Datasheet

LT3825
27
3825fe
TYPICAL APPLICATIONS
48V to 5V at 8A Isolated Supply
+
+
100k12k
•
•
•
•
•
V
OUT
+
5V
8A
V
IN
+
36V TO 72V
0.03Ω
1W
Si4490DY
P6SMB100A
MBRS1100
15k
1%
ALL CAPACITORS 25V UNLESS OTHERWISE NOTED
T1: EDFD25-3F3 GAP FOR L
P
= 200µH (i.e., AL = 200nH/T
2
)
3.01k
1%
R7
20Ω
47µF
20V
47k
1/4W
0.1µF
29.4k
1%
402k
1%
BAS21
2.1k
1%
100k
100k
680pF
10k
15Ω
B0540W
47Ω
470µF
6TPE470MI
×4
FMMT718 FMMT618
10Ω
1/4W
PA0184
8
1 4
5
BAT54
330Ω
47pF
2.2µF
100V
0.1µF
0.22µF
10nF
2.2nF
0.1µF
1µF
0.1µF
T1
2.2nF
250V
Si7336ADP
×2
1nF
3825 TA02a
t
ON
SYNC
PGDLY
UVLO
SENSE
–
V
C
SENSE
+
R
CMP
ENDLY OSC
LT3825
GND SFST
SG
FB
V
CC
SG
SG
PG
C
CMP
10
11
8
9
7
12
3
1
5
4
PINS 1 TO 3, 32T OF 2 × 32AWG
PINS 4 TO 5, 11T OF 1 × 32AWG
PINS 1 TO 3, 32T OF 2 × 32AWG
PINS 10, 11, 12 TO PINS 7, 8, 9, 4T OF 5 MIL COPPER FOIL
PINS 1 TO 3, 32T OF 2 × 32AWG
2 MIL
POLYESTER
FILM
Efficiency vs Load Current
LOAD CURRENT (A)
1
EFFICIENCY (%)
92
4
3825 TA02b
86
82
2 3 5
80
78
94
90
88
84
6 7 8
36V
IN
72V
IN
48V
IN
Output Regulation vs Load Current
LOAD CURRENT (A)
1
4.75
OUTPUT (V)
4.80
4.90
4.95
5.00
5.25
5.10
3
5
6
3825 TA02c
4.85
5.15
5.20
5.05
2
4
7
8
36V
IN
72V
IN
48V
IN