LM5021NA-1

AC DC Converters, Offline Switchers Overview

The LM5021NA-1 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 boost or flyback topology with a maximum switching frequency of 500 kHz. The device features a maximum duty cycle of 80% and draws a typical operating supply current of 2.5 mA. It is housed in an MDIP-8 package and supports operation across a 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
• Skip cycle mode reduces standby power consumption for energy-efficient applications
• Integrated peak current gate driver with direct opto-coupler interface
• Includes slope compensation and hiccup mode overload protection

AC DC Converters, Offline Switchers Applications

• DCM/CCM flyback converters
• Industrial power conversion systems
• SMPS 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 'NA' against the manufacturer's official documentation to confirm exact packaging and tape-and-reel specifications. Ensure that the component meets all required environmental standards and lead-free compliance criteria for the intended deployment region before finalizing procurement orders.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for designs requiring current-mode control with integrated slope compensation. The fixed 80% maximum duty cycle distinguishes it from other variants. Ensure the design accommodates the specified 8 V to 30 V input range and utilizes the PDIP-8 package form factor for through-hole implementation.

AC DC Converters, Offline Switchers Part Context

This component belongs to the LM5021 family of AC-DC PWM controllers. It shares core architecture with standard LM5021 devices but includes specific internal limits, such as the 80% duty cycle cap. The 'NA' designation typically indicates a specific commercial grade or packaging variant within the Texas Instruments portfolio.

AC DC Converters, Offline Switchers Replacement Considerations

The LM5021-2 serves as a functional substitute if a 50% maximum duty cycle limit is acceptable for the application. Verify pinout compatibility and ensure the replacement part supports the required flyback topology and current-mode control requirements.