LTC1698 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1698' PDF : 24 Pages View PDF
LTC1698
APPLICATIO S I FOR ATIO
L1
T1
1Ω
Q3
Q4
RSECSEN
VOUT+
+
COUT
VOUT–
D3
C4
T2
R7 R2
4.7µF
RK
MOC207
CK
R1 RC
CC
1
VDD
2
CG
16
FG
LTC1698
15
SYNC
3
PGND
4 GND
5
OPTODRV
6
VCOMP
14
VAUX
13
ICOMP
12
ISNS
11
ISENSGND
7
CFB
MARGIN
8
VFB
10
PWRGD
9
OVPIN
BOLD LINES INDICATE HIGH CURRENT PATHS
Figure 9. LTC1698 Layout Diagram
CCILM
RCILM R5
1k
0.1µF 1k
0.1µF
0.1µF
R4
1698 F09
VIN
36V
TO 72V
••
TG BG
SG
LT3781
••
VC
+ VREF
– VFB
L1
VCC
BIAS
VDD
VCOMP
CG
VFB
FG
ISNS
LTC1698
SYNC
10k
180pF
10k
10pF
CS
680pF
0.01µF
VCC BOOST
SYNC GBIAS
LT3710
CSET TG
SW
ILCOMP BG
SS VAOUT
BGS
PGND VFB
CL– CL+
CMDSH-3
4.7µF
0.1µF
3.3k
33nF
OPTODRV
GND
VOUT1
3.3V
AT 10A
Q1
L2
1.8µH 0.006Ω
VOUT2
1.8V
+ AT 10A
Q2 B340A
4700pF
COUT2
3.01k 220Ω
2.32k
1698 F10
ISOLATION
BOUNDARY
COUT2: POSCAP, 680µF/4V
L2: SUMIDA CEP125-IR8MC-H
Q1, Q2: SILICONIX Si7440DP
Figure 10. Simplified Single Secondary Winding 3.3V and 1.8V Output Isolated DC/DC Converter
1698f
18
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