Datasheet

12
LT1072
1072fc
Negative Buck Converter
LT1072 • TA11
R3
C3
25µF*
V
IN
–20V
R2
1.24k
Q1
2N3906
R1
4.64k
C2
500µF
D1
L1**
220µH
C1
V
IN
V
SW
FB
V
C
GND
LT1072
LOAD
–5.2V AT 1A
OPTIONAL
OUTPUT
FILTER
L2
4µH
C4
200µF
OPTIONAL
INPUT
FILTER
L3
REQUIRED IF INPUT LEADS ≥ 2"
PULSE ENGINEERING 52626
*
**
+
+
+
Positive Buck Converter
Driving High Voltage FET
(for Offline Applications, See AN-25)
LT1072 • TA10
+
10 TO 20V
V
IN
V
SW
GND
LT1072
D1
GD
Q1
LT1072 • TA12
C1
1µF
R3
470Ω
OPTIONAL
OUTPUT
FILTER
REQUIRED IF INPUT LEADS ≥ 2"
PULSE ENGINEERING 52626
*
**
D1
r
D2
L2
4µH
1N914
V
IN
V
SW
FB
V
C
GND
LT1072
R2
1.24k
R4
10Ω
100mA
MINIMUM
5V, 1A
C3
2.2µF
C2
1µF
D3
V
IN
R1
3.74k
L1**
220µH
C4
500µF
C5*
25µF
C5
200µF
+
+
+
+
TYPICAL APPLICATIO S
U