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LT3757 Datasheet(PDF) 7 Page - Analog Devices

Part # LT3757
Description  36V, 4A Synchronous Step-Down LED Driver with Silent Switcher
PDF  22 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT3757 Datasheet(HTML) 7 Page - Analog Devices

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LT3935
7
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
LED Current (Analog CTRL)
LED Current (Digital CTRL)
LED Voltage Limit
LED Current (100% Regulation)
LED Current (5% Regulation)
ISMON Voltage
C/10 Threshold
LED Current vs VIN
LED Current vs VOUT
CTRL VOLTAGE (V)
0 0.25 0.50 0.75 1 1.25 1.50 1.75 2
–10
0
10
20
30
40
50
60
70
80
90
100
110
LED Current (Analog CTRL)
3935 G19
CTRL DUTY RATIO (%)
0 12.5 25 37.5 50 62.5 75 87.5 100
–10
0
10
20
30
40
50
60
70
80
90
100
110
LED Current (Digital CTRL)
3935 G20
VCTRL = 2V
FB VOLTAGE (V)
0.97
0.98
0.99
1
1.01
1.02
0
25
50
75
100
125
LED Voltage Limit
3935 G21
VCTRL = 1.5V
200 UNITS
150°C
25°C
–40°C
VISP – VISN (mV)
98.8
99.2
99.6 100.0 100.4 100.8 101.2
0
40
80
120
160
200
LED Current (100% Regulation)
3935 G22
VCTRL = 300mV
200 UNITS
150°C
25°C
–40°C
VISP - VISN (mV)
4.8
4.9
5.0
5.1
5.2
5.3
0
40
80
120
160
200
LED Current (5% Regulation)
3935 G23
VISP – VISN (mV)
0
50
100
150
200
250
300
0
0.5
1.0
1.5
2.0
ISMON Voltage
3935 G24
RISING
FALLING
TEMPERATURE (°C)
–50 –25
0
25
50
75 100 125 150
6
8
10
12
14
16
18
C/10 Threshold
3935 G25
2 LEDs (APPROX.8V)
2MHz SW FREQUENCY
VCTRL = 735mV
VIN LOWER THAN VOUT
VIN VOLTAGE (V)
0
6
12
18
24
30
36
48.0
48.4
48.8
49.2
49.6
50.0
LED Current vs VIN
3935 G26
VIN = 36V
VCTRL = 750mV
2MHz SW FREQUENCY
VOUT VOLTAGE (V)
0
6
12
18
24
30
36
48.0
49.0
50.0
51.0
52.0
3935 G27



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