Datasheet

LT3758/LT3758A
30
3758afd
typicAl ApplicAtions
36V to 72V Input, 3.3V Output Isolated Telecom Power Supply
SENSE
LT3758
V
IN
INTV
CC
BAV21W
FDC2512
0.03Ω
V
IN
36V TO 72V
C
IN
2.2µF
100V
X7R
63.4k
200kHz
GATE
FBX
GND
SHDN/UVLO
SYNC
RT
SS
0.022µF
100V
4.7µF
25V
X5R
1M
44.2k
0.47µF
V
OUT
+
3.3V
3A
V
OUT
-
3758 TA05a
5.6k
16k
4.7µF
25V
X5R
10Ω
274Ω
BAS516
PS2801-1
BAS516
2
4
3
8
7
6
UPS840
5
1
0.47µF
LT4430
47nF
1µF
V
IN
GND
OPTO
COMP
OC 0.5V FB
47pF
2k
22.1k
100kBAT54CWTIG
2200pF
250VAC
100pF
C
OUT
100µF
6.3V
×3
PA1277NL
V
C
OUTPUT CURRENT (A)
0.01
EFFICIENCY (%)
20
50
40
30
60
70
80
90
100
0.1 1
3758 TA05b
10
V
IN
= 36V
V
IN
= 72V
V
IN
= 48V
Efficiency vs Output Current