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LT1072CN8 Datasheet, PDF (11/16 Pages) Linear Technology – 1.25A High Efficiency Switching Regulator | |||
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TYPICAL APPLICATIO S
D3â
1N4001
C4 +
5µF
Positive to Negative Buck-Boost Converter
R5â
470â¦, 1W
VIN
VSW
LT1072
GND
VC FB
R3
5k
C2
0.1µF
C5
100µF*
R1
10.7k
VIN
10 TO 30V
D2 R4
1N914 47â¦
*REQUIRED IF INPUT LEADS ⥠2"
**PULSE ENGINEERING 92113
â TO AVOID START-UP PROBLEMS
FOR INPUT VOLTAGES BELOW 10V,
CONNECT ANODE OF D3 TO VIN,
AND REMOVE R5. C1 MAY BE
REDUCED FOR LOWER OUTPUT
CURRENTS. C1 â (500µF)(IOUT).
FOR 5V OUTPUTS, REDUCE R3
TO 1.5k, INCREASE C2 TO 0.3µF,
AND REDUCE R6 TO 100â¦
+
R2
1.24k
C3
2µF
D1
L1**
200µH
+ C1â
1000µF
R6
470â¦
VOUT
â12V AT 2A
LT1072 ⢠TA07
LT1072
External Current Limit
VX
R2
R1
500â¦
â 2V
D1
LT1072
GND
VC
LT1072 ⢠TA08
Voltage Boosted Boost Converter
VIN +
15V
R4 C3
1.5k 0.68
1/2W
VIN
VSW
LT1072
GND
VC FB
R3
10k
C2
0.047µF
D2
1 TOTAL INDUCTANCE = 8mH
L1 INTERLEAVE PRIMARY AND
N = 5 SECONDARY FOR LOW LEAKAGE
INDUCTANCE
R1
D1
98k
VOUT
100V AT 75mA
R2
+
1.24k
C1
200µF
LT1072 ⢠TA09
1072fc
11
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