LTC3721-2 LINER [Linear Technology], LTC3721-2 Datasheet - Page 16

• Manufacturer Part Number: LTC3721-2
• Description: Synchronous Rectifier Driver for Forward Converters
• Manufacturer: LINER [Linear Technology]

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