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LT3757 Datasheet(PDF) 5 Page - Analog Devices

Part # LT3757
Description  Boost, Flyback, SEPIC and Inverting Controller
PDF  38 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT3757 Datasheet(HTML) 5 Page - Analog Devices

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LT3757/LT3757A
5
Rev. G
For more information www.analog.com
TEMPERATURE (°C)
–75 –50
1580
1585
1590
1605
1600
0
50 75
1595
–25
25
100
150
125
3757 G01
VIN = 40V
VIN = 24V
VIN = 8V
VIN = INTVCC = 2.9V
SHDN/UVLO = 1.33V
TEMPERATURE (°C)
–802
–800
–798
–788
–790
–792
–794
–804
–796
3757 G02
–75 –50
0
50 75
–25
25
100
150
125
VIN = 40V
VIN = 24V
VIN = 8V
VIN = INTVCC = 2.9V
SHDN/UVLO = 1.33V
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Frequency
vs Temperature
SENSE Current Limit Threshold
vs Temperature
SENSE Current Limit Threshold
vs Duty Cycle
Dynamic Quiescent Current
vs Switching Frequency
RT vs Switching Frequency
Normalized Switching Frequency
vs FBX
Positive Feedback Voltage
vs Temperature, VIN
Negative Feedback Voltage
vs Temperature, VIN
Quiescent Current
vs Temperature, VIN
TA = 25°C, unless otherwise noted.
FBX VOLTAGE (V)
–0.8
0
20
40
60
80
120
–0.4
0
0.4
0.8
3757 G06
1.2
1.6
100
–75 –50
0
50 75
–25
25
100
150
125
TEMPERATURE (°C)
100
105
110
115
120
3757 G08
DUTY CYCLE (%)
0
95
105
20
40
80
60
115
100
110
100
3757 G09
–75 –50
0
50 75
–25
25
100
150
125
TEMPERATURE (°C)
1.4
1.6
1.8
1.5
1.7
3757 G03
VIN = 40V
VIN = 24V
VIN = INTVCC = 2.9V
SWITCHING FREQUENCY (KHz)
0
0
15
20
35
300
500 600 700
10
5
25
30
100 200
400
900
800
1000
3757 G04
CL = 3300pF
SWITCHING FREQUENCY (KHz)
0
10
100
1000
300
500 600 700
100 200
400
900
800
1000
3757 G05
–75 –50
0
50 75
–25
25
100
150
125
TEMPERATURE (°C)
270
280
290
300
310
330
3757 G07
320
RT = 41.2K



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