UCC2750DWTR

Telecom Overview

The UCC2750DWTR is a Source Ringer Controller manufactured by Texas Instruments in an SOIC-28 package. It provides control for flyback-based four-quadrant amplifier topologies, featuring an onboard sine wave reference with low total harmonic distortion. The device supports selectable ringing frequencies of 20Hz, 25Hz, and 50Hz via frequency-select pins. It operates from a single 5V supply (VDD) and includes a charge-pump circuit generating up to 14V at VCP. Electrical characteristics specify a typical oscillator accuracy of 128 kHz, output driver rise/fall times of 50 ns to 100 ns, and a maximum PWM duty cycle of 50%. The component functions within a temperature range of -40°C to +85°C.

Telecom Feature Summary

• Provides complete control and drive solution for four-quadrant flyback ring generator circuits
• Features an onboard sine wave reference generator with programmable frequencies and low total harmonic distortion
• Includes internal error amplifiers, DC current limiting, and a charge-pump circuit for gate drive voltage generation

Telecom Applications

• Four-quadrant flyback-based telephone ring signal generators
• Telecom equipment requiring bidirectional power transfer and AC signal superimposed on DC offset
• Circuits requiring synchronous rectification during positive power flow

Telecom Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging quantity and environmental compliance status. Ensure the procurement channel sources directly from authorized distributors or the manufacturer to guarantee authenticity. Confirm that the delivered components match the active marketing status indicated in the latest datasheet revision history.

Telecom Selection Notes

Select this controller when designing isolated flyback converters for telecom applications requiring precise sine wave generation and four-quadrant operation. The device requires an external 32kHz crystal for internal frequency division. Designers must account for the 50% maximum PWM duty cycle limitation inherent to the triangular ramp oscillator. External compensation components are required for the error amplifier loop stability across all operating modes.

Telecom Part Context

The UCC2750DWTR belongs to the UCC2750/UCC3750 family of source ringer controllers produced by Texas Instruments. This series is specifically engineered for telecommunications infrastructure, enabling the generation of standardized ringing signals. The DWTR variant denotes the tape-and-reel packaging format suitable for automated surface-mount assembly processes.

Telecom Replacement Considerations

The UCC3750 is the industrial-grade equivalent within the same functional family. Verify pin compatibility and thermal performance requirements before substitution. No other direct cross-model replacements are documented in the provided datasheet.