LM2422

220V Monolithic Triple Channel 30 MHz CRT DTV Driver

General Description

The LM2422 is a triple channel high voltage CRT driver

circuit designed for use in DTV 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 −52 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 designed specifically to meet

high voltage spacing requirements. See Thermal Consider-

ations section.

Features

n

30 MHz bandwidth

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Greater than 130V

n

0V to 5V input voltage range

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Stable with 0 pF–20 pF capacitive loads and inductive

peaking networks

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Convenient TO-220 staggered thin lead package style

Applications

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HDTV applications using the 1080i format as well as

other DTV and standard TV formats.

Connection Diagram

Schematic Diagram

20138201

FIGURE 1. Top View

Order Number LM2422

See NS Package Number TE11B

20138202

FIGURE 2. Simplified Schematic Diagram

(One Channel)

January 2005

© 2005 National Semiconductor Corporation

DS201382

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