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LT3476 Datasheet(PDF) 3 Page - Linear Technology

Part # LT3476
Description  Full-Featured LED Driver with 1.5A Switch Current
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3476 Datasheet(HTML) 3 Page - Linear Technology

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LT3517
3
3517ff
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum VIN Operating Voltage
3V
Maximum VIN Operating Voltage
Continuous Operation (Note 3)
30
V
Current Sense Voltage (VISP – VISN)VCTRL = 2V, VISP = 24V, VC = 1V
VCTRL = 2V, VISP = 0V, VC = 1V
96
100
100
103
mV
mV
10% Scale Current Sense Voltage (VISP – VISN)VCTRL = 100mV, VISP = 24V, VC = 1V
9
mV
Current Sense Voltage Line Regulation
2V < VISP < 45V
0.03
%/V
VIN Supply Current
PWM > 1.5V, VC = 0V
PWM = 0V
SHDN = 0V
6
4.5
0.1
10
1
mA
mA
μA
Switching Frequency
RT = 16.7k
RT = 4.03k
RT = 91.5k
0.85
2.25
220
1
2.5
250
1.15
2.7
270
MHz
MHz
kHz
RT Voltage
1V
Soft-Start Pin Current
SS = 0.5V, Out of Pin
6
9
12
μA
SYNC Pull-Down Current (Into the Pin)
VSYNC = 2V
60
μA
SYNC Input Low
0.4
V
SYNC Input High
1.5
V
Maximum Duty Cycle
RT = 91.5k (250kHz)
SYNC = 300kHz Clock Signal, RT = 91.5k
RT = 16.7k (1MHz)
RT = 4.03k (2.5MHz)
95
94
85
97
96
90
74
%
%
%
%
Switch Current Limit
1.5
1.9
2.3
A
Switch VCESAT
ISW = 1A
300
mV
Switch Leakage Current
VSW = 45V, PWM = 0V
2
μA
CTRL Input Bias Current
Current Out of Pin, VCTRL = 0.1V
20
100
nA
Error Amplifier Transconductance
550
μS
VC Output Impedance
1000
VC Idle Input Bias Current
PWM = 0V, VC = 1V
–20
0
20
nA
FB Pin Input Bias Current
Current Out of Pin, VFB = 0.5V
20
100
nA
FB Pin Threshold
0.98
1.01
1.04
V
ISP, ISN Idle Input Bias Current
PWM = 0V, ISP = ISN = 24V
300
nA
ISP, ISN Full-Scale Input Bias Current
ISP Tied to ISN, VISP = 24V, VCTRL = 2V
20
μA
SHDN Voltage High
1.2
V
SHDN Voltage Low
–40°C ≤ TJ ≤ 125°C
125°C < TJ ≤ 150°C
0.45
0.40
V
V
SHDN Pin Bias Current
60
100
μA
PWM Input High Voltage
1.2
V
PWM Input Low Voltage
–40°C ≤ TJ ≤ 125°C
125°C < TJ ≤ 150°C
0.45
0.40
V
V
PWM Pin Bias Current
60
120
μA
The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 5V, SHDN = 5V, PWM = 5V unless otherwise noted.


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