LM2412T/NOPB

Overview

The LM2412T/NOPB is a monolithic triple CRT driver circuit designed for high-resolution color monitor applications. It integrates three high input impedance, wideband amplifiers that directly drive RGB cathodes with an internally set gain of -14. The device operates on +80V and +12V supplies, delivering a typical rise/fall time of 2.8 ns with an 8 pF load at 40 Vpp output swing. It supports pixel clock frequencies up to 200 MHz and display resolutions up to 1600 x 1200 at 85 Hz refresh rates.

Feature Summary

• Integrates three high input impedance, wideband amplifiers with internally set gain of -14
• Provides fast transient response with typical rise and fall times of 2.8 ns
• Capable of driving CRT capacitive loads as well as resistive loads
• Operates stably with 0-20 pF capacitive loads and inductive peaking networks

Applications

• CRT driver for color monitors with display resolutions up to 1600 x 1200 at 85 Hz refresh rate
• Video channel design supporting pixel clock frequencies up to 200 MHz
• High resolution display applications requiring direct RGB cathode drive

Procurement Notes

Verify the component datasheet (SNOS511A) to confirm current electrical characteristics and absolute maximum ratings. Ensure proper heat sinking is implemented, as operation without a heatsink exceeds safe case temperature limits. Validate power supply bypassing requirements using specified capacitor values to prevent oscillation. Confirm compatibility with associated video preamps like the LM2202 for complete signal chain integration.

Selection Notes

Select this component for designs requiring a low-power alternative to the LM2402 family while maintaining similar bandwidth. It is suitable for systems needing direct CRT cathode drive without external buffering. Consider thermal management capabilities when choosing this part, as it requires a TO-220 package with adequate heat dissipation. Verify that the application environment stays within the specified operating voltage ranges for optimal performance.

Part Context

The LM2412 belongs to the LM240X family of CRT drivers, manufactured by Texas Instruments following its acquisition of National Semiconductor. It utilizes an industry-standard 11-lead TO-220 molded plastic power package. This component serves as a specialized high-voltage amplifier solution for legacy and industrial display technologies requiring precise RGB signal amplification.

Replacement Considerations

LM2402T/NOPB