Microsemi

Integrated Products Division

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

Page 5

Copyright

© 2000

Rev. 1.1b, 2005-03-03

LX1741

High Efficiency High Voltage Boost Controller

I N T E GRA T ED

PR ODUC T S

Typical LCD Bias Applications (Cont)

V

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

+

=

2

1

ADJ

OUT

R

R

1

V

V

R

1

R

2

C

1

4.7µF

C

2

*

1nF

R

CS

1kΩ

L

1

* Optional Component

used to reduce output

voltage ripple.

47µH

V

+

-

LX1741

NDRV

SHDN

IN

SRC

GND

FB

CS

ADJ

Figure 3

– Dynamic Output Voltage Operation Via Analog Voltage Input

LED Driver Application

C

1

4.7µF

R

CS

1kΩ

L

1

47µH

1206 Case Size

R

3

63.4Ω

V

ON OFF

R

1

1ΜΩ

R

2

59kΩ

V

I

⎠

⎞

⎜⎜

⎝

⎛

⎟

⎠

⎞

⎜

⎝

⎛

+

−

⎟

⎠

⎞

⎜

⎝

⎛

=

2

1

2

F

ADJ

3

LED

R

R

R

V

4

V

R

1

I

LX1741

NDRV

SHDN

IN

SRC

GND

FB

CS

ADJ

Figure 4

– LED Driver with Full-Range Dimming Via PWM Input

Note

The component values shown are only examples for a working system. Actual values will vary greatly depending on

desired parameters, efficiency, and layout constraints.