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PDF LM2405T Data sheet ( Hoja de datos )
| Número de pieza | LM2405T | |
| Descripción | Monolithic Triple 7 ns CRT Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 1999
LM2405
Monolithic Triple 7 ns CRT Driver
General Description
The LM2405 is an integrated high voltage CRT driver circuit
designed for use in color monitor applications. The IC con-
tains three high input impedance, wide band amplifiers
which directly drive the RGB cathodes of a CRT. Each chan-
nel has its gain internally set at −14 and can drive CRT ca-
pacitive loads as well as resistive loads presented by 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
on page 5.
Features
n Rise/fall times typically 7 ns with 8 pF load
n Output swing capability:
50 VPP for VCC = 80
40 VPP for VCC = 70
30 VPP for VCC = 60
n Pinout designed for easy PCB layout
n 0V to 6V input range
n Stable with 0 pF–20 pF capactive loads
n Convenient TO-220 staggered lead package style
Applications
n CRT driver for 1280 x 1024 (Non-interlaced) and XGA
display resolution color monitors
n Pixel clock frequency up to 130 MHz
n Monitors using video blanking
Schematic and Connection Diagram
Tab is at GND
DS012682-1
FIGURE 1. Simplified Schematic Diagram (One
Channel)
DS012682-2
Top View
Order Number LM2405T
© 1999 National Semiconductor Corporation DS012682
www.national.com
1 page  
Application Hints (Continued)
signal traces from the preamplifier to the LM2405 and from
the LM2405 to the CRT cathode should be as short as pos-
sible. The following references are recommended:
Ott, Henry W., “Noise Reduction Techniques in Electronic
Systems”, John Wiley and Sons, New York, 1976.
“Guide to CRT Video Design”, National Semiconductor Appli-
cation Note 861.
“Video Amplifier Design for Computer Monitors”, National
Semiconductor Application Note 1013.
Because of its high small signal bandwidth, the part may os-
cillate when it is used in a typical application with a preamp
in a monitor, if feedback occurs around the video amplifier
through the chassis wiring. To prevent this, leads to the input
circuit should be shielded, and input circuit wiring should be
spaced as far as possible from output circuit wiring. Power
should be removed as quickly as possible from an amplifier
that is oscillating, since power dissipation in the part is very
high in this mode and the part may be damaged if oscilla-
tions continue and the power supply can supply more than
250 mA.
TYPICAL APPLICATION
A typical application of the LM2405 is shown in Figure 9.
Used in conjunction with an LM1205, a complete video chan-
nel from monitor input to CRT cathode can be achieved. Per-
formance is satisfactory for all applications up to 1280x1024
non-interlaced, and pixel clock frequencies up to 130 MHz.
5 www.national.com
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