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Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. V IN = 12V, V SHDN = V IN , CCV = 0.1μF, T A = -40°C to +85°C , unless otherwise noted.) (Note 2)
PARAMETER
IN Input Voltage Range
IN Quiescent Current
CONDITIONS
V IN = V CC
V CC bypassed to GND through 1μF cap
V IN = 26V
V SHDN = high
V IN = V CC = 5V
MIN
4.5
5.5
TYP
MAX
5.5
26.0
2
2
UNITS
V
mA
SHDN = GND
10
μA
V CC Output Voltage
V CC Short-Circuit Current
V CC UVLO Threshold
V SHDN = 5V, 6V < V IN < 26V, 0 < I VCC < 10mA
Rising edge, hysteresis = 20mV
4.7
12
4.00
5.3
130
4.45
V
mA
V
STEP-UP CONVERTER
EXT High Level
EXT Low Level
EXT On-Resistance
OSC High-Level Threshold
10mA from EXT to GND
-10mA from EXT to V CC
EXT high or low
V CC -
0.1
V CC -
0.4
0.1
5
V
V
Ω
V
OSC Midlevel Threshold
OSC Low-Level Threshold
V OSC = V CC
1.5
0.9
V CC -
2.0
0.4
1.1
V
V
MHz
Operating Frequency
Maximum Duty Cycle
CS Trip Voltage
V OSC = open
V OSC = GND
Duty cycle = 75%
675
450
94
85
825
550
115
kHz
%
mV
CONTROL INPUT
SHDN Logic-Input High Level
SHDN Logic-Input Low Level
BRT, ENA Logic-Input High Level
BRT, ENA Logic-Input Low Level
INPUT LEAKAGE
2.1
2.1
0.8
0.8
V
V
V
V
SHDN Leakage Current
CS Leakage Current
OSC Leakage Current
BRT, ENA Leakage Current
SHDN = 26V
V CS = GND
-3
-1
+35
+50
+3
+1
μA
μA
μA
μA
FSET, ISET Leakage Current
OV Leakage Current
FSET = ISET = V CC
-1
-0.1
+1
+0.1
μA
μA
4
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