LM3639A datasheet(11/28 Pages) TI

部件名	LM3639A

功能描述	Single Chip 40V Backlight 1.5A Flash LED Driver

Download	28 Pages

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制造商	TI [Texas Instruments]

网页	http://www.ti.com

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11 / 28 page

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

V

IN (V)

C001

T

A = +85

°

C

T

A = +25

°

C and -40°C

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

V

IN (V)

C001

T

A = +85°C

T

A = +25°C

T

A = -40°C

0

0.0001

0.0002

0.0003

0.0004

0.0005

0.0006

0.0007

0.0008

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

V

IN (V)

ILED-MAX = 5mA

ILED-MAX = 19mA

ILED-MAX = 29.5mA

C037

0

0.0001

0.0002

0.0003

0.0004

0.0005

0.0006

0.0007

0.0008

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

V

IN (V)

+25C

+85C

-40C

C036

I

LED-MAX = 19mA

Brightness Code = 127

PWM Pin = GND

0.000

0.002

0.004

0.006

0.008

0.010

0.012

0.014

0.016

0.018

0.020

0

20

40

60

80

100

Duty Cycle (%)

500Hz

1kHz

5kHz

10kHz

25kHz

50kHz

100kHz

500kHz

C035

0.0090

0.0095

0.0100

0.0105

0.0110

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

V

IN (V)

D1, -40C

D2, -40C

D1, +25C

D2, +25C

D1, +85C

D2, +85C

C034

Duty-Cycle = 50%

f

PWM = 50kHz

I

LED-MAX = 19mA

LM3639A

www.ti.com

SNVS964 – MARCH 2013

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Unless otherwise specified: TA = 25°C; VIN = 3.6V; VEN = VIN; CIN= 10 μF, COUTF= 10 μF, COUTB = 1 μF (50V 0805 case

size); LF = 1

μH; LB = 22 μH.

Figure 33. LED Current vs PWM Duty-Cycle

Figure 34. LED Current vs Input Voltage

w/ PWM Enabled

Figure 35. PWM Offset Current vs Input Voltage

Figure 36. PWM Offset Current vs Input Voltage

Tri-Temp

Different Max. LED Current, Brightness Code = 127

Figure 37. Shutdown Current vs. VIN

Figure 38. Standby Current vs. VIN

EN = 0V

EN = VIN

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