LTC3705 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC3705' PDF : 20 Pages View PDF
TYPICAL APPLICATIO S
LTC3705
VIN+
L1 1µH
1µF
100V
1µF
100V
x3
Si7852DP
Si7852DP
MURS120
T1
••
9:2
Si7336ADP
MURS120
1nF
100V
10Ω
0.25W
1nF
100V
10Ω
0.25W
L2 1.2µH
1.2Ω
Si7336ADP
×2
1µF
CMPSH1-4
VIN–
365k
1%
1nF
15k
1%
30mΩ
1W
2.2nF
250V
2mΩ
2W
10µF
25V
100Ω
100k
680pF
FQT7N10
BAS21 0.22µF
NDRV
BOOST TG TS BG IS
L1: VISHAY IHLP-2525CZ-01
L2: COILCRAFT SER2010-122
T1: PULSE PA0807
T2: PULSE PA0297
UVLO
LTC3705
FB/IN+
100Ω
T2
0.1µF • •
2.2µF
25V
VCC
SS/FLT
FS/IN–
GND PGND VSLMT
470pF
5k
2:1
33nF
162k
33nF
100Ω 100Ω
1nF
1µF
FG SW
IS–
IS+
PT+
CZT3019
2.2µF
16V
SG VIN
LTC3706
NDRV VCC
FS/SYNC
FB
ITH
PT–
RUN/SS GND PGND PHASE SLP MODE REGSD 680pF
100k
20k
VOUT+
330µF
6.3V
×3
VOUT–
102k
1%
22.6k
1%
3705 F06
VOUT
50mV/DIV
Load Step
Efficiency
95
VIN = 36V
90
IOUT
10A/DIV
20µs/DIV
VIN = 48V
VOUT = 3.3V
LOAD STEP = 0A TO 20A
3705 F06b
VIN = 72V
85
80
0
5
10
15
20
25
LOAD CURRENT (A)
3705 F06c
Figure 6. 36V-72V to 3.3V/20A Isolated Forward Converter Using LTC3706
3705fb
17
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