LM2432

220V Monolithic Single Channel 37 MHz HDTV CRT

Driver

General Description

The LM2432 is a single channel high voltage CRT driver

circuit designed for use in Rear-Projection and Direct-View

HDTV applications. The IC contains a high input impedance,

wide band amplifier which can be DC coupled to a cathode

of a CRT. The amplifier has its gain internally set to −53 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 the section “Power Dis-

sipation and Heatsink Calculation” for more information.

Features

n

37 MHz bandwith at 110V

n

0V to 4V input range

n

Greater than 130V

n

IK Current Output (Pin 5) for IK feedback systems

n

Stable with 0–20 pF capacitive loads and inductive

peaking networks

Applications

n

For Rear-Projection and Direct-View DC coupled CRT

applications using up to 720p and 1080i HDTV formats

n

Compatible with RGB video processors with IK feedback

for automatic cathode calibration

Pinout Diagram

Schematic Diagram

20137702

Note: Tab is at GND. Pin 6 is not connected (N/C) internally.

Top View

Order Number LM2432TE

FIGURE 1. Simplified Connection and Pinout Diagram

20137701

FIGURE 2. Simplified Schematic Diagram

April 2005

© 2005 National Semiconductor Corporation

DS201377

www.national.com