LM5021MMX-1/NOPB

AC DC Converters, Offline Switchers Overview

The LM5021MMX-1/NOPB is an AC-DC current-mode PWM controller designed for offline flyback and forward converters. It operates within an input voltage range of 8 V to 30 V, supporting a maximum switching frequency of 1 MHz. The device features a maximum duty cycle limit of 80% and includes slope compensation. It utilizes a VSSOP-8 surface-mount package and functions across an operating temperature range from -40°C to +125°C.

AC DC Converters, Offline Switchers Feature Summary

• Ultra-low startup current minimizes power losses in high-voltage start-up networks
• Integrated slope compensation ensures stability in continuous conduction mode applications
• Skip cycle mode reduces standby power consumption for energy-efficient designs
• Direct opto-coupler interface simplifies feedback loop implementation

AC DC Converters, Offline Switchers Applications

• DCM/CCM flyback converters
• Industrial power conversion systems
• Smart meters and audio amplifier SMPS
• Building automation and white goods SMPS
• Isolated telecom power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'MMX' corresponds to the tape-and-reel packaging variant of the LM5021MM-1/NOPB component. Confirm that the '-1' designation aligns with the required 80% maximum duty cycle and slope compensation requirements for the target design. Ensure compatibility with the VSSOP-8 footprint during PCB layout validation.

AC DC Converters, Offline Switchers Selection Notes

Select this component when implementing efficient offline single-ended flyback or forward topologies requiring current-mode control. The integrated 0.7 A peak gate driver supports moderate load requirements without external drivers. Consider the 1 MHz oscillator capability for reducing passive component size while maintaining low propagation delays under 100 ns for precise timing control.

AC DC Converters, Offline Switchers Part Context

This part belongs to the LM5021 family of AC-DC controllers manufactured by Texas Instruments. It shares core architectural features with variants like the LM5021Q1 for automotive qualification but differs in packaging and specific duty cycle limits compared to other sub-models. The MMX suffix indicates a reel-packaged version of the MSOP/VSSOP-8 form factor.

AC DC Converters, Offline Switchers Replacement Considerations

LM5021MM-1/NOPB serves as the direct non-suffix equivalent in different packaging quantities.