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LTC1698IGN Datasheet(PDF) 18 Page - Linear Technology

Part # LTC1698IGN
Description  Isolated Secondary Synchronous Rectifier Controller
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1698IGN Datasheet(HTML) 18 Page - Linear Technology

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18
LTC1698
1698f
APPLICATIO S I FOR ATIO
CG
VDD
LTC1698
PGND
GND
OPTODRV
VCOMP
MARGIN
CFB
R1
BOLD LINES INDICATE HIGH CURRENT PATHS
RC
CC
VFB
SYNC
FG
VAUX
ICOMP
ISNS
ISENSGND
PWRGD
OVPIN
2
1
3
4
5
6
7
8
15
16
COUT
VOUT
+
VOUT
–
14
13
12
11
10
9
R2
R7
D3
RSECSEN
Q4
CK
RK
MOC207
C4
0.1
µF
R4
1698 F09
1k
0.1
µF
4.7
µF
T2
T1
0.1
µF
CCILM
RCILM
R5
1k
+
Q3
1
Ω
L1
Figure 9. LTC1698 Layout Diagram
Figure 10. Simplified Single Secondary Winding 3.3V and 1.8V Output Isolated DC/DC Converter
VCOMP
VDD
LTC1698
GND
VFB
CG
FG
ISNS
SYNC
OPTODRV
VCC
BIAS
L1
VOUT1
3.3V
AT 10A
BG
LT3781
SG
ISOLATION
BOUNDARY
COUT2: POSCAP, 680µF/4V
L2: SUMIDA CEP125-IR8MC-H
Q1, Q2: SILICONIX Si7440DP
1698 F10
VIN
36V
TO 72V
VREF
VC
VFB
TG
•
•
GBIAS
4.7
µF
CMDSH-3
Q1
Q2
B340A
3.01k
2.32k
L2
1.8
µH
0.006
Ω
VCC BOOST
CL–
CL+
LT3710
SYNC
TG
CSET
ILCOMP
SS
•
•
–
+
0.1
µF
3.3k
33nF
10pF
CS
680pF
10k
10k
180pF
0.01
µF
BGS
PGND
SW
BG
VAOUT
VFB
4700pF
VOUT2
1.8V
AT 10A
COUT2
+
220
Ω



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