LM2450 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – 220V Monolithic Triple Channel 7 MHz DC Coupled CRT DTV Driver

December 2005
LM2450
220V Monolithic Triple Channel 7 MHz DC Coupled CRT
DTV Driver
General Description
The LM2450 is a triple channel high voltage DC coupled
CRT driver circuit designed for use in DTV applications. The
IC contains three high input impedance, wide band amplifi-
ers which directly drive the RGB cathodes of a CRT. Each
amplifier has a summing input where the DC level of the
output is controlled by a low voltage DC input voltage. Nor-
mally the DC input voltage is from a DAC. Each channel has
its gain internally set to −54 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 15-lead TO-247 molded plastic
power package designed specifically to meet high voltage
spacing requirements. See Thermal Considerations section.
Features
n 7 MHz bandwidth
n 100V black level adjustment range using 0V to 5V input
n Current output for IK feedback systems
n Greater than 130V_P-P output swing capability
n 0V to 5V input voltage range
n Stable with 0 pF–20 pF capacitive loads and inductive
peaking networks
n Convenient TO-247 staggered thin lead package style
Applications
n DC coupled DTV applications using the 480p format as
well as standard NTSC and PAL formats.
Connection Diagram
Schematic Diagram
20144301
FIGURE 1. Top View
Order Number LM2450TB
See NS Package Number TB15A
20144302
FIGURE 2. Simplified Schematic Diagram
(One Channel)
© 2005 National Semiconductor Corporation DS201443
www.national.com