UCC2752D

Telecom Overview

The UCC2752 is a resonant ring generator controller designed for generating low-frequency, high-voltage sinusoidal signals in telephone ringing applications. It directly drives primary side switches in a push-pull resonant converter topology and transformer-coupled sampling switches on the secondary side. The device operates from a single 12V supply (VS12) and utilizes an internal regulated 5V reference (VDD). Primary switching frequency is fixed at approximately 89.489 kHz, derived from a 3.579545 MHz crystal. Sampling frequencies are offset by selectable amounts of 20 Hz, 25 Hz, or 50 Hz via FS0/FS1 pins to produce the alias ring signal. The UCC2752D package is a 16-pin SOIC.

Telecom Feature Summary

• Novel non-isolated open-loop topology for efficient generation of multi-line ring voltage
• Integrated cycle-by-cycle primary current limiting and off-hook detection capabilities
• Selectable output frequencies (20, 25, or 50 Hz) determined by hardware pin configuration
• Complementary DRV1 and DRV2 outputs with 50% duty cycle for primary switch driving

Telecom Applications

• Telephone line ring generators for up to 5 lines
• Resonant power stage controllers for AC signal generation
• Multi-line telephony systems requiring low component count

Telecom Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and environmental compliance. Ensure the design supports the required operating temperature range, as specifications vary between commercial and extended grades. Confirm availability status, as legacy components may have limited production support.

Telecom Selection Notes

Select the UCC2752 when a cost-effective, non-isolated solution for telephone ring generation is required. The device integrates necessary timing and drive functions, reducing external component count. Ensure the application can accommodate the fixed primary switching frequency and that the resonant tank components are matched to minimize distortion.

Telecom Part Context

The UCC2752 belongs to a family of controllers including the UCC3752, which shares identical functionality but differs in operating temperature ranges. These devices were originally developed to replace discrete implementations of ring generators, offering a consolidated solution for standard telephone network equipment.

Telecom Replacement Considerations

The UCC3752 is functionally equivalent to the UCC2752, differing primarily in the specified operating temperature range. Verify thermal requirements before substitution.