Datasheet

LT1170/LT1171/LT1172
16
117012fg
TYPICAL APPLICATIONS
Forward Converter
1170/1/2 TA16
C1
2000
µF
C3
R4
R2
1.24k
V
IN
20V TO 30V
R3
LT1170
V
IN
V
SW
FB
V
C
1
N
D3
L1
25µH
C4
R6
330Ω
R5
1
Ω
C2
M
D2
D1
V
OUT
5V, 6A
T1
Q1
D4
R1
3.74k
GND
+
High Efficiency 5V Buck Converter
+
V
SW
FB
GND
V
IN
V
C
LT1170
+
C1
330µF
35V
C6
0.02µF
C4
0.1µF
R1
680Ω
C5
0.03µF
D1
MBR330p
C3
4.7µF
TANT
D2
1N4148
L1
50µH
R2*
0.013Ω
C2
390µF
16V
V
OUT
5V
3A**
+
s
MODE LOGIC
220pF
<0.3V = NORMAL MODE
>2.5V = SHUTDOWN
OPEN = BURST MODE
* R2 IS MADE FROM PC BOARD
COPPER TRACES.
** MAXIMUM CURRENT IS DETERMINED
BY THE CHOICE OF LT1070 FAMILY.
SEE APPLICATION SECTION.
V
IN
1170/1/2 TA17
OPTIONAL
OUTPUT
FILTER
100µF
16V
10µH
3A
+
V
C
GND
MODE
DIODE
V
OUT
V
LIM
V
+
LT1432
V
IN