Datasheet

LTC3901
14
3901f
TYPICAL APPLICATIO S
U
240W 42V-56V Input to Unregulated 12V Half-Bridge Converter
5
46
A
B
11V12VV
IN
MMBT3904
15
LTC3723EGN-2
DRVB
SDRB
SDRA
COMP
V
CC
UVLO
12
62k
330pF
12V
MMBZ5242B
150pF
1
0.47µF
1µF
DRVA
DPRG V
REF
RAMP SPRG GND SSCS FBC
T
470pF
0.47µF
4.7k
0.22µF
2N7002
B
CS
+
T3
1(1.5mH):0.5
T1
5:4:4:2:2
1µF
8913
1k
22Ω
0.1µF
C1
2.2nF
250V
1µF
100V
1µF
100V
1µF
100V
1µF
100V
0.22µF
Si7370DP
×2
Si7852DP
×2
1
6
5
42
3
A
Si7370DP
×2
1500pF
100V
L2 0.22µH
L3
1mH
C3
68µF
V
F
•
•
11
3
2
8
19
5
4
16
10k
120Ω
30.1k
7
10
14
7.5Ω
D4 D5
7.5Ω
220pF
100Ω
10k
3k
4.7k
1/4W
100pF
215k
15k
1/4W
SYNC PV
CC
CSF
+
V
F
LTC3901EGN
CSF
–
8
11 12
1
41013 7
1µF
1µF
3901 TA02
–V
OUT
10V
MMBZ5240B
1k
V
OUT
MF MF
GND PGND GND PGND TIMER
V
CC
330pF
14 15
10k
3k
33.2k 100Ω
4.7k
1/4W
CSE
+
V
E
20Ω 1W
–V
OUT
V
OUT
V
OUT
–V
OUT
CSE
–
65
ME ME
23 16
MMBT3904
Si7852DP
×2
L1
0.56µH
72
4
CS
+
T2
70(980µH):1
8
7
1
3
12V
D2
D1
D3
3
5
1
6
•
••
•
•
•
•
9
11
V
E
+
LTC4440ES6
BOOSTIN
+
TG
TSGND
V
CC
11V
1µF
100V
V
IN
V
IN
–V
IN
48V
IN
1µF
100V
C2
180µF
16V
+
1µF
1µF, 100V TDK C4532X7R2A105M
C1: MURATA DE2E3KH222MB3B
C2: SANYO 16SP180M
C3: AVX TPSE686M020R0150
D1-D3: BAS21
D4, D5: MMBD914
L1: COILCRAFT DO1813P-561HC
L2: SUMIDA CDEP105-0R2NC-50
L3: COILCRAFT DO1608C-105
T1: PULSE PA0801.005
T2: PULSE P8207
T3: PULSE PA0785