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LT3754
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = V OUT = 6V, R ISET = 14.7k unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Voltage Gain (LED)
45
V/V
V C Source Current (Out of Pin)
V C Sink Current (OVP)
V C Sink Current (LED)
V C Output High (clamp) (V COH )
V C Output Low (clamp) (V COL )
V C Switching Threshold (V CSW )
V C = 1.5V, V LEDx = 0.8V, OVP SET = 1.5V
V C = 1.5V, V LEDx = 0.8V, OVP SET = 0V
V C = 1.5V, V LEDx = 1.2V, OVP SET = 1.5V
10
15
9
2.3
0.8
1.1
μA
μA
μA
V
V
V
SENSE AMP
SENSE Input Current (Out of Pin)
SENSE = 0V
65
μA
SENSE Current Limit Threshold
Current Mode Gain
SENSE Over Current Limit Threshold
?V(V C )/?V(SENSE)
l
l
46
90
52
6
100
60
110
mV
V/V
mV
LED CURRENT / CONTROL
I SET Pin Voltage
CTRL = 1.5V
1.00
V
LEDx Current (20mA) (R ISET = 14.7k)
LEDx Current Matching (20mA) (R ISET = 14.7k)
LEDx Current (50mA) (R ISET = 5.76k)
V LEDx = 1V, CTRL = 1.5V
V LEDx = 1V, CTRL = 1.5V
V LEDx = 1V, CTRL = 1.5V
l
19.29
47.85
20.2
±0.7
50.1
21.11
±2.8
52.35
mA
%
mA
LED Pin Regulation Voltage
T SET Threshold
ANALOG DIMMING
1.1
630
V
mV
CTRL Input Current (Out of Pin)
LEDx Current (Dimming 25:1)
CTRL = 1V
CTRL = 0.04V
V LEDx = 1V, CTRL = 0.04V
40
50
0.8
200
200
nA
nA
mA
PWM DIMMING
PWM Input Low Threshold
0.7
1
V
PWM Input High Threshold
1.1
1.4
V
PWM Input Current
V OUT Pin Current in PWM Mode V(V OUT ) = 60V
PWM = 1.5V
PWM = 6V
PWM = 1.5V
PWM = 0V
6
24
370
20
μA
μA
μA
μA
LEDx Leakage Current
(PWM = 0V)
V LEDx = 1V, V OUT = 12V
V LEDx = 50V, V OUT = 60V
0.1
0.1
1
2
μA
μA
FAULT DIAGNOSTICS
FAULT Output Sink Current
LED x Short Threshold (V SH )
(V OUT – V LEDx )
LED Open Detection Threshold
LED1 = Open, V FAULT = 0.3V
V OUT = 12V
V OUT = 60V
V OUT = 12V
0.3
0.6
6
6
0.5
mA
V
V
V
3754fc
4
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