LTC3706_15 Datasheet, PDF (18/22 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller with PolyPhase Capability

LTC3706
TYPICAL APPLICATIONS
V_IN+
L1 1µH
1µF
100V
1µF
100V
×3
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
V_OUT+
330mF
6.3V
×3
V_IN–
365k
1%
1nF
15k
1%
30µΩ
1W
2.2nF
250V
2mΩ
2W
10µF
25V
100Ω
100k
680pF
FQT7N10
BAS21 ^0.22µF
2.2µF
25V
NDRV
UVLO
V_CC
SS/FLT
BOOST TG TS BG IS
FB/IN⁺
LTC3705
FS/IN^–
GND PGND VSLMT
L1: VISHAY IHLP-2525CZ-01
L2: COILCRAFT SER2010-122
T1: PULSE PA0807
T2: PULSE PA0297
100Ω 0.1µF
470pF _5k
T2
••
1:2
33nF
162k
33nF
100Ω 100Ω
1nF
1µF
FG SW
I_S–
I_S+
PT⁺
CZT3019
2.2µF
16V
SG V_IN
LTC3706
NDRV V_CC
FS/SYNC
FB
ITH
PT^–
RUN/SS GND PGND PHASE SLP MODE REGSD 680pF
100k
20k
102k
1%
V_OUT–
22.6k
1%
3706 F05
Figure 5. 36V-72V to 3.3V/20A Isolated Forward Converter
(See Typical Performance Characteristics)
3706fd
18