Datasheet

LT3825
28
3525fe
TYPICAL APPLICATIONS
48V to 3.3V at 6A Isolated Supply
Efficiency vs Load Current Output Regulation vs Load Current
+
+
100k15k
•
•
•
•
•
V
OUT
+
3.3V
6A
V
IN
+
36V TO 72V
0.04Ω
1W
Si4490DY
Si7892DP
15k
1%
3.01k
1%
R7
20Ω
47µF
20V
47k
1/4W
0.1µF
26.1k
1%
402k
1%
BAS21
866Ω
1%
62k
10k
680pF
10k
15Ω
B0540W
47Ω
150µF
6TPB150ML
×3
PA0184
8
1 4
5
BAT54
330Ω
47pF
0.82µF
100V
0.1µF
0.22µF
3.3nF
2.2nF
0.1µF
1µF
0.1µF
T1
PULSE PB2134
2.2nF
250V
3825 TA03a
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
FMMT718
FMMT618
LOAD CURRENT (A)
1
EFFICIENCY (%)
86
88
90
5
3825 TA03b
84
82
80
2
3
4
6
36V
IN
72V
IN
48V
IN
LOAD CURRENT (A)
1
3.38
3.43
5
3825 TA03c
3.33
3.28
2 3 4 6
3.23
3.18
3.13
OUTPUT (V)
36V
IN
72V
IN
48V
IN