ML4821CS

Overview

The ML4821CS is a Power Factor Correction (PFC) controller manufactured by onsemi, designed for average current mode control applications. It operates with a fixed switching frequency of 1MHz and supports a supply voltage range of 12V to 18V. The device features a low startup current of 600µA and functions within an operating temperature range of 0°C to 70°C. It is housed in a 20-SOIC package with a width of 7.50mm. The component is classified as obsolete or end-of-life status.

Feature Summary

• Implements average current mode control for power factor correction
• Operates at a fixed 1MHz switching frequency
• Features low startup current consumption

Applications

• Power factor correction circuits
• Average current mode PFC controllers

Procurement Notes

Verify the current availability status as the part is listed as obsolete. Confirm compatibility with existing designs due to potential supply chain changes. Check for alternative sources or equivalent components if immediate procurement is required. Ensure the 20-SOIC package dimensions match the target PCB layout constraints.

Selection Notes

Select this component for applications requiring average current mode PFC control with a fixed 1MHz frequency. Consider the 12V-18V supply range and 0°C to 70°C operating temperature limits. The 20-SOIC package size must fit the design footprint. Note that the part is obsolete, so long-term supply may be limited.

Part Context

The ML4821CS belongs to the ML4821 family of PFC controllers from onsemi. It is specifically designed for average current mode operation. The CS suffix indicates the commercial temperature grade and SOIC package variant. It is part of onsemi's broader portfolio of power management integrated circuits.

Replacement Considerations

The ML4824CS1 is documented as a comparable industry-standard PFC IC from onsemi. Verify pinout and functional compatibility before substitution. No other specific substitute part numbers are confirmed in the provided data.