LX1744

Microsemi

Integrated Products Division

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

Page 11

Dual Output Boost – LED Driver / LCD Bias

I N T E GR A T ED

PRODUCT S

Copyright

© 2000

Rev. 1.1b, 2005-03-01

EVALUATI ON BOA RD

Table 1: Input and Output Pin Assignments

Name

Input/Output

Range

Description

VIN

0 to 6V

Main power supply for outputs.

GNDx

0V

Common ground reference.

ADJ

0 to VIN-100mV

Apply a DC voltage or a PWM voltage to this pin to adjust the LCD1

output voltage. PWM inputs should be greater than 120Hz.

SHDN

Pulled up to VIN on board (10KΩ), Ground to inhibit the LED driver

output (VOUT).

SHDN

0 to VIN

Pulled up to VIN on board (10KΩ), Ground to inhibit the VLCD1.

VLCD

≤25V

Output voltage test point. Programmed for 18V output, adjustable up to

25V.

-VLCD

≥-25V

Output voltage mirror of VLCD1

VOUT

≤25V

LED drive voltage probe point.

LFB

0 to VIN

LED current sense feedback.

BRT

0 to 350mV

Apply a DC voltage or a PWM voltage to this pin to adjust the LED

current. PWM inputs should be greater than 120Hz with a DC portion

less than 350mV.

DRV

0 to VIN

LED Driver MOSFET Gate Driver Output

REF

1.19V Typ.

Buffered IC reference output.

Note: All pins are referenced to ground.