Datasheet
19
LTC1698
1698f
Figure 11. 36V
IN
-72V
IN
to 5V/30A Isolated Synchronous Forward Converter
TYPICAL APPLICATIO S
U
V
CC
13
2
1
5
1µF
0.01µF
82pF
OVLO
SHDN
1.24k
1%
10k
4.7µF
16V
1000pF
5V
REF
6
F
SET
0.1µF
8
SS
10
12
T2
PULSE ENG
P2033
BAS21
BAS21
BAT54
BAT54S
ZVN3310F
9
V
C
PGND
14
V
FB
37
4
THERM
LT3781
SYNC SGND
52.3k
1%
10Ω
1k
3k
1k
3.3k
FZT690B
0.22µF
50V
1
10k
220pF
MOC207
143
1
4
8
7
5
14
15
8
5
6
7
2
3300pF
2200pF
4700pF
5V
REF
5V
REF
SG
11
SENSE
15
BG
18
BSTREF
19
TG
20
BAS21
0.1µF
100V
1mH
DO1608C-105
COILCRAFT
V
BST
1.5µF
100V
1.5µF
100V
0.56µH
DO1813P-561HC
0.022µF
1000pF
••
SYNC V
FB
OVPIN
MARGIN
I
COMP
V
DD
OPTODRV
V
AUX
0.1µF
1612 11
I
SNS
I
SNSGND
FG
2
CG
PGND GND
LTC1698
PWRGD
6
8
9
7
13
1.24k
1%
976Ω
1%
4.22k
1%
3.01k
1%
1043
V
COMP
1698 F11
MMBZ5240B
0.008Ω
1%, 1W
1000pF
100V
2200pF
250V
AC
•
•••
T1
PULSE
PA0285
PULSE
PA0265
100Ω
10Ω
V
IN
+
36V TO 72V
V
IN
–
V
OUT
+
5V /30A
V
OUT
–
RTN
10Ω
1/4W
1000pF
100V
10Ω
1/4W
330pF
+
+
+
+
3.3Ω
V
IN
V
IN
V
CC
V
CC
V
OUT
V
CC
V
OUT
V
CC
V
IN
V
CC
0Ω
2.43k
1%
RT1
100k
1µF
ON/OFF
V
OUT
TRIM
4.7µF
16V
470Ω
V
OUT
FZT853
B0540W
100Ω
0.25W
2k
0.25W
5241B
11V
20k
FMMT619
FMMT718
Si7456DP
Si7456DP
Si7456DP
Si7884DP Si7884DP Si7884DP Si7884DP Si7884DP
Si7456DP
0.047µF
B2100
B2100
470µF
6.3V
POSCAP
470µF
6.3V
POSCAP
470µF
6.3V
POSCAP
470µF
6.3V
POSCAP
22µF
6.3V
1µF
16V
0Ω
B0540W
MMBD4148
0Ω
270k
0.25W
73.2k
1%
1
2
3
4
5
7