Datasheet
17
LT1339
sn1339 1339fas
TYPICAL APPLICATIONS
U
6
7
10
20
19
18
11
12
16
14
13
9
17
U1
LT1339
12V
158
C14
3300pF
C12
100pF
R9
12k
R10
10k
1%
R8
301k
1%
R6, 100Ω
R7
100Ω
D5
BAT54
+
+
+
+
+
1339 TA05
T1
13:2
C1: SANYO 63MV680GX
C2: WIMA SMD4036/1.5/63/20/TR
C6: KEMET T510X477M006AS (X8)
L1: GOWANDA 50-318
T1: GOWANDA 50-319
L1
1.5µH
R5
2.49k
1%
SS
V
C
V
REF
V
BOOST
TG
TS
SENSE
+
SENSE
–
BG
PHASE
RUN/SHDN
V
FB
SGND
12V
IN
PGND
C15
0.1µF
C10
0.1µF
C9
1800pF
5%
NPO
C11
0.1µF
D2
MURS120
D4
MBR0530T1
SYNC
1
2
4
3
5
5V
REF
SL/ADJ
CT
I
AVG
8
7
6
5
V
CC1
OUT1
V
CC2
OUT2
IN1
GND1
IN2
GND2
1
2
3
4
U2, LTC1693-2
8
7
6
5
V
CC1
OUT1
V
CC2
OUT2
IN1
GND1
IN2
GND2
1
2
3
4
U3, LTC1693-2
+
C7
1µF
+
C13
1µF
+
C5
1µF
+
C1
680µF
63V
Q1
MTD20N06HD
D3
MURS120
Q3
MTD20N06HD
4
3 21
D1
MURS120
+
C8
1µF
R1
0.04Ω
8 7 6 5
4
Q4
Si4420
X2
Q2
Si4420
X2
V
OUT
1,8V
20A
3
21
8 7 6 5
+
C3
4700pF
25V
R2
5.1Ω
+
C6
470µF
6.3V
X8
+
C4
0.1µF
R3
549Ω
1%
R4
1.24k
1%
V
IN
48V
+
C2
1.5µF
63V
+
48V to 1.8V 2-Transistor Synchronous Forward Converter