Datasheet

LT3760
4
3760fc
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Voltage Gain (LED) 45 V/V
V
C
Source Current (Out of Pin) V
C
= 1.5V, V
LEDx
= 0.8V, OVP
SET
= 1.5V 10 µA
V
C
Sink Current (OVP) V
C
= 1.5V, V
LEDx
= 0.8V, OVP
SET
= 0V 15 µA
V
C
Sink Current (LED) V
C
= 1.5V, V
LEDx
= 1.2V, OVP
SET
= 1.5V 9 µA
V
C
Output High (clamp) (V
COH
) 2.3 V
V
C
Output Low (clamp) (V
COL
) 0.8 V
V
C
Switching Threshold (V
CSW
) 1.1 V
SENSE AMP
SENSE Input Current (Out of Pin) 65 µA
SENSE Current Limit Threshold
l
44 52 60 mV
Current Mode Gain
∆V(V
C
)/∆V(SENSE)
6 V/V
SENSE Over Current Limit Threshold
l
90 100 110 mV
LED CURRENT / CONTROL
I
SET
Pin Voltage CTRL = 1.5V 1.00 V
LEDx Current (40mA) (R
ISET
= 14.7k) V
LEDx
= 1V, CTRL = 1.5V 38.3 40.1 41.9 mA
LEDx Current Matching (40mA) (R
ISET
= 14.7k) V
LEDx
= 1V, CTRL = 1.5V
l
±0.7
±2
%
LEDx Current (100mA) (R
ISET
= 5.76k) V
LEDx
= 1V, CTRL = 1.5V 95.5 100.7 105.9 mA
LED Pin Regulation Voltage 1.1 V
T
SET
Threshold 630 mV
ANALOG DIMMING
CTRL Input Current (Out of Pin) CTRL = 1V
CTRL = 0.04V
40
50
200
200
nA
nA
LEDx Current (Dimming 25:1) V
LEDx
= 1V, CTRL = 0.04V 1.6 mA
PWM DIMMING
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
24
µA
µA
V
OUT
Pin Current in PWM Mode V(V
OUT
) = 60V PWM = 1.5V, V
LEDx
= 1V
PWM = 0V, V
LEDx
= 1V
370
20
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 LED1 = Open, V
FAULT
= 0.3V 0.3 0.6 mA
LED
x
Short Threshold (V
SH
)
(V
OUT
– V
LEDx
)
V
OUT
= 12V
V
OUT
= 60V
6
6
V
LED Open Detection Threshold V
OUT
= 12V 0.5 V
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.