LM3411AM5-5.0/NOPB

Overview

The LM3411AM5-5.0/NOPB is a precision secondary regulator and driver manufactured by National Semiconductor, now part of Texas Instruments. It is designed for use in flyback power supplies to provide tight output voltage regulation on the secondary side. The device operates within an ambient temperature range of -40°C to 85°C and is housed in a compact SOT-23-5 surface-mount package.

Feature Summary

• Provides precise secondary-side voltage regulation to improve overall converter efficiency
• Integrates a high-voltage error amplifier and reference for accurate feedback control
• Features a low-quiescent current design to minimize standby power consumption

Applications

• Flyback power supply secondary regulation
• Adapter and charger circuits requiring tight load regulation
• Isolated DC-DC converter post-regulation stages

Procurement Notes

Verify that the ordering suffix /NOPB confirms lead-free compliance and RoHS adherence as specified by the manufacturer. Confirm the package marking matches the SOT-23-5 form factor. Ensure the supplier provides traceability documentation consistent with National Semiconductor or Texas Instruments standards for this specific variant.

Selection Notes

Select this component when secondary-side regulation is required to enhance line and load regulation performance in isolated topologies. It serves as a direct replacement for standard optocoupler-based feedback loops where higher accuracy and reduced component count are prioritized over cost sensitivity.

Part Context

This part belongs to the LM3411 family of precision secondary regulators. It complements primary-side controllers by closing the feedback loop on the secondary winding, thereby eliminating the need for optocouplers and additional bias windings in many flyback designs.

Replacement Considerations

The LM3411-L from Texas Instruments offers similar functionality with updated manufacturing processes. Verify pin compatibility and electrical specifications before substituting.