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LT1072IN8#PBF
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P16
10
LT
1072
1072fc
Flyback Converter
Negative to Positive Buck-Boost Converter
External Current Limit
R1
1k
V
IN
NOTE THAT THE LT1072 GND PIN
IS NO LONGER COMMON TO V
IN
(–)
LT1072 • TA06
C1
1000pF
C2
R
S
R2
+
–
V
IN
V
SW
FB
V
C
GND
LT1072
Q1
C3
0.47
µ
F
V
OUT
5V
1.5A
D2
D1
OPTIONAL
FILTER
1
1
3
N*
N* =
C2
0.15
µ
F
C4
25
µ
F*
V
IN
20 TO 30V
R3
1.5k
REQUIRED IF INPUT LEADS
≥
2"
OPTIONAL TO REPLACE R4 AND C3
*
**
C1
500
µ
F
R4
1k
**
R1
3.74k
R2
1.24k
V
IN
V
SW
FB
V
C
GND
LT1072
L2
10
µ
H
C4
200
µ
F
V
SNUB
V
OUT
+ V
f
I
PRI
I
PRI
I
PRI
(I
PRI
) (L
L
)
V
SNUB
I
PRI
N
∆
I
V
IN
0V
0V
0
0
0
0
CLAMP TURN-ON
SPIKE
PRIMARY FLYBACK VOLTAGE =
LT1072 SWITCH VOLTAGE
AREA “a” = AREA “b” TO MAINTAIN
ZERO DC VOLTS ACROSS PRIMARY
SECONDARY VOLTAGE
AREA “c” = AREA “d” TO MAINTAIN
ZERO DC VOLTS ACROSS SECONDARY
PRIMARY CURRENT
SECONDARY CURRENT
LT1070 SWITCH CURRENT
SNUBBER DIODE CURRENT
V
OUT
+ V
f
N
N • V
IN
t =
a
b
c
d
LT1072 • TA04
+
+
V
IN
V
SW
FB
V
C
GND
LT1072
C2
1000
µ
F
C1
0.22
µ
F
C4
25
µ
F*
R2
1.24k
R3
2.2k
R1
11.3k
V
OUT
12V, 0.5A
V
IN
–12V
D1
L1**
220
µ
H
Q1
*
**
REQUIRED IF INPUT LEADS
≥
2"
PULSE ENGINEERING 52626
OPTIONAL
INPUT
FILTER
L3
OPTIONAL
OUTPUT
FILTER
L2
C3
LT1072 • TA05
+
+
TYPICAL APPLICA
TIO S
U
11
LT
1072
1072fc
Positive to Negative Buck-Boost Converter
External Current Limit
LT1072 • TA08
D1
R1
500
Ω
R2
≈
2V
V
X
V
C
GND
LT1072
Voltage Boosted Boost Converter
LT1072 • TA09
D2
D1
TOTAL INDUCTANCE = 8mH
INTERLEAVE PRIMARY AND
SECONDARY FOR LOW LEAKAGE
INDUCTANCE
1
L1
N = 5
+
C2
0.047
µ
F
R3
10k
V
IN
15V
C1
200
µ
F
R4
1.5k
1/2W
C3
0.68
R1
98k
V
OUT
100V AT 75mA
R2
1.24k
V
IN
V
SW
FB
V
C
GND
LT1072
+
C
C5
100
µ
F*
V
IN
10 TO 30V
*REQUIRED IF INPUT LEADS
≥
2"
**PULSE ENGINEERING 92113
†
TO AVOID START-UP PROBLEMS
FOR INPUT VOLTAGES BELOW 10V,
CONNECT ANODE OF D3 TO V
IN
,
AND REMOVE R5. C1 MAY BE
REDUCED FOR LOWER OUTPUT
CURRENTS. C1
≈
(500
µ
F)(I
OUT
).
FOR 5V OUTPUTS, REDUCE R3
TO 1.5k, INCREASE C2 TO 0.3
µ
F,
AND REDUCE R6 TO 100
Ω
LT1072 • TA07
R4
47
Ω
D1
D2
1N914
C1
†
1000
µ
F
C
C3
2
µ
F
R5
†
470
Ω
, 1W
C
C2
0.1
µ
F
D3
†
1N4001
C4
5
µ
F
R6
470
Ω
R2
1.24k
L1**
200
µ
H
R3
5k
V
OUT
–12V AT 2A
R1
10.7k
V
IN
V
SW
FB
V
C
GND
LT1072
+
+
+
TYPICAL APPLICA
TIO S
U
12
LT
1072
1072fc
Negative Buck Converter
LT1072 • TA11
R3
C3
25
µ
F*
V
IN
–20V
R2
1.24k
Q1
2N3906
R1
4.64k
C2
500
µ
F
D1
L1**
220
µ
H
C1
V
IN
V
SW
FB
V
C
GND
LT1072
LOAD
–
5.2V AT 1A
OPTIONAL
OUTPUT
FILTER
L2
4
µ
H
C4
200
µ
F
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
1
µ
F
R3
470
Ω
OPTIONAL
OUTPUT
FILTER
REQUIRED IF INPUT LEADS
≥
2"
PULSE ENGINEERING 52626
*
**
D1
r
D2
L2
4
µ
H
1N914
V
IN
V
SW
FB
V
C
GND
LT1072
R2
1.24k
R4
10
Ω
100mA
MINIMUM
5V, 1A
C3
2.2
µ
F
C2
1
µ
F
D3
V
IN
R1
3.74k
L1**
220
µ
H
C4
500
µ
F
C5*
25
µ
F
C5
200
µ
F
+
+
+
+
TYPICAL APPLICA
TIO S
U
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P16
LT1072IN8#PBF
Mfr. #:
Buy LT1072IN8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.25A Hi Eff Sw Reg
Lifecycle:
New from this manufacturer.
Delivery:
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