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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 = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INPUT LEAKAGE
PWMI Leakage Current
ISET, FSET Leakage Current
OV Leakage Current
SDA, SCL Input Bias Current
SDA Output Low Sink Current
OSC Leakage Current
T A = +25°C
ISET, FSET to V CC , T A = +25 ° C
T A = +25 ° C
T A = +25 ° C
V SDA = 0.4V
T A = +25 ° C
-0.3
-0.1
-1
4
-3
+0.3
+1
+0.1
+1
+3
μA
μA
μA
μA
mA
μA
LED CURRENT
ISET = V CC
24.5
25.0
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
FB_ Leakage Current
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 (COUT = 1μF, OSC = V CC ) (Note 1)
V FB_ = 50mV (includes 10
sense resistor)
V FB_ = 26V, T A = +25°C
V FB_ = 45V, T A = +25°C
28.8
19.3
14.4
V CC -
0.4
1.166
-1.5
475
575
380
285
30.0
20.0
15.0
1.236
625
750
500
375
120
17.5
2.5
31.2
20.7
15.6
1.306
+1.5
910
1100
740
560
200
28.4
1
4
mA
V
V
%
mV
mV P-P
μA
FAULT PROTECTION
OV Threshold Voltage
FB_ Overvoltage Threshold
FB_ Undervoltage Threshold
Boost Global Fail
Thermal-Shutdown Threshold
Overcurrent FAULT
Shutdown Timer
FB_ Overvoltage Fault Timer
Rising edge, typical hysteresis = 60mV
(Note 1)
I PEAK > 3.3A at duty = 0% or 1.8A at duty = 90%
(typical)
1.166
5.2
130
48
88
1.7
1.236
5.6
175
84
160
128
2
1.306
6.0
220
120
168
2.3
V
V
mV
mV
°C
μs
ms
_______________________________________________________________________________________
3
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