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LT3757 Datasheet(PDF) 8 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) 8 Page - Analog Devices

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LT3935
8
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
FB OPENLED Threshold
FB SHORTLED Threshold
FB OVLO Threshold
Efficiency vs VIN
Efficiency vs ILED
Regulated FB Voltage
Input Voltage Transient Response
Input Voltage Transient
Respsonse
Turn-On and Turn-Off
RISING
FALLING
TEMPERATURE (°C)
–50 –25
0
25
50
75 100 125 150
0.80
0.85
0.90
0.95
1.00
1.05
1.10
FB OPENLED Threshold
3935 G28
RISING
FALLING
TEMPERATURE (°C)
–50 –25
0
25
50
75 100 125 150
100
150
200
250
300
350
400
FB SHORTLED Threshold
3935 G29
RISING
FALLING
TEMPERATURE (°C)
–50 –25
0
25
50
75 100 125 150
0.90
0.95
1.00
1.05
1.10
FB OVLO Threshold
3935 G30
2LEDs (APPROX.7V, 2A)
400kHz
2MHz
VIN VOLTAGE (V)
6
12
18
24
30
36
70
75
80
85
90
95
100
Efficiency vs VIN
3935 G31
VIN = 12V
2MHz SW FREQUENCY
2 LEDs (APPROX. 8V)
1 LED (APPROX. 5V)
ILED (mA)
0
800
1600
2400
3200
4000
80
85
90
95
100
Efficiency vs ILED
3935 G32
VCTRL = 2V
VISP–VISN=0V
TEMPERATURE (°C)
–50 –25
0
25
50
75 100 125 150
0.97
0.98
0.99
1.00
1.01
1.02
Regulated FB Voltage
3935 G33
data0
data0
Input Voltage Transient Response
FRONT PAGE APPLICATION
15V TO 25V INPUT VOLTAGE STEP
3 LEDs (APPROX. 9V)
ILED = 4A
5ms/DIV
VIN
10V/DIV
ILED
200mA/DIV
3935 G34
data0
data0
Input Voltage Transient Response
FRONT PAGE APPLICATION
25V TO 15V INPUT VOLTAGE STEP
3 LEDs (APPROX. 9V)
ILED = 4A
5ms/DIV
VIN
10V/DIV
ILED
200mA/DIV
3935 G35
data0
data0
data0
Turn–On and Turn–Off
FRONT PAGE APPLICATION
3 LEDs (APPROX. 9V)
50ms/DIV
VIN
20V/DIV
VOUT
5V/DIV
ILED
2A/DIV
3935 G36



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