LT1768IGN datasheet(15/20 Pages) LINER

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LT1768

APPLICATIONS INFORMATION

together with minimum trace between them. If space

constraints prohibit the transformer T1 placement next to

C1, local bypassing (C2) for the center tap of transformer

T1 should be used.

Special attention is also required for the layout of the high

voltage section to avoid any unpleasant surprises. Please

refer to the references for an extensive discussion on high

voltage layout techniques.

Applications Support

Linear Technology invests an enormous amount of time,

resources, and technical expertise in understanding, de-

signing and evaluating backlight solutions for systems

designers. The design of an efficient and compact back-

light system is a study of compromise in a transduced

electronic system. Every aspect of the design is interre-

lated and any design change requires complete re-evalu-

ation for all other critical design parameters. Linear

Technology has engineered one of the most complete test

and evaluation setups for backlight designs and under-

stands the issues and trade-offs in achieving a compact,

efficient and economical customer solution. Linear Tech-

nology welcomes the opportunity to discuss, design,

evaluate, and optimize any backlight system with a cus-

tomer. For further information on backlight designs, con-

sult the references below.

References

1. Williams, Jim. November 1995. A Fourth Generation of

LCD Backlight Technology. Linear Technology Corpora-

tion, Application Note 65.

1768 F08

VIN

*OPTIONAL

BOLD LINES INDICATE

HIGH CURRENT PATHS

LT1768

GATE

PGND

VIN

SENSE

Figure 8

Supply Bypass and Layout Considerations

Proper supply bypassing and layout techniques must be

used to insure proper regulation, avoid display flicker, and

insure long term reliability.

Figure 8 shows the application’s critical high current paths

in thick lines. Ideally, all components in the high current

path should be placed as close as possible and connected

with short thick traces. The most critical consideration is

that T1’s center tap, the Schottky diode D1, LT1768’s VIN

pin, and a low ESR capacitor (C1) be connected directly

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