LT1072CS8-PBF 查看數據表（PDF） - Linear Technology

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LT1072CS8-PBF

1.25A High Efficiency Switching Regulator

Linear Technology 

TYPICAL APPLICATIO S

D3†

1N4001

C4 +

5µF

Positive to Negative Buck-Boost Converter

R5†

470Ω, 1W

VIN

VSW

LT1072

GND

VC FB

R3

5k

C2

0.1µF

C5

100µF*

R1

10.7k

VIN

10 TO 30V

D2 R4

1N914 47Ω

*REQUIRED IF INPUT LEADS ≥ 2"

**PULSE ENGINEERING 92113

†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 ≈ (500µF)(IOUT).

FOR 5V OUTPUTS, REDUCE R3

TO 1.5k, INCREASE C2 TO 0.3µF,

AND REDUCE R6 TO 100Ω

+

R2

1.24k

C3

2µF

D1

L1**

200µH

+ C1†

1000µF

R6

470Ω

VOUT

–12V AT 2A

LT1072 • TA07

LT1072

External Current Limit

VX

R2

R1

500Ω

≈ 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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