MC33262D

Overview

The MC33262D is an active power factor controller from the MC332 series, designed for pre-converters in electronic ballasts and offline power supplies. It operates in critical conduction mode (CRM) using a PDIP package with 8 pins. The device supports a supply voltage range of 7V to 36V and functions within a temperature range of -40°C to 105°C. Key electrical parameters include a start-up supply current of 0.25mA, a maximum source current of 10μA, and a maximum reverse current of 500,000μA.

Feature Summary

• Features a single-quadrant multiplier that maintains linear transmission curves to reduce line current distortion.
• Includes a zero-current detector that triggers the next conduction time when inductor current reaches zero.
• Integrates a transconductance error amplifier with stable gain characteristics across temperature variations.
• Provides comprehensive protection mechanisms including over-voltage comparison, under-voltage lockout, and cycle-by-cycle current limiting.

Applications

• Active power factor correction for electronic ballasts
• Pre-converter stages in offline power supplies
• Critical conduction mode (CRM) PFC designs

Procurement Notes

Verify the specific suffix 'D' confirms the SOIC or PDIP variant as listed in official datasheets, noting potential confusion with other package types like DR2G. Confirm RoHS compliance status against the latest manufacturer documentation, as older revisions may differ. Ensure the operating temperature range meets the application requirements of -40°C to 105°C. Cross-reference the pinout diagram to match the 8-pin configuration with the target PCB layout. Validate that the component is not obsolete by checking current production status with onsemi.

Selection Notes

Select this component for applications requiring critical conduction mode operation to minimize output rectifier reverse recovery requirements. The internal fast-start circuit reduces startup delay, making it suitable for systems requiring immediate drive switching. The integrated RC filter helps attenuate high-frequency noise in current waveforms. Designers must ensure the external compensation network aligns with the transconductance amplifier's typical gain of 100 mhos for stable bandwidth.

Part Context

The MC33262 belongs to the MC332 family of power factor controllers manufactured by onsemi. It is functionally similar to the MC34262, which shares the same core architecture but may differ in temperature ratings or packaging. Both devices are designed to improve power factor and reduce harmonic content in pre-converter stages. The MC33262 specifically offers extended industrial temperature capabilities compared to commercial variants.

Replacement Considerations

The L6561D from STMicroelectronics is documented as a similar replacement part for the MC33262 series. Verify pin compatibility and control loop stability when substituting.