LM5021MMX-2

AC DC Converters, Offline Switchers Overview

The LM5021MMX-2 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, utilizing a VSSOP-8 surface-mount package. The device supports switching frequencies up to 1 MHz and features a maximum duty cycle limit of 50%. Key electrical characteristics include a startup current of 25 µA maximum, a quiescent operating current of 2.5 mA, and a peak gate driver output current of 0.7 A. It functions reliably across an extended temperature range from -40°C to +125°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 0.7 A peak current gate driver with direct opto-coupler interface capability.
• Features skip cycle mode to minimize standby power consumption in light-load conditions.
• Includes slope compensation and adjustable soft-start for stable operation.
• Provides hiccup mode protection for continuous overload scenarios.

AC DC Converters, Offline Switchers Applications

• Discontinuous conduction mode (DCM) or continuous conduction mode (CCM) flyback converters
• Industrial power conversion systems
• Switching mode power supplies for smart meters and audio amplifiers
• Building automation and white goods SMPS
• Isolated telecom power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'MMX-2' against the manufacturer's official datasheet to confirm the 50% duty cycle limitation. Ensure the ordering part number matches the required VSSOP-8 tape-and-reel packaging configuration. Cross-reference the revision history to ensure compatibility with current design specifications.

AC DC Converters, Offline Switchers Selection Notes

Select this component when a lower maximum duty cycle of 50% is required compared to the standard LM5021-1 variant. It is suitable for applications prioritizing low standby power through skip cycle mode. Consider the integrated slope compensation and hiccup protection features for robust overload handling in isolated power designs.

AC DC Converters, Offline Switchers Part Context

The LM5021 series comprises AC-DC current-mode PWM controllers for efficient offline power conversion. The LM5021MMX-2 specifically denotes the VSSOP-8 surface-mount package variant with a 50% duty cycle limit. This distinguishes it from the LM5021-1, which offers an 80% duty cycle limit and additional slope compensation.

AC DC Converters, Offline Switchers FAQ

What is the maximum duty cycle for the LM5021MMX-2?

The LM5021MMX-2 has a maximum duty cycle limit of 50%, distinguishing it from the LM5021-1 which allows up to 80%.

Does the LM5021MMX-2 include slope compensation?

No, slope compensation is a feature exclusive to the LM5021-1 variant; the LM5021MMX-2 does not include this function.