LM2405T

Overview

The LM2405T is a monolithic triple CRT driver circuit designed for color monitor applications. It integrates three high input impedance, wide band amplifiers that directly drive RGB cathodes with an internal gain of -14. The device operates within a supply voltage range of +60V to +85V and supports a bias voltage from +8V to +15V. It features typical rise and fall times of 7 ns with an 8 pF load and handles capacitive loads between 0 pF and 20 pF. Packaged in an 11-lead TO-220 molded plastic power package, it is suitable for display resolutions up to 1280 x 1024 non-interlaced.

Feature Summary

• Integrates three high input impedance, wide band amplifiers for direct RGB cathode driving
• Internally set gain of -14 per channel with stable operation across 0 pF to 20 pF capacitive loads
• Supports pixel clock frequencies up to 130 MHz for high-resolution displays
• Includes built-in ESD protection diodes and requires external arc protection components

Applications

• CRT driver for 1280 x 1024 (Non-interlaced) and XGA display resolution color monitors
• Monitors utilizing video blanking techniques
• SVGA and XGA display applications requiring high bandwidth amplification

Procurement Notes

Verify the manufacturer origin as National Semiconductor or Texas Instruments, noting the acquisition history. Confirm the package type is the 11-lead TO-220 molded plastic power package. Ensure the part meets the required operating temperature and voltage specifications for your specific CRT application design.

Selection Notes

Select this component for applications requiring direct drive of CRT cathodes with high bandwidth. Ensure adequate heat sinking is provided, as the device cannot operate without it due to significant power dissipation. Verify that the PCB layout minimizes stray capacitance and includes necessary arc protection components like clamp diodes and peaking inductors.

Part Context

The LM2405 is a high voltage monolithic triple CRT driver suitable for SVGA and XGA display applications. It features +80V operation and low power dissipation characteristics. The IC is housed in an industry-standard 11-lead TO-220 molded plastic power package, designed for easy PCB layout and efficient thermal management in monitor designs.

Replacement Considerations

No public confirmed substitute part numbers are available in the source material.