LTC3721-2 LINER [Linear Technology], LTC3721-2 Datasheet - Page 14

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

LTC3900
Typical applicaTions
14
BC857BF
BAS516
220pF
255R
V
FB
0.1µF
13.3k
165k
22k
V
IN
1
2
3
4
5
PGND
BL
R
SGND
IN
BL
LTC4441
0.47µF
115k
V
33k
PGND
R
DRV
OUT
22k
V
EN
CC
FB
1
2
3
4
5
6
7
8
IN
COMP
FB = 1.23V
R
SYNC
MAXDC
V
SD
GND
10
9
8
7
6
OSC
R
V
= 2.5V
By Using Active Reset and 60V MOSFETs Converter is Achieving 94% to 95%
R
18V TO 40V
LT1952-1
158k
V
U1
18V to 40V Input to 14V at 14A Output Converter in 1/4 Brick Footprint
2.2µF
V
332k
BLANK
IN
6.8µF
×4
DELAY
I
PGND
SENSE
S
OUT
OUT
V
OC
IN
57.6k
16
15
14
13
12
11
10
9
255R
22k
158k
82k
2K
PZTA42
BAS516
0.1µF
PDZ10B
V
Efficiency with Only Four MOSFETs.
S
U1
GATE
OUT
82
96
94
92
90
88
86
84
4.7µF
0.1µF
0
1µF
1.5mH
10k
V
U1
2
40R2-4421.003
Si3459
V
220R
V
FB
IN
4
BAS516
1.2k
6
I
OUT
HAT2266
×2
0.004R
11
PS2801-1
(A)
1
6
7
8
•
•
•
10
2.2nF
2, 3
4, 5
FG
V
V
IN
OUT
1k
= 24V
12
= 14V
3900 TA03b
270R
0.22µF
14
680µH
PDZ7.5B
BCX55
1µF
BAS516
V
AUX
CG
HAT2266
V
1
2
3
BAS521
AUX
10k
10k
CG
V
GND
OC
82k
CC
LT4430
COMP
OPTO
PA1494.362
1
2
3
4
1µF
FB
CS
CS
CG
V
CC
LTC3900
+
–
6
5
4
3.65k
33µF
TIMER
SYNC
GND
FG
15nF
8
7
6
5
+
1.96k
FG
82.5k
33pF
150µF
PXE
V
AUX
47k
470pF
560R
V
14V
14A
OUT1
V
OUT1
PE-68386
•
•
220pF
3900 TA03a
3900fb
GATE