SG6901ASZ

Overview

The SG6901ASZ is a highly integrated Power Factor Correction (PFC) and Flyback PWM controller designed for AC-DC power supplies. It combines CCM PFC control with flyback regulation in a single IC, enabling compact designs with high efficiency. The device supports universal input voltage ranges and features advanced protection mechanisms including over-voltage, over-current, and thermal shutdown. Packaged in a 20-SOIC format, it integrates startup circuitry and soft-start functions to ensure reliable operation during power-up sequences.

Feature Summary

• Integrates continuous conduction mode (CCM) PFC and flyback PWM control functions within a single chip architecture
• Includes built-in startup current source and soft-start capability to manage inrush currents and voltage ramping
• Provides comprehensive protection features such as cycle-by-cycle current limiting, output over-voltage protection, and thermal overload shutdown

Applications

• Universal input AC-DC adapters for consumer electronics
• Battery chargers for mobile devices and laptops
• High-efficiency flyback power supplies with active PFC
• LED lighting drivers requiring power factor correction

Procurement Notes

Verify the suffix 'SZ' indicates lead-free and halogen-free compliance per RoHS standards. Confirm the package type matches the required 20-SOIC footprint with 7.50mm width. Ensure the manufacturer designation aligns with onsemi or Fairchild Semiconductor specifications for pinout compatibility.

Selection Notes

Select this component when a single-chip solution for both PFC and secondary-side regulation is required to reduce bill of materials count. Ideal for applications demanding high power factor and low standby power consumption without separate controllers. Evaluate thermal performance requirements due to integrated power stage driving capabilities.

Part Context

This part belongs to the SG6901 series of mixed-signal power management ICs. It is commonly used in medium-power AC-DC conversion systems where size constraints and efficiency targets necessitate integrated control solutions. The device represents an evolution from discrete PFC and PWM controller combinations.

Replacement Considerations

Direct substitutes include the SG6901A variant which shares identical functional specifications. Cross-reference with SG6846A series if enhanced standby power optimization is prioritized over full integration. Verify pin-to-pin compatibility before substitution.