LT1072IT Datasheet, PDF (12/16 Pages) Linear Technology – Available in MiniDiP, TO-220, and TO-3 Packages

LT1072
TYPICAL APPLICATIO S
Driving High Voltage FET
(for Offline Applications, See AN-25)
+
10 TO 20V
V_IN
V_SW
LT1072
GND
GD
Q1
D1
LT1072 • TA10
Negative Buck Converter
C3 +
25µF*
OPTIONAL
INPUT
FILTER
L3
V_IN
–20V
D1
V_IN
V_SW
LT1072
C2 ⁺
500µF
R1 _LOAD
4.64k
L1**
220µH
Q1
2N3906
–5.2V AT 1A
GND
V_C ^FB
C1 _R2
1.24k
R3
*REQUIRED IF INPUT LEADS ≥ 2"
**PULSE ENGINEERING 52626
OPTIONAL ₊
OUTPUT
FILTER
L2
4µH
C4
200µF
LT1072 • TA11
12
Positive Buck Converter
V_IN
D3
C3 ⁺
2.2µF
C5* ⁺
25µF
V_IN
V_SW
LT1072
GND
V_C ^FB
R3
470Ω
C1
1µF
R2
1.24k
r
R1
3.74k
C2 ⁺
1µF
D1
*REQUIRED IF INPUT LEADS ≥ 2"
**PULSE ENGINEERING 52626
L2
4µH
OPTIONAL
OUTPUT
FILTER
D2
1N914
L1**
220µH
C4 ⁺
500µF
C5
200µF
R4
10Ω
5V, 1A
100mA
MINIMUM
LT1072 • TA12
1072fc