LT1786FCS datasheet(5/20 Pages) LINER

Part #	LT1786FCS

Description	SMBus Programmable CCFL Switching Regulator

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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5

LT1786F

TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (

°C)

–3

–1

1

0

–2

10

9

6

8

7

5

3

2

4

–75

125 150

–25 0

–50

25 50

75 100

175

CCFL VC = 0.5V

CCFL VC = 1.0V

CCFL VC = 1.5V

1786 G10

VC Sink Offset Current

vs Temperature

TEMPERATURE (

°C)

4.80

4.90

4.85

5.00

4.95

5.10

5.05

–25

25

75

125

1786 G11

175

–50

–75

0

50

100

150

ICCFL = 10µA

ICCFL = 50µA

ICCFL = 100µA

∆CCFL VC Source Current for

∆ICCFL Programming Current

vs Temperature

TEMPERATURE (

°C)

0

0.4

0.2

0.8

0.6

1.2

1.0

–25

25

75

125

1786 G12

175

–50

–75

0

50

100

150

I(DIO) = 1mA

I(DIO) = 5mA

I(DIO) = 10mA

Positive DIO Voltage

vs Temperature

TEMPERATURE (

°C)

–75

1.2

1.6

125

1786 G13

0.8

0.4

0

–25

25

75

175

1.0

1.4

0.6

0.2

100

–50

0

50

150

I(DIO) = 1mA

I(DIO) = 5mA

I(DIO) = 10mA

TEMPERATURE (

°C)

–75

101

103

125

1786 G14

99

97

95

–25

25

75

175

100

102

98

96

100

–50

0

50

150

I(DIO) = 1mA

I(DIO) = 5mA

I(DIO) = 10mA

Negative DIO Voltage

vs Temperature

VC to DIO Current Servo Ratio

vs Temperature

TEMPERATURE (

°C)

0

0.10

0.05

0.20

0.15

0.30

0.25

–25

25

75

125

1786 G15

175

–50

–75

0

50

100

150

VC Low Clamp Voltage

vs Temperature

TEMPERATURE (

°C)

–75

1.7

1.8

2.0

2.1

2.2

2.4

–50

50

100

1786 G16

1.9

2.3

25

150 175

–25 0

75

125

VC High Clamp Voltage

vs Temperature

VC Switching Threshold

vs Temperature

TEMPERATURE (

°C)

–75

0.6

0.7

0.9

1.0

1.1

1.3

–50

50

100

1786 G17

0.8

1.2

25

150 175

–25 0

75

125

TEMPERATURE (

°C)

–75

7.1

7.3

7.5

7.4

7.2

7.0

6.8

6.6

125 150

1786 G18

6.9

6.7

6.5

–25 0

–50

25 50

75 100

175

ICCFL = 10µA

ICCFL = 50µA

ICCFL = 100µA

BULB Protect Servo Voltage

vs Temperature

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