SG6961DZ

Overview

The SG6961DZ is an 8-pin boundary mode Power Factor Correction (PFC) controller IC designed for controlling PFC pre-regulators. It utilizes controlled on-time PWM to regulate output DC voltage and achieve natural power factor correction. The device features a multi-vector error amplifier for rapid transient response and precise output voltage clamping. Key electrical characteristics include a typical start-up current of 10µA, operating current under 4.5mA, and a maximum supply voltage of 20V. The gate output voltage is clamped at 16.5V.

Feature Summary

• Implements boundary mode control with controlled on-time PWM for natural power factor correction.
• Integrates a multi-vector error amplifier to ensure rapid transient response and precise output voltage regulation.
• Includes built-in feedback open-loop protection that disables the controller if the loop is opened.
• Features programmable maximum on-time to ensure safe operation during AC brownouts.

Applications

• Electric lamp ballasts
• AC-DC switching mode power converters
• Open-frame power supplies and power adapters
• Flyback power converters with Zero Current Switching (ZCS) or Zero Voltage Switching (ZVS)

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin alignment against the DIP-8 specification. Review the official datasheet for any specific handling requirements or environmental compliance certifications relevant to the manufacturing batch.

Selection Notes

Select this controller for applications requiring low input current Total Harmonic Distortion (THD) and efficient boundary mode operation. Consider its low start-up and operating currents for energy-sensitive designs. Ensure the application benefits from the integrated cycle-by-cycle current limiting and leading-edge blanking capabilities for robust performance.

Part Context

The SG6961 belongs to the SG69 series of power management components manufactured by Fairchild Semiconductor, now part of onsemi. This series focuses on power factor correction and flyback control solutions. The SG6961 specifically targets single-stage PFC controllers, offering a compact solution for improving power efficiency in AC-DC conversion systems.

Replacement Considerations

The SG6961DY is a documented variant within the same family. Verify pin compatibility and functional equivalence before substitution. Consult the official datasheet to confirm that all electrical parameters and feature sets align with the design requirements.