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Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
ELECTRICAL CHARACTERISTICS (continued)
(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
CONDITIONS
MIN
TYP
MAX
UNITS
LED CURRENT
ISET = V CC , BRT = 100%
19.2
20.8
Full-Scale FB_ Output Current
ISET High-Level Threshold
ISET Voltage
20% Output Current
Current Regulation Between
Strings
Minimum FB_ Regulation Voltage
R ISET = 80k Ω to GND, BRT = 100%
R ISET = 133k Ω to GND, BRT = 100%
Default setting for 20mA full-scale LED current
ISET = V CC , BRT = 20%
ISET = V CC , BRT = 100%
ISET = V CC , BRT = 20%
R ISET = 80k Ω to GND, BRT = 100%
ISET= V CC , BRT = 100%
ISET = V CC , BRT = 12.5%
24.0
14.4
V CC -
0.4
1.12
3.8
-2
-3
280
250
140
26.0
15.6
1.26
4.2
+2
+3
840
760
530
mA
V
V
mA
%
mV
Maximum FB_ Ripple
FB_ On-Resistance
FB_ Leakage Current
BRT Input Frequency
ISET= V CC , C OUT = 1μF, OSC = V CC (Note 1)
V FB_ = 50mV
SHDN = GND, V FB_ = 26V
SHDN = V IN , BRT = GND, V FB_ = 15V
100
200
20
1
28
500
mV P-P
Ω
μA
Hz
FAULT PROTECTION
OV Threshold Voltage
FB_ Overvoltage Threshold
1.16
V CC +
0.2
1.30
V CC +
1.45
V
V
FAULT Shutdown Timer
V FB_ > 5.6V (typ)
50
80
ms
PHASE-LOCKED LOOP
FSET High-Level Threshold
PLL disabled
V CC -
0.4
V
BRT Frequency Capture Range
R FSET = 500k Ω
R FSET = 250k Ω
150
300
250
500
Hz
Hz
Note 1: Specifications are guaranteed by design, not production tested.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
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5
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