ML4821CP

Overview

The ML4821CP is a high-performance, single-chip power factor controller designed for continuous conduction mode (CCM) boost PFC applications. It integrates a precision analog multiplier, a voltage error amplifier, and a current-mode PWM controller with an internal oscillator. The device supports universal AC input ranges and provides comprehensive protection features including overvoltage lockout, undervoltage lockout, and thermal shutdown to ensure reliable operation in offline power supplies.

Feature Summary

• Integrates a precision analog multiplier for accurate line and load regulation
• Features a built-in voltage error amplifier with reference output
• Includes a current-mode PWM controller with programmable frequency
• Provides robust protection mechanisms such as UVLO and thermal shutdown

Applications

• Offline power supplies
• Continuous conduction mode boost PFC converters
• Universal AC input power systems

Procurement Notes

Verify the package type and temperature grade against the specific suffix code on the datasheet. Confirm that the ordering part number matches the required commercial or industrial specifications. Check for any recent lifecycle status updates or alternative recommendations from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component for designs requiring integrated CCM PFC control without external multipliers. Ensure the operating frequency range aligns with the application's magnetic component design. Verify that the input voltage range and current sensing requirements fall within the device's specified operational limits for optimal performance.

Part Context

This component belongs to onsemi's portfolio of power management integrated circuits, specifically targeting efficient power conversion solutions. It is part of the broader category of controllers used in offline switching power supplies to improve efficiency and meet regulatory standards for harmonic distortion in AC-DC conversion systems.

Replacement Considerations

Consult official cross-reference lists for direct pin-compatible alternatives. Verify functional equivalence regarding control architecture and protection features when considering substitutes.