Datasheet

10
LTC4440
4440f
LTC3723-1 240W 42-56V
IN
to 12V/20A Isolated 1/4Brick (2.3" × 1.45")
TYPICAL APPLICATIO S
U
5
46
A
B
12V
V
IN
15
LTC3723EGN-1
DRVB
SDRB
SDRA
COMP
CS
V
CC
UVLO
9
150k
1
0.47µF
1µF
DRVA
DPRG V
REF
SPRGGND SSFB C
T
330pF
22nF
100k
D8
10V
68nF
270pF
T2
1(1.5mH):0.5
T1
4T:6T(65µHMIN):6T:2T:2T
243k
2.49k
9.53k
10k
750Ω
1k
100Ω
1/4W
813
3
Si7370DP
×2
L4
1mH
C3
68µF
20V
V
F
D2
•
•
3
2
8
19
5
4
16
10k
33k
200Ω
1/4W
R1
0.03Ω
1.5W
66.5k
RLEB
12
7
14
220pF
22nF
100Ω
665Ω
1k
866Ω
6.19k
1/4W
1.5nF
464k
30k
1/4W
SYNC PV
CC
CSF
+
V
F
LTC3901EGN
CSF
–
8
11 12
1
41013 7
22nF
1µF
4.7µF
4440 TA05
–V
OUT
V
OUT
–V
OUT
D7
10V
V
OUT
MF MF2
GND PGND GND2 PGND2 TIMER
V
CC
470pF
14 15
1k
866Ω
42.2k
1k
100Ω
6.19k
1/4W
CSE
+
V
E
–V
OUT
V
OUT
V
F
V
OUT
12V/20A
–V
OUT
CSE
–
65
ME ME2
23 16
Si7370DP
×2
Si7852DPSi7852DP
L5
0.56µH
112
4
12V
D5
D6
3
5
1
6
•
••
•
•
9
7
V
E
+
0.1µF
Si7852DP
1
6
5
4
B
2
A
D3
LTC4440ES6
BOOSTINP
TG
TSGND
V
CC
12V
3
0.1µF
Si7852DP
1
6
5
42
B
D4
LTC4440ES6
BOOSTINP
TG
TSGND
V
CC
12V
1µF
100V
×3
V
IN
V
IN
–V
IN
42V TO 56V
1µF
100V
C1, C2
47µF
16V
×2
+
1µF
1µF
100V
1k
1/4W
1µF, 100V TDK C3225X7R2A105M
C1,C2: SANYO 16TQC47M
C3: AVX TPSE686M020R0150
C4: MURATA GHM3045X7R222K-GC
D2: DIODES INC. ES1B
D3-D6: BAS21
D7, D8: MMBZ5240B
L4: COILCRAFT DO1608C-105
L5: COILCRAFT DO1813P-561HC
L6: PULSE PA1294.132 OR
PANASONIC ETQP1H1R0BFA
R1, R2: IRC LRC2512-R03G
T1: PULSE PA0805.004
T2: PULSE PA0785
6
10
I
SNS
I
SNS
0.1µF
11
58
1
2
1
MOC207
C4
2.2nF
250V
0.1µF
3
6
5
8
GND-F
V
+
GND-S
COLL REF
LT1431CS8
A
1.5k
22Ω
4.7Ω
4.7Ω
R2
0.03Ω
1.5W
V
E
470pF
100V
L6
1.25µH
10Ω
1W
6
93
EFFICIENCY (%)
94
95
96
97
81012
LOAD CURRENT (A)
14
16 18 20
42V
IN
48V
IN
56V
IN
MMBT3904
•
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