LX1996

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 6

Copyright

© 2007

Rev. 1.0, 2007-12-14

Multi-string LED Back-light Controller

TM

®

ELECTRICAL CHA RACTERISTICS

LED Short Protection

Threshold

Vcs

Voltage at CS pin that latches off it’s

respective string.

15

V

CS pin Over-voltage Limit

Voltage at CS pin that clamps Boost Output

23

25

27

V

LED Current Sink Outputs

Mode

19.2

20

20.8

mA

LED DC Current Programming

Accuracy (including string to

string matching)

= 0.8V; DI ≥ 2.0V; Direct Analog Dimming

Mode

14.4

15

15.6

mA

Analog Dimming Accuracy

DI=0.5V; Direct Analog Dimming Mode

5

mA

Direct Digital Dimming

Accuracy

PWM input at 25kHz , 25% duty cycle;

Average (DC) LED current.

5

mA

Current Matching between

strings (Note 3).

VIN = 6V to 28V; -40°C to 85°C; VCS = 0.8V

to 5V; DI ≥ 2.0V; Direct Analog Dimming Mode

-1.3

1.3

%

Regulated CS Pin Voltage

0.5

0.75

V

LED current On Rise Time

200

ns

LED current Off Fall Time

400

ns

Csx current to PRG current

Ratio

50

PRG Reference Voltage

2.0

V

LED Current Temperature Profiler

LED Over Temperature Shut-

down Voltage Threshold

1.47

V

OT Recovery Voltage

Threshold

1.8

V

OT Input Bias Current

1

μA

2.0

V

1.2

V

Reference Voltage (Note 1, 2)

0.8

V

VLDO Regulator

4.75

5.0

5.25

V

VLDO Output Voltage

4.5

5.25

V

VLDO Source Current

External available current

1

mA

UVLO

VLDO rising

4.0

4.25

4.5

V

UVLO Hysteresis

0.25

V

Boost Converter

DRV Rise Time

25

nsec

DRV Fall Time

14

ns