LM3411M5X-5.0/NOPB

Overview

The LM3411M5X-5.0/NOPB is a precision secondary regulator and driver manufactured by Texas Instruments, designed for use in offline flyback power supplies. It operates as a post-regulator to improve line and load regulation while maintaining low standby power consumption. The device features an adjustable switching frequency ranging from 20 kHz to 200 kHz and supports both analog and PWM dimming methods for LED applications. It utilizes a SOT-23-5 surface-mount package and includes integrated protection mechanisms such as thermal shutdown and open-loop detection.

Feature Summary

• Provides precise secondary-side voltage regulation to enhance overall power supply accuracy
• Supports flexible dimming control through combined analog and pulse-width modulation inputs
• Incorporates internal circuitry for open-loop fault detection to ensure system safety

Applications

• Offline flyback power supplies requiring tight output regulation
• LED lighting drivers with dimming capabilities
• Low standby power consumer electronics adapters

Procurement Notes

Verify the complete part number including the suffix to confirm the specific tape-and-reel packaging configuration. Ensure compatibility with the target PCB footprint for the SOT-23-5 package. Confirm that the design accounts for the required external components specified in the official datasheet for optimal performance.

Selection Notes

Select this component when high-precision secondary regulation is required in isolated converter topologies. It is suitable for designs needing low quiescent current during standby modes. Consider the operating temperature range and the need for external dimming interface compatibility before finalizing the bill of materials.

Part Context

This device belongs to the LM3411 family of precision secondary regulators. These components are engineered to address the limitations of primary-side regulation in flyback converters. They allow designers to achieve tighter voltage tolerances without relying on optocouplers or additional feedback windings.

Replacement Considerations

Direct replacements include LM3411AM5X-5.0/NOPB and LM3411-L variants. Verify pinout compatibility and electrical specifications against the original design requirements before substitution.