LT3754 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LT3754 Datasheet PDF : 30 Pages
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LT3754
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT = 6V, RISET = 14.7k unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Voltage Gain (LED)
45
V/V
VC Source Current (Out of Pin)
VC Sink Current (OVP)
VC Sink Current (LED)
VC Output High (clamp) (VCOH)
VC = 1.5V, VLEDx = 0.8V, OVPSET = 1.5V
VC = 1.5V, VLEDx = 0.8V, OVPSET = 0V
VC = 1.5V, VLEDx = 1.2V, OVPSET = 1.5V
10
µA
15
µA
9
µA
2.3
V
VC Output Low (clamp) (VCOL)
0.8
V
VC Switching Threshold (VCSW)
SENSE AMP
1.1
V
SENSE Input Current (Out of Pin)
SENSE = 0V
65
µA
SENSE Current Limit Threshold
l 46
52
60
mV
Current Mode Gain
SENSE Over Current Limit Threshold
∆V(VC)/∆V(SENSE)
6
V/V
l 90
100
110
mV
LED CURRENT / CONTROL
ISET Pin Voltage
CTRL = 1.5V
1.00
V
LEDx Current (20mA) (RISET = 14.7k)
VLEDx = 1V, CTRL = 1.5V
19.29 20.2 21.11
mA
LEDx Current Matching (20mA) (RISET = 14.7k)
LEDx Current (50mA) (RISET = 5.76k)
LED Pin Regulation Voltage
VLEDx = 1V, CTRL = 1.5V
VLEDx = 1V, CTRL = 1.5V
l
±0.7 ±2.8
%
47.85 50.1 52.35
mA
1.1
V
TSET Threshold
630
mV
ANALOG DIMMING
CTRL Input Current (Out of Pin)
CTRL = 1V
CTRL = 0.04V
40
200
nA
50
200
nA
LEDx Current (Dimming 25:1)
PWM DIMMING
VLEDx = 1V, CTRL = 0.04V
0.8
mA
PWM Input Low Threshold
0.7
1
V
PWM Input High Threshold
1.1
1.4
V
PWM Input Current
PWM = 1.5V
PWM = 6V
6
µA
24
µA
VOUT Pin Current in PWM Mode V(VOUT) = 60V
PWM = 1.5V
PWM = 0V
370
µA
20
µA
LEDx Leakage Current
(PWM = 0V)
FAULT DIAGNOSTICS
VLEDx = 1V, VOUT = 12V
VLEDx = 50V, VOUT = 60V
0.1
1
µA
0.1
2
µA
FAULT Output Sink Current
LEDx Short Threshold (VSH)
(VOUT – VLEDx)
LED Open Detection Threshold
LED1 = Open, VFAULT = 0.3V
VOUT = 12V
VOUT = 60V
VOUT = 12V
0.3
0.6
mA
6
V
6
V
0.5
V
3754fc
4
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