MC33368D

Overview

The MC33368D is a high-voltage GreenLine power factor controller designed for offline power supply applications. It functions as a boost preconverter optimized for low-power, high-density designs requiring minimal board area and component count. The device integrates a high-voltage startup circuit, reducing power dissipation compared to resistor bootstrapped alternatives. Key internal blocks include a one-quadrant multiplier, zero current detector, transconductance error amplifier, and a CMOS driver for MOSFETs. It operates within a supply voltage range of 10V to 16V and supports a starting current of 16 mA.

Feature Summary

• Lossless off-line startup capability integrated into the high-voltage control block
• Watchdog timer mechanism to initiate output switching operations
• One-quadrant multiplier ensures line current follows instantaneous line voltage
• Zero current detector facilitates critical conduction mode operation

Applications

• Low power offline power supplies
• High density power supply designs
• Boost preconverter circuits in AC-DC converters

Procurement Notes

Verify RoHS compliance status carefully, as non-G suffix versions may not meet current environmental regulations. Confirm package availability, as standard tape-and-reel options might differ from tube packaging for this specific part number. Check for obsolescence notices or PCN documents regarding manufacturing changes before finalizing procurement plans.

Selection Notes

Select this component for applications prioritizing reduced component count and board space in low-power PFC stages. Ensure the design accommodates the 16-SOIC narrow body package constraints. Verify that the external MOSFET driver requirements align with the internal CMOS driver capabilities provided by the IC.

Part Context

Part of the onsemi GreenLine family, the MC33368D targets cost-effective solutions for compact power supplies. It serves as an alternative to discrete PFC implementations, offering integrated protection features like output overvoltage comparison and cycle-by-cycle current limiting within a single chip solution.

Replacement Considerations

MC33368DR2G is a verified lead-free replacement variant within the same functional family.