UC3855ADWG4

Overview

The UC3855ADWG4 is a high-performance power factor preregulator integrated circuit manufactured by Texas Instruments. It utilizes average current mode control to drive boost PWM converters, achieving near unity power factor operation. The device operates within a supply voltage range of 8 V to 35 V and supports switching frequencies from 100 kHz to 500 kHz. It features a maximum duty cycle of 50% and provides output currents up to 500 mA with a regulated output voltage of 5.1 V. The component is housed in a 20-SOIC package and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• Implements fixed frequency average current mode control to minimize line current distortion
• Controls boost PWM topology to achieve near unity power factor
• Designed for high performance power factor preregulation applications

Applications

• Power factor correction (PFC) stages in AC-DC converters
• High performance power factor preregulators
• Average current mode PFC controllers

Procurement Notes

Verify the specific suffix 'DWG4' against official Texas Instruments documentation to confirm the exact package type, temperature grade, and lead-free status. Ensure compatibility with your PCB footprint for the 20-SOIC package. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this component when designing systems requiring average current mode control for improved line current quality. It is suitable for applications needing near unity power factor without complex external compensation networks. Consider the 20-SOIC package constraints and the 500 kHz maximum switching frequency limit when determining thermal management and filter component sizes.

Part Context

This part belongs to the UC3855A/B series of high-performance power factor preregulators. These devices are engineered to address the trend toward higher power densities in power converters by enabling efficient operation at elevated switching frequencies while managing system losses.

Replacement Considerations

The UC3855ADW is the non-green equivalent. Verify if the RoHS-compliant 'G4' suffix is required for your assembly process.