LM2445

Monolithic Triple 7.5 ns CRT Driver

General Description

The LM2445 is an integrated high voltage CRT driver circuit

designed for use in color monitor applications. The IC con-

tains three high input impedance, wide band amplifiers

which directly drive the RGB cathodes of a CRT. Each

channel has its gain internally set to −20 and can drive CRT

capacitive loads as well as resistive loads present in other

applications, limited only by the package’s power dissipation.

The IC is packaged in an industry standard 9-lead TO-220

molded plastic power package. See the Thermal Consider-

ations section for more information.

Features

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Higher gain to match LM126X CMOS preamplifiers

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0V to 3.75V input range

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Stable with 0–20 pF capacitive loads and inductive

peaking networks

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Convenient TO-220 staggered lead package style

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Maintains standard LM243X Family pinout which is

designed for easy PCB layout

Applications

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1024 x 768 displays up to 85 Hz refresh

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Pixel clock frequencies up to 95 MHz

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Monitors using video blanking

Schematic Diagram

20063701

FIGURE 1. Simplified Schematic Diagram

(One Channel)

March 2003

© 2003 National Semiconductor Corporation

DS200637

www.national.com