LT1072CK 查看數據表（PDF） - Linear Technology

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LT1072CK

1.25A High Efficiency Switching Regulator

Linear Technology 

LT1072

TYPICAL PERFOR A CE CHARACTERISTICS

Switch Current Limit vs Duty Cycle

4

3

–55°C

25°C

2

125°C

1

0

0 10 20 30 40 50 60 70 80 90 100

DUTY CYCLE (%)

LT1072 • TPC01

Maximum Duty Cycle

96

95

94

93

92

91

90

–75 –50 –25 0 25 50 75 100 125 150

JUNCTION TEMPERATURE (°C)

LT1072 • TPC02

Minimum Input Voltage

2.9

2.8

SWITCH CURRENT = 1.25A

2.7

2.6

SWITCH CURRENT = 0A

2.5

2.4

2.3

–75 –50 –25 0 25 50 75 100 125 150

TEMPERATURE (°C)

LT1072 • TPC04

Line Regulation

5

4

3

TJ = 150°C

2

1

TJ = 25°C

0 TJ = – 55°C

–1

–2

–3

–4

–5

0

10 20 30 40 50 60

INPUT VOLTAGE (V)

LT1072 • TPC07

Switch Saturation Voltage

1.6

1.4

150°C

1.2

100°C

1.0

25°C

0.8

–55°C

0.6

0.4

0.2

0

0 0.25 0.5 0.75 1 1.25 1.5 1.75 2

SWITCH CURRENT (A)

LT1072 • TPC05

Reference Voltage and Switching

Frequency vs Temperature

1.250

42

1.248

SWITCHING FREQUENCY 41

1.246

40

1.244

39

1.242

38

REFERENCE VOLTAGE

1.240

37

1.238

36

1.236

35

1.234

34

–75 –50 –25 0 25 50 75 100 125 150

TEMPERATURE (°C)

LT1072 • TPC08

Flyback Blanking Time

2.2

2.0

1.8

1.6

1.4

1.2

1.0

–75 –50 –25 0 25 50 75 100 125 150

JUNCTION TEMPERATURE (°C)

LT1072 • TPC03

Isolated Mode Flyback Reference

Voltage

23

22

21

RFEEDBACK = 500Ω

20

19

RFEEDBACK = 1kΩ

18

17

RFEEDBACK = 10kΩ

16

15

–75 –50 –25 0 25 50 75 100 125 150

TEMPERATURE (C°)

LT1072 • TPC06

Feedback Bias Current vs

Temperature

800

700

600

500

400

300

200

100

0

–75 –50 –25 0 25 50 75 100 125 150

TEMPERATURE (°C)

LT1072 • TPC09

1072fc

4

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