Datasheet

LTC1871-7
29
18717fd
Typical applicaTions
Output Efficiency at 3.3V Output
A 48V Input Flyback Converter Configurable to 3.3V or 5V Outputs
Output Efficiency at 5V Output
9
7
10
8
6
1
2
4
5
3
100k
100k
V
IN
36V TO 72V
10V
26.7k
82.5k
12.4k
R2*
21k
*R2 = 38.3k FOR V
OUT
= 5V
R1
604k
1nF
0.1µF
2.2µF
100V
100µF
6.3V
×3
V
OUT
3.3V
3A MAX
T1B
UPS840
CTX-002-15242
T1A
•
•
Q1
FDC2512
ALL CAPACITORS
ARE CERAMIC
X5R TYPE
R3
0.1Ω
4.7µF
18717 TA02a
RUN
I
TH
FREQ
MODE/SYNC
V
FB
V
IN
GATE
SENSE
INTV
CC
GND
LTC1871-7
MMBTA42
I
LOAD
(A)
0
60
EFFICIENCY (%)
65
70
75
80
90
1
2 3 4
18717 TA02b
5 6
85
36V
IN
48V
IN
72V
IN
I
LOAD
(A)
0
60
EFFICIENCY (%)
65
70
75
80
90
1
2 3 4
18717 TA02c
5
85
36V
IN
48V
IN
72V
IN