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8-String White LED Driver with
SMBus for LCD Panel Applications
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V IN = 12V, C CCV = 0.022μF, R CCV = 5.1k Ω , V ISET = V OSC = V DD = V CC , 5V = R FSET = 464k Ω , V PWMI = GND,
T A = -40°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
BOOST CONVERTER
LX On-Resistance
20mA from LX_ to PGND
0.3
V OSC = V CC
0.89
1.10
MHz
Operating Frequency
OSC High-Level Threshold
OSC Midlevel Threshold
OSC Low-Level Threshold
Maximum Duty Cycle
LX Current Limit
V OSC = open
V OSC = GND
Duty cycle = 75% (Note 1)
675
450
V CC -
0.4
1.5
94
1.6
825
560
V CC -
2.0
0.4
97
kHz
V
V
V
%
A
CONTRL INPUT
SDA, SCL Logic Input-High Level
2.1
SDA, SCL Logic Input-Low Level
PWMI Logic Input-High Level
PWMI Logic Input-Low Level
INPUT LEAKAGE
2.1
0.8
0.8
V
V
V
SDA Output Low Sink Current
V SDA = 0.4V
4
mA
LED CURRENT
ISET = V CC
24.5
25.5
Full-Scale FB_ Output Current
ISET High-Level Threshold
ISET Output Voltage
Current Regulation
Between Strings
Minimum FB_ Regulation Voltage
Maximum FB_ Ripple
FB_ On-Resistance
R ISET = 133k
R ISET = 200k
R ISET = 266k
Default setting
ISET = V CC
I FB_ = 25mA
I FB_ = 30mA
I FB_ = 20mA
I FB_ = 15mA
I FB_ = 20mA (C OUT = 1 μF, OSC = V CC ) (Note1)
V FB_ = 50mV (includes 10
sense resistor)
28.6
19.0
14.4
V CC -
0.4
1.166
-1.5
425
575
380
285
31.4
21.0
15.6
1.306
1.5
910
1100
740
560
200
28.4
mA
V
V
%
mV
mV P-P
_______________________________________________________________________________________
5
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