Datasheet

LTC4446
10
4446f
TYPICAL APPLICATION
LTC3722/LTC4446 420W 36V-72V
IN
to 12V/35A Isolated Full-Bridge Supply
18 10
911
12V
V
IN
12
LTC3722EGN-1
PDLY
OUTF
OUTE
COMPSSPGNDGND
CS
V
IN
SBUS UVLO
1μF
ADLY
330pF
MMBT3904
2.2nF
D12 5.1V
T3
1(1.5μH):0.5
T1
5(105μH):1:1
T2
5:5(105μH):1:1
2.49k 9.53k
10k
2.7k
470Ω
1/4W
L4
1mH
C3
68μF
20V
V
H
•
•
16
15
8 19
5 4
150Ω
0.02Ω 1.5W
30.1k
220pF
100Ω
330Ω
2.21k
1.5k 2.21k 1.5k
4.87k 1/4W
4.87k 1/4W
51Ω
2W
220pF
182k
20k
1/4W
22pF
22pF
4.99k
80.6k
80.6k
68.1k 18.2k
4.99k
180pF
68nF
220pF0.47μF
20k
SYNC PV
CC
CSE
+
LTC3901EGN
CSE
–
8
65
1
41013 7
1μF
1μF
4446 TA02a
–V
OUT
V
OUT
–V
OUT
D10
10V
V
OUT
ME ME2
V
OUT
V
OUT
GND PGND GND2 PGND2 TIMER
V
CC
330pF
23
39.2k
100Ω 1k
CSF
+
–V
OUT
V
OUT
V
OUT
–V
OUT
V
OUT
12V/35A –V
OUT
CSF
–
11 12
MF MF2
14 15 16
22nF
Si7852DP s4
Si7852DP s4
Si7852DP ×2
L1
1.3μH
114
2
12V
D7
D8
4 2 1 6
•
••••
•••
10 8 7
+
1
0.22μF
Si7852DP s2
3
6 7
894
A
2
B
D2
LTC4446
BOOSTTINP
BINP
TG
TSGNDBG
V
CC
12V
1 2
0.22μF
Si7852DP s2
3
6 7
894
C
D
D3
D4
D5
51Ω
2W
0.47μF
100V
LTC4446
BOOSTTINP
BINP
TG
TSGNDBG
V
CC
12V
1μF 100V s4
V
IN
V
IN
–V
IN
36V TO 72V
1μF 100V
17
D
OUTD
19
C
OUTC
20
B
OUTB
21
A
BC
OUTA
C1, C2
180μF
16V
s2
+
1μF
0.47μF, 100V TDK C3216X7R2A474M 1μF, 100V TDK C4532X7R2A105M C1,C2: SANYO 16SP180M C3: AVX TPSE686M020R0150 C4: MURATA DE2E3KH222MB3B D4-D6: MURS120T3 D2, D3, D7, D8: BAS21 D9: MMBZ5226B D10: MMBZ5240B D11: BAT54 D12: MMBZ231B L1: SUMIDA CDEP105-1R3MC-50 L2: PULSE PA0651 L3: PA1294.910 L4: COILCRAFT DO1608C-105 Q1, Q2: ZETEX FMMT619 Q3, Q4: ZETEX FMMT718 T1, T2: PULSE PA0526 T3: PULSE PA0297
6
3
422236
33k 1M
57
D11
8.25k
I
SNS
5V
REF
I
SNS
0.1μF
58
1
2
1
MOC207
C4
2.2nF
250V
0.047μF
3
6
5
8
GND-F
V
+
GND-S
COLL REF
LT1431CS8
1k
22Ω
200k
750Ω
100Ω
D9 3.3V
0.02Ω 1.5W
V
H
D6
2k
1/2W
0.82μF
100V
470pF 200V
L3
0.85μH
47Ω 1W
0.47μF
100V
Si7852DP s2
11 10 8 7
MMBT3904
FBSPRG
R
LEB
6.19k
13
SYNC
5.1k
1
NC
8
DPRG
2
V
REF
5V
REF
14
C
T
24
L2
150nH
•
Q1
Q3
Q2
Q4