LM2425TE/NOPB

Overview

The LM2425TE/NOPB is a monolithic triple-channel high-voltage CRT driver designed for Direct View Tube (DTV) applications. It features three wide-band amplifiers with an internal gain of -53 V/V, capable of driving RGB cathodes directly. The device operates with a supply voltage up to +230V and supports a 0V to 5V input range. It delivers a 10 MHz bandwidth at 130V peak-to-peak output swing and can achieve up to 170V peak-to-peak swing with AC coupling. The IC is housed in an 11-lead TO-220 package optimized for high-voltage spacing.

Feature Summary

• Triple channel architecture with fixed internal gain for direct CRT cathode drive
• High voltage operation supporting up to 230V supply and 220V typical operation
• Stable performance with capacitive loads ranging from 0 pF to 20 pF
• Industry standard TO-220 package with staggered thin leads for enhanced spacing

Applications

• AC coupled DTV applications
• DC coupled DTV applications
• Direct Video Driver circuits for CRT displays

Procurement Notes

Verify the component is the LM2425TE/NOPB variant, which indicates lead-free plating compliance. Confirm the package is the 11-lead TO-220 style. Ensure the source documentation matches the National Semiconductor datasheet DS201241. Check for any specific handling requirements regarding high-voltage components and ESD sensitivity during storage and installation.

Selection Notes

Select this component when a high-voltage, triple-channel driver is required for CRT-based display systems. It is suitable for designs needing a fixed gain of -53 V/V and operation with standard 0V to 5V video inputs. Consider the thermal management requirements, as the device dissipates significant power and requires a heat sink to maintain case temperature below 110°C under full load conditions.

Part Context

The LM2425 belongs to the LM242X family of CRT drivers developed by National Semiconductor, now part of Texas Instruments. It is specifically engineered for Direct View Tube technologies, offering integrated protection and biasing features. The NOPB suffix denotes lead-free manufacturing, aligning with environmental compliance standards for electronic components used in consumer and professional display equipment.

Replacement Considerations

Consult the LM242X family datasheets for potential substitutes. Verify pin compatibility and electrical specifications before replacing. No specific cross-reference part numbers are confirmed in the provided documentation.

FAQ

What is the maximum supply voltage for the LM2425?

The absolute maximum supply voltage (VCC) is +250V, while the operating rating allows for up to +230V.

How does load capacitance affect the rise time of the LM2425?

Increasing the load capacitance from 10 pF to 20 pF adds approximately 12 ns to both the rise and fall times.

Is external gain setting required for the LM2425 channels?

No, each channel has its gain internally set to -53 V/V, eliminating the need for external feedback resistors for gain configuration.