UCC3817D

Overview

The UCC3817D is a BiCMOS power factor preregulator controller manufactured by Texas Instruments. It operates within an industrial temperature range of 0°C to 70°C and utilizes a 16-pin SOIC package. The device integrates high-voltage startup circuitry, a current-mode PWM controller, and a multiplier for power factor correction. Key electrical characteristics include a wide input voltage operating range, programmable peak current limit, and integrated soft-start functionality to manage inrush currents during system initialization.

Feature Summary

• Integrates a high-voltage startup circuit to eliminate external start-up resistors
• Provides active power factor correction through analog multiplier functionality
• Features current-mode control with programmable peak current limiting
• Includes integrated soft-start capability for controlled inrush current management

Applications

• Offline power supplies requiring power factor correction
• Universal AC-DC converter designs
• Power factor preregulator stages in switch-mode power supplies

Procurement Notes

Verify the specific suffix 'D' indicates the standard plastic SOIC package variant. Confirm RoHS compliance status as manufacturing processes evolve. Ensure the ordering part number matches the exact pinout and thermal requirements of your PCB layout. Cross-reference the manufacturer's latest datasheet revision to confirm any updates to recommended operating conditions or application circuits.

Selection Notes

Select this component when designing offline power supplies that require integrated power factor correction without external multiplier chips. The BiCMOS technology offers a balance of speed and power handling suitable for universal input applications. Consider the 16-SOIC package constraints for thermal dissipation and board space. Evaluate the internal startup circuit benefits against external resistor solutions for efficiency improvements.

Part Context

This device belongs to the UCC3817 family of power factor preregulators. It is designed to replace discrete PFC solutions by integrating the multiplier, error amplifier, and PWM controller into a single chip. The family targets cost-sensitive, high-performance power supplies where power line harmonics must be minimized according to regulatory standards.

Replacement Considerations

Check for G4 suffix variants which denote lead-free and RoHS-compliant versions of the same functional device. Verify pin compatibility before substituting with other TI UC38xx series controllers, as pinouts may differ significantly between legacy and modern iterations.