UC3853NG4

Overview

The UC3853NG4 is a high power factor preregulator manufactured by Texas Instruments, designed for single-phase power factor correction applications. It operates within an ambient temperature range of 0°C to 70°C and utilizes an 8-pin PDIP package. The device supports average current mode control with a practical operating frequency up to 0.115 MHz. Key electrical parameters include a startup current of 0.25 mA, an operating supply voltage maximum of 40 V, and an operating supply current of 10 mA. Undervoltage lockout thresholds are set at 11.5 V for turn-on and 9.5 V for turn-off.

Feature Summary

• Implements average current mode control for precise power factor correction
• Includes overvoltage protection (OVP) functionality
• Designed as a high power factor preregulator for single-phase systems

Applications

• Single-phase power factor correction circuits
• High power factor preregulator designs
• Average current mode controlled power supplies

Procurement Notes

Verify the specific suffix NG4 indicates the lead-free PDIP-8 package variant when sourcing. Confirm the component matches the UC3853 family specifications regarding undervoltage lockout thresholds and gate drive capabilities. Ensure the supplier provides documentation confirming compliance with RoHS standards and the specified commercial temperature range of 0°C to 70°C.

Selection Notes

Select this component for applications requiring single-phase PFC with average current mode control. Consider the 8-pin PDIP package for through-hole assembly requirements. Evaluate the 40 V maximum operating supply voltage against system rail constraints. Verify that the 0.115 MHz maximum operating frequency aligns with the intended switching speed and electromagnetic interference requirements of the design.

Part Context

The UC3853 belongs to the UC385x series of high power factor preregulators from Texas Instruments. This series focuses on improving input power factor in AC-DC conversion stages. The UC3853 specifically targets single-phase applications using average current mode control techniques to achieve efficient power factor correction without complex compensation networks.

Replacement Considerations

The UC3853DTRG4 is a documented equivalent offering the same functional characteristics in a surface-mount SOIC-8 package. Designers requiring through-hole compatibility should verify pin-out consistency if substituting with other PDIP variants.