Datasheet

LTC4440
10
4440fa
For more information www.linear.com/LTC4440
Typical applicaTions
LTC3723-1 240W 42-56V
IN
to 12V/20A Isolated 1/4Brick (2.3" × 1.45")
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 1 9
5 4
16
10k
33k
200Ω 1/4W
R1 0.03Ω 1.5W
66.5k
RLEB
127 14
220pF
22nF
100
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
4 10 13 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
–
6 5
ME ME2
2 3 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
5 8
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
4.7Ω4.7Ω
R2 0.03Ω 1.5W
V
E
470pF 100V
L6
1.25µH
10Ω 1W
6
93
EFFICIENCY (%)
94
95
96
97
8 10 12
LOAD CURRENT (A)
14
16 18 20
42V
IN
48V
IN
56V
IN
MMBT3904
•