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LT3758 Datasheet(PDF) 32 Page - Linear Technology

Part # LT3758
Description  High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
PDF  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3758 Datasheet(HTML) 32 Page - Linear Technology

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LT3758
32
3758f
TYPICAL APPLICATIONS
18V to 72V Input, 24V Output SEPIC Converter
SENSE
LT3758
VIN
VIN
18V TO 72V
CIN
2.2μF
100V
X7R
CDC
2.2μF
100V
X7R, x2
VOUT
24V
1A
0.025Ω
M1
41.2k
300kHz
GATE
FBX
GND INTVCC
SHDN/UVLO
SYNC
RT
SS
VC
•
•
232k
20k
0.47μF
10nF
10k
L1A
L1B
D1
CIN, CDC: TAIYO YUDEN HMK325B7225KN-T
COUT: MURATA GRM31CR61E106KA12L
3757 TA06a
280k
1%
20k
1%
COUT
10μF
25V
X5R
x4
CVCC
4.7μF
10V
X5R
L1A, L1B: COILTRONICS DRQ127-470
M1: FAIRCHILD SEMICONDUCTOR FDMS2572
D1: ON SEMICONDUCTOR MBRS3100T3G
Efficiency vs Output Current
OUTPUT CURRENT (A)
0.001
10
30
20
40
50
60
70
80
90
100
0.01
0.1
3757 TA06b
1
VIN = 72V
VIN = 48V
VIN = 18V
Load Step Waveform
500μs/DIV
VOUT
1V/DIV
(AC)
0.8A
0.2A
IOUT
0.5A/DIV
3757 TA06c
VIN = 48V
Start-Up Waveform
2ms/DIV
VOUT
10V/DIV
IL1A + IL1B
1A/DIV
3757 TA06d
VIN = 48V
50μs/DIV
VSW
50V/DIV
VOUT
20V/DIV
IL1A + IL1B
2A/DIV
3757 TA06e
VIN = 48V
Frequency Foldback Waveforms
When Output Short-Circuit



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