Datasheet

LTC3900
16
3900fb
Typical applicaTions
18V to 72V Input to 12V at 13A Active Reset Converter Fits in 1/8th Brick Size
I
OUT
(A)
0
90
92
96
6 10
3900 TA05b
88
86
2 4
8 12 14
84
80
82
94
EFFICIENCY (%)
24V
IN
48V
IN
The High Efficiency of Converter is Achieved by Precise MOSFET Timing Provided
by LT1952 and LTC3900 Controllers.
16
15
14
13
12
11
10
9
COMP
FB = 1.23V
R
OSC
SYNC
MAXDC
V
R
= 2.5V
SD
GND
S
OUT
V
IN
OUT
PGND
DELAY
OC
I
SENSE
BLANK
1
2
3
4
5
6
7
8
LT1952-1
BAS516
LTC4440
HAT2173
×2
GATE
22k
220pF
237Ω
Si2325
33nF
10k
0.1µF
BAS516
V
U1
V
FB
57Ω 0.006Ω
3 5
1, 6
2, 4
137k
13.3k
189k
22k
1k
0.1µF
1µF
39.2K
V
FB
V
U1
BC857
33k
174k
V
R2
332k
V
B
4.7µF
40R2-4444.004
BAS516
PZTA42
10V
1.5mH
V
U1
1
6
2.2µF
×3
V
IN
18V TO 72V
V
IN
33k
2
5
•
•
V
R2
V
OUT
12V
13A
HAT2173
×2
PA2050.103
HAT2169
33µF
330µF
FG
7
10
•
CG
0.22µF
BAS521
680µH
+
560R
220pF
GATE
FG
470pF
PE-68386
1µF
10k
1k
22k
7.5V
BCX55
10k
47k
CG
LTC3900
CS
+
CS
–
CG
V
CC
SYNC
TIMER
GND
FG
1
2
3
4
8
7
6
5
•
•
3900 TA05a
V
OUT
1µF
2.2nF
1.2k
BAS516
470R
PS2801-1 LT4430
7.87k
18.2k
348k
10pF
10nF
V
CC
GND
OC
OPTO
COMP
FB
1
2
3
6
5
4