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LT3597
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 = 24V, BOOST = 29V, BIAS = 5V, EN/UVLO = 5V, PWM1-3 = 3.3V,
CTRL1-3 = CTRLM = T SET = 2.0V, V OUT1-3 = 24V, SYNC = 0V, unless otherwise specified. (Note 2)
PARAMETER
LED String Current Matching
LED Pin Voltage
CONDITIONS
R ISET1-3 = 20k
Adaptive V OUT Loop Enabled
l
MIN
TYP
±0.35
±0.35
1.1
MAX
±1.5
±2
UNITS
%
%
V
LED1-3 Open Detection Threshold
0.28
V
LED1-3 Short Protection Threshold (from GND)
PWM1-3 = 3.3V
10
15
V
LED1-3 Short Protection Threshold (from V OUT1-3 )
LED1-3 Pin Leakage Current
V OUT1-3 = 6V
V LED1-3 = 42V
1
1.25
2
200
V
nA
PWM1-3 Input Low Voltage
PWM1-3 Input High Voltage
PWM1-3 Pin Bias Current
CTRL1-3 Voltage for Full LED Current
1.6
1.2
0.4
200
V
V
nA
V
CTRL1-3 Pin Bias Current
CTRLM Voltage for Full LED Current
CTRLM Pin Bias Current
FAULT Output Voltage Low
FAULT Pin Input leakage Current
CTRL1-3 = 6V
CTRLM = 3V
I FAULT = 200μA
FAULT = 25V
1.2
0.11
200
200
200
nA
V
nA
V
nA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 3: For Maximum Operating Ambient Temperature, see Thermal
Considerations in the Applications Information section.
Note 4: Guaranteed by design.
Note 2: The LT3597E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3597I specifications are guaranteed over the full –40°C to 125°C
operating junction temperature range.
3597fa
4
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