Monolithic Triple 7.5 ns CRT Driver - National Semiconductor
Description
LM2445 Monolithic Triple 7.
5 ns CRT Driver
March 2003
LM2445 Monolithic Triple 7.
5 ns CRT Driver
General Description
The LM2445 is an integrated high voltage CRT driver circuit designed for use in color monitor 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 −20 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 9-lead TO-220 molded plastic power package.
See the Thermal Considerations section for more information.
Features
n Higher gain to match LM126X CMOS preamplifiers n 0V to 3.
75V input range n Stable with 0–20 pF capacitive loads and inductive peaking networks n Convenient TO-220 staggered lead package style n Maintains standard LM243X Family pinout which is designed for easy PCB layout
Applications
n 1024 x 768 displays up to 85 Hz refresh n Pixel clock frequencies up to 95 MHz n Monitors using video blanking
Schematic Diagram
20063701
FIGURE 1.
Simplified Schematic Diagram (One Channel)
© 2003 National Semiconductor Corporation
DS200637
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LM2445
Connection Diagram
20063702
Note: Tab is at GND
Top View Order Number LM2445TA
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2
LM2445
Absolute Maximum Ratings
3)
(Notes 1,
Machine Model
250V
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Supply Voltage (VCC) Bias Voltage (VBB) Input Voltage (VIN) Storage Temperature Range (TSTG) Lead Temperature (Soldering, < 10 sec.
) ESD Tolerance, Human Body Model 300˚C 2 kV +90V +16V 0V to 4.
5V −65˚C to +150˚C
Operating Ranges (Note 2)
VCC VBB VIN VOUT Case Temperature +60V to +85V +8V to +15V +0V to +3.
75V +15V to +75V −20˚C to +100˚C
Do not operate the part without a heat sink.
Electrical Characteristics...
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