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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 = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INPUT LEAKAGE
SHDN Leakage Current
SHDN = 26V
+42
μA
CS Leakage Current
OSC Leakage Current
BRT, ENA Leakage Current
FSET, ISET Leakage Current
OV Leakage Current
V CS = GND
FSET = ISET = V CC
-3
-1
-1
-0.1
+40
+50
+3
+1
+1
+0.1
μA
μA
μA
μA
μA
LED CURRENT
ISET = V CC , BRT = 100%
19.40
20.00
20.60
Full-Scale FB_ Output Current
R ISET = 80k
R ISET = 133k
to GND, BRT = 100%
to GND, BRT = 100%
24.25
14.40
25.00
15.00
25.75
15.60
mA
ISET High-Level Threshold
Default setting for 20mA full-scale LED current
V CC -
0.4
V
ISET Voltage
1.12
1.19
1.26
V
20% Output Current
Current Regulation Between
Strings
Minimum FB_ Regulation
Voltage
Maximum FB_ Ripple
FB_ On-Resistance
FB_ Leakage Current
ISET = V CC , BRT = 20%
ISET = V CC , BRT = 100%
ISET = V CC , BRT = 20%
R ISET = 80k to GND, BRT = 100%
ISET = V CC , BRT = 100%
ISET = V CC , 12.5%
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
3.84
-1.5
-2.0
300
270
150
4.00
500
450
275
120
13
10
4.16
+1.5
+2.0
800
720
500
200
20
1
28
mA
%
%
mV
mV P-P
μA
BRT Input Frequency
Minimum BRT Duty Cycle
PLL active
100
12.5
500
Hz
%
FAULT PROTECTION
OV Threshold Voltage
FB_ Overvoltage Threshold
1.16
V CC +
0.20
1.23
V CC +
0.6
1.30
V CC +
1.45
V
V
FAULT Shutdown Timer
Thermal-Shutdown Threshold
V FB_ > 5.6V (typ)
(Note 1)
50
65
170
80
ms
°C
PHASE-LOCKED LOOP
FSET High-Level Threshold
PLL disabled
V CC -
0.4
V
BRT Frequency Capture Range
R FSET = 500k
R FSET = 250k
150
300
200
400
250
500
Hz
_______________________________________________________________________________________
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