LM2459

Monolithic Single Channel 15 MHz DTV CRT Driver

General Description

The LM2459 is a single channel high voltage CRT driver

circuit designed for use in DTV applications. The IC contains

a high input impedance, wide band amplifier which directly

drives the cathode of a CRT. The amplifier has its gain

internally set to −51 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 a staggered 7-lead TO-220 molded

plastic power package designed specifically to meet high

voltage spacing requirements. See Thermal Considerations

section.

Features

n

15MHz bandwith at 130V

n

0V to 4V input range

n

Greater than 130V

n

Stable with 0–20 pF capacitive loads and inductive

peaking networks

n

Transient response improvement option via pin 6 (EM)

Applications

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AC coupled DTV applications using the 480p format as

well as standard NTSC and PAL formats.

Connection Diagram

Schematic Diagram

20067802

Note: Tab is at GND

Top View

Order Number LM2459TE

FIGURE 1. Simplified Connection and Pinout Diagram

20067801

FIGURE 2. Simplified Schematic Diagram

May 2004

© 2004 National Semiconductor Corporation

DS200678

www.national.com