Datasheet

LT3758/LT3758A
28
3758afd
typicAl ApplicAtions
12V Output Nonisolated Flyback Power Supply
Efficiency vs Output Current Start-Up Waveform
SENSE
LT3758
V
IN
D
SN
V
IN
36V TO 72V
C
IN
2.2µF
100V
X7R
63.4k
200kHz
GATE
FBX
GND
INTV
CC
SHDN/UVLO
SYNC
RT
SS
0.022µF
100V
T1
1,2,3
(SERIES)
4,5,6
(PARALLEL)
1M
44.2k
0.47µF
100pF
10k
10nF
0.030Ω
5.1Ω
1N4148
15.8k
1%
105k
1%
C
VCC
4.7µF
10V
X5R
V
OUT
12V
1.2A
3758 TA03a
C
OUT
47µF
X5R
6.2k
D1
SW
M1
C
IN
: MURATA GRM32ER72A225KA35L
T1: COILTRONICS VP2-0066
M1: VISHAY SILICONIX SI4848DY
D1: ON SEMICONDUCTOR MBRS360T3G
D
SN
: VISHAY SILICONIX ES1D
C
OUT
: MURATA GRM32ER61C476ME15L
V
C
OUTPUT CURRENT (A)
0.01
EFFICIENCY (%)
20
50
40
30
60
70
80
90
100
0.1 1
3758 TA03b
10
V
IN
= 48V
5ms/DIV
V
OUT
5V/DIV
3758 TA03c
V
IN
= 48V
Frequency Foldback Waveforms
When Output Short-Circuit
20µs/DIV
V
OUT
5V/DIV
V
SW
50V/DIV
3758 TA03d
V
IN
= 48V