LT3758 LINER [Linear Technology], LT3758 Datasheet - Page 32

• Manufacturer Part Number: LT3758
• Description: High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
• Manufacturer: LINER [Linear Technology]

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