MC33368DG

Overview

The MC33368DG is a high-voltage GreenLine power factor controller designed for critical conduction mode (CRM) boost preconverters in offline power supplies. It integrates a one-quadrant multiplier, zero-current detector, and transconductance error amplifier to ensure line current follows instantaneous voltage. Key electrical parameters include a supply voltage range of 10V to 16V, an operating temperature range from -25°C to +125°C, and a startup current of 16 mA. The device utilizes a narrow-body SOIC-16 package with a width of 3.90 mm.

Feature Summary

• Lossless off-line startup utilizing integrated high-voltage circuitry to reduce power dissipation compared to resistor bootstrapped designs.
• Critical conduction mode operation enabled by a zero-current detector and programmable output switching frequency clamp.
• Integrated watchdog timer initiates output switching while leading edge blanking provides noise immunity.

Applications

• Low power offline power supplies requiring minimum board area
• High density power supply designs with reduced component count
• Boost preconverter applications in AC/DC conversion systems

Procurement Notes

Verify the specific suffix 'DG' against the manufacturer's official datasheet to confirm the package type and RoHS compliance status. Confirm availability as this component may be subject to obsolescence notices or production changes. Ensure the ordering information matches the exact pinout and thermal characteristics required for the target PCB layout.

Selection Notes

Select this component for applications prioritizing low power dissipation during startup and compact form factors due to the narrow-body SOIC package. The integration of high-voltage startup and CRM control reduces external component count. Verify that the input voltage range and thermal requirements align with the specified -25°C to +125°C operating temperature limits.

Part Context

The MC33368DG belongs to onsemi's GreenLine family of power factor controllers. This series is optimized for efficiency and size in low-power offline applications. The device functions as a boost preconverter, integrating multiple control loops and protection features typically found in discrete solutions into a single monolithic IC.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult the manufacturer's official replacement guide for cross-reference data.