ML4821CSX

Overview

The ML4821CSX is a Power Factor Correction (PFC) controller manufactured by onsemi, designed for average current mode operation. It integrates a 1 MHz switching frequency to optimize magnetics size and efficiency. The device operates within a supply voltage range of 12V to 18V and features a startup current of 600µA. Packaged in a 20-SOIC format with a width of 7.50mm, it supports surface-mount installation. The component functions within an operating temperature range of 0°C to 70°C and holds a Moisture Sensitivity Level (MSL) rating of 1, indicating unlimited floor life under standard conditions.

Feature Summary

• Implements average current mode control architecture for PFC applications
• Integrates a fixed 1 MHz switching frequency capability
• Designed for surface-mount installation in 20-SOIC packages

Applications

• Power factor correction circuits in power supplies
• Industrial power conversion systems
• Consumer electronics power adapters

Procurement Notes

Verify the part status carefully as this specific model may be classified as obsolete or discontinued by the manufacturer. Confirm availability through authorized distributors or secondary markets if active procurement is required. Ensure that any substitute components maintain compatibility with the original design specifications, including pinout and electrical characteristics, to avoid redesign efforts.

Selection Notes

Select this component when average current mode PFC control is required with a fixed high-frequency switching profile. The 20-SOIC package suits designs needing moderate pin counts for control and feedback loops. Consider the 12V-18V supply range during bias circuit design. Evaluate thermal management requirements based on the 70°C operating limit and SOIC thermal dissipation capabilities for the target application environment.

Part Context

This component belongs to the ML4821 family of power factor correction controllers produced by onsemi. It serves as a specialized integrated circuit for improving power quality in AC-DC conversion stages. The device represents a solution for managing harmonic distortion and reactive power in electronic loads, contributing to regulatory compliance in power supply designs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify cross-reference data directly from manufacturer resources before implementation.