LM5021MMX-2

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The LM5021MMX-2 is an integrated, positive voltage converter regulator and switching controller for offline, low-power applications. It is typically used in the power supply of low power home appliances, battery-powered systems, mobile devices, and telecommunications equipment. This device is a dual-channel, high voltage controller integrated with two independent power blocks. It offers a versatile, simple and economical solution for self-powered systems, from a few watts to several hundred watts.

Working Principle

The LM5021MMX-2 integrates two fully functional, independent power supply channels capable of operating efficiently and independently in parallel or discretely. Each channel supports an inductive PFC converter, a DC to DC buck converter, and a boost converter. The PFC controller provides active power factor correction, line voltage regulation, voltage waveform shaping and inductor current ripple minimization. The DC-DC buck controller integrates a VCOMP comparator and a DMOS switch driver gate with a fixed 2MHz switching frequency set by the PWM Feedback Divider. The feedback loop is regulated independently for each channel. The boost controller allows for synchronized ramp-up of the output in order to reduce capacitive stress and has an adjustable minimum-on-time to minimize start-up current.

Features

The LM5021MMX-2 offers several important features, including:

• High and low-side supply voltage monitoring
• Adaptive over-voltage protection for enhanced system reliability
• Over-current protection and output current sense
• Independent soft-start capabilities and turn on delay
• Prebias startup mode protects against excessive consumption
• Selectable high-side and low-side outputs
• Full-featured OVP, OCP, UCH, SWO and OTP functions
• Fault status indication output
• A negative duty cycle shutdown mode

Applications

The LM5021MMX-2 is suitable for usage in various applications requiring power factor correction and fast response to variations in the AC line input voltage. These include adapters for consumer electronics such as digital cameras, Blu-Ray players, digital TVs, and more. Other applications include Uninterrupted Power Supplies (UPSs), Charge Pumps, Multi-Channel Power Sources, Dimmable Lighting applications, Motor Drives, and grid-tied inverters.

Conclusion

The LM5021MMX-2 is a versatile, high-voltage switching regulator and power factor correction IC that can be used in a variety of low-power applications. It features two independent power blocks, integrated feedback loops, prebias startup mode, a wide range of protections and fault status indications, and is able to operate efficiently and independently in parallel or discretely.

This application field and working principle of the LM5021MMX-2 provide cost- efficient solutions and ensure regulatory compliance, safeguarding the performance and reliability of the applications in which it is implemented.

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