LT1082IT datasheet(5/12 Pages) LINEAR

Part #	LT1082IT

Description	1A High Voltage, Efficiency Switching Voltage Regulator

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Manufacturer	LINEAR [Linear Integrated Systems]

Direct Link	http://www.linearsystems.com

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5

LT1082

sn1082 1082fas

CC

HARA TERISTICS

A

TYPICALPERFOR

CE

Isolated Mode Flyback

Reference Voltage

TEMPERATURE (

°C)

25

24

23

22

21

20

19

18

17

16

15

1082 G09

–75 –50

50

100

25

150 175

–25 0

75

125

RFB = 3k

RFB = 6k

RFB = 10k

Supply Current vs Input Voltage**

SUPPLY VOLTAGE (V)

0

200

160

120

80

40

0

30

50

80

1082 G15

10

20

40

60

70

VC = 50mV

VC = 0V

Supply Current vs Supply Voltage

(Shutdown Mode)

INPUT VOLTAGE (V)

0

20

40

60

80

1082 G14

14

13

12

11

10

9

8

7

6

5

4

3

2

10

30

50

70

90% DUTY CYCLE

50% DUTY CYCLE

10% DUTY CYCLE

0% DUTY CYCLE

**UNDER VERY LOW OUTPUT CURRENT CONDITIONS,

DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH

10% OR LESS.

Feedback Bias Current vs

Temperature

TEMPERATURE (

°C)

1082 G12

800

700

600

500

400

300

200

100

0

–75 –50

50

100

25

150 175

–25 0

75

125

Normal/Feedback Mode

Threshold on Feedback Pin

TEMPERATURE (

°C)

750

725

700

675

650

625

600

575

550

525

500

1082 G16

–75 –50

50

100

25

150 175

–25 0

75

125

–24

–22

–20

–18

–16

–14

–12

–10

–8

–6

–4

FEEDBACK PIN VOLTAGE

(AT THRESHOLD)

FEEDBACK PIN CURRENT

(AT THRESHOLD)

VC PIN VOLTAGE (mV)

200

180

160

140

120

100

80

60

40

20

0

1082 G17

0

10

50

70

40

90 100

20 30

60

80

–55

°C ≤ TJ ≤ 125°C

TJ = 150°C

Shutdown Mode Supply Current

Reference Voltage and Switching

Frequency vs Temperature

TEMPERATURE (

°C)

70

65

60

55

50

45

1082 G11

1.250

1.245

1.240

1.235

1.230

1.225

–75 –50

50

100

25

150 175

–25 0

75

125

FREQ

VREF

INPUT VOLTAGE (V)

0

5

4

3

2

1

0

–1

–2

–3

–4

–5

20

40

50

1082 G10

10

30

60

70

80

TJ = 25°C

TJ = –55°C

TJ = 150°C

Line Regulation

SWITCH CURRENT (A)

100

90

80

70

60

50

40

30

20

10

0

1082 G13

0

0.2

1.0

1.4

0.8

1.8 2.0

0.4 0.6

1.2

1.6

* AVERAGE SUPPLY CURRENT

= IQ + DC(2.9 + 10

–2 ISW + 10–5ISW2)

IQ = QUIESCENT CURRENT, DC = DUTY CYCLE,

ISW = SWITCH CURRENT

Driver Current* vs Switch Current

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