Datasheet

LTC3803
13
3803fc
TYPICAL APPLICATIONS
4:1 Input Range 3.3V Output Isolated Flyback DC/DC Converter
3803 TA05
FDC2512
T1
PA1277NL
•
•
•
0.1µF
0.1µF
100µF
6.3V
× 3
0.33µF
2.2nF
47pF
100k
56k
22.1k
V
IN
+
V
IN
–
V
CC
V
CC
V
OUT
+
V
OUT
+
3.3V
3A
GND
V
OUT
+
MMBTA42
PDZ6.8B
0.1µF
2.2µF
4.7k
680Ω
22Ω
6.8k
270Ω
1
1
2
3
6
5
4
2
BAS516
BAS516
PDS1040
10Ω
BAS516
PS2801-1
100k
68Ω
150pF
220k
0.040Ω
1
2
3
6
5
4
18V TO 72V
I
TH
/RUN
LTC3803
GND
GATE
SENSE
V
CC
V
FB
GND
BAS516
BAT760
LT4430
OC
V
IN
COMP
FB
OPTO
Effi ciency vs Load Current
I
OUT
(A)
0
70
EFFICIENCY (%)
72
74
76
78
80
82
84
1234
3803 TA05a
V
IN
= 48V
V
IN
= 24V