LM2405

Monolithic Triple 7 ns CRT Driver

General Description

The LM2405 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 chan-

nel has its gain internally set at −14 and can drive CRT ca-

pacitive loads as well as resistive loads presented by other

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

The IC is packaged in an industry standard 11 lead TO-220

molded plastic power package. See thermal considerations

on page 5.

Features

n Rise/fall times typically 7 ns with 8 pF load

n Output swing capability:

50 V

40 V

30 V

n Pinout designed for easy PCB layout

n 0V to 6V input range

n Stable with 0 pF–20 pF capactive loads

n Convenient TO-220 staggered lead package style

Applications

n CRT driver for 1280 x 1024 (Non-interlaced) and XGA

display resolution color monitors

n Pixel clock frequency up to 130 MHz

n Monitors using video blanking

Schematic and Connection Diagram

DS012682-1

FIGURE 1. Simplified Schematic Diagram (One

Channel)

DS012682-2

TabisatGND

Top View

Order Number LM2405T

August 1999

© 1999 National Semiconductor Corporation

DS012682

www.national.com