LM2421

Monolithic Triple Channel HDTV Driver

General Description

The LM2421 is an integrated high voltage CRT driver circuit

designed for use in HDTV applications. The IC contains

three high input impedance, wide band amplifiers which

directly drive the RGB cathodes of a CRT. Each channel has

its gain internally set to −42 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 11-lead TO-220

molded plastic power package. See Thermal Considerations

section.

Features

n

0V to 5V input range

n

Stable with 0–20 pF capacitive loads and inductive

peaking networks

n

Convenient TO-220 staggered lead package style

n

Maintains standard LM240X Family pinout which is

designed for easy PCB layout

Applications

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AC coupled HDTV applications using the 1080i and

720p formats as well as standard NTSC and PAL

formats.

Schematic and Connection Diagrams

DS200233-1

FIGURE 1. Simplified Schematic Diagram

(One Channel)

DS200233-2

Note: TabisatGND

Top View

Order Number LM2421TA

November 2001

© 2001 National Semiconductor Corporation

DS200233

www.national.com