C CCV = 0.022μF, R CCV = 5.1k Ω , V ISET = V OSC = V DD = V CC , R FSET = 464k Ω , V PWMI = GND, LEDs =
10 series x 4 parallel strings, T A = +25°C, unless otherwise noted.)
BOOST CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (BRIGHTNESS = 100%)
96
95
30
25
LED CURRENT
vs. SMBus BRIGHTNESS SETTING
30
25
LED CURRENT
vs. PWMI DUTY CYCLE
94
93
20
15
20
15
SMBus = 255
SMBus = 128
92
91
90
10
5
0
10
5
0
5
10
15
20
25
0
50
100
150
200
250
0
20
40
60
80
100
INPUT VOLTAGE (V)
SMBus BRIGHTNESS SETTING
PWMI DUTY CYCLE (%)
LED CURRENT vs. AMBIENT TEMPERATURE
(BRIGHTNESS = 100%)
26.0
25.8
30
LED CURRENT
vs. INPUT VOLTAGE
25.6
25.4
25.2
25.0
24.8
24.6
24.4
24.2
24.0
25
20
15
10
5
0
SMBus = 0xFF
SMBus = 0x1F
0
20
40
60
80
5
8
11
14
17
20
5
4
3
2
AMBIENT TEMPERATURE ( ° C)
V CC SUPPLY CURRENT
vs. INPUT VOLTAGE
SMBus = 255
6.00
5.98
5.96
5.94
5.92
5.90
5.88
5.86
INPUT VOLTAGE (V)
V CC SHUTDOWN CURRENT
vs. INPUT VOLTAGE
1
0
SMBus = 0
5.84
5.82
5.80
5
10
15
20
25
5
10
15
20
25
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
7
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