LTC3706_15 Datasheet, PDF (19/22 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller with PolyPhase Capability

LTC3706
TYPICAL APPLICATIONS
36V to 72V to 12V/20A Isolated Forward Converter. Can Be Paralleled for Higher Output Power
+V_IN
L5
0.68µH
2.2µF
100V
2.2µF
100V
×3
1 T3 2
•
4
•
330Ω
3
BAS21
I_S+
–V_OUT
7.5Ω
Si7450DP
×3
100Ω
T1
2• ^•8
4
3•
5
11
1nF
100V
680pF _5.1Ω
200V _1/2W
5.1Ω
1/2W
–V_OUT
A
1nF
100V
•
L6
2.4µH
B
510Ω
HAT2244WP
×2
HAT2244WP
×2
+ 68µF
10µF
16V
×2
100pF
10mΩ
1.5W
2.2µF
10µF
25V
–V_IN
SW
365k
100k
FDC2512
V_CC
FB/IN⁺
UVLO LTC3725
15.0k
1µF
SSFLT
1nF
10nF
FS/IN^–
2.2nF
250V 12Ω
0.1µF
5.1k ^150pF
470pF
100Ω
100k
SW
CMPSH1-4
T2
5
4
1µF
PT⁺
6
8
3
1
PT^–
10pF _BAT21
I_S+
10nF
100Ω MMBT2907A
68pF
150Ω
150Ω
LTC3706
FCX491A
V_AUX
11.5k
FB
CMPSH1-4
0.1µF
100k 0.1µF
Si2303BDS
68k
BAS21
V_{AUX 36V}
MMBZ5258B
2N7002
390Ω
100k 110k
10nF
470pF
6.2k
4.7nF
604Ω
CMPSH1-4
A
T4
4• •1
CMPSH1-4
B6
3
L1
100µH
–V_OUT
L1: COILCRAFT DO1606T-104MLC
L5: VISHAY IHLP2525CZERR68M01
L6: PULSE PA1494.242
T1: PULSE PA0955 (6:6:3)
T2: PULSE PA1954NL (1:1:1)
T3: ICE CT02-100 (1:100)
T4: COILCRAFT DA2318-ALC (1:1.5)
3706 TA03
NPNs: DIODES FMMT619
PNPs: DIODES FMMT718
2.2nF 250V MURATA GA343QR7GD222KW01L
68µF 16V SANYO 16TQC68M
+V_OUT
–V_OUT
–V_OUT
3706fd
19