UCC28083DR

AC DC Converters, Offline Switchers Overview

The UCC28083DR is an 8-pin current-mode push-pull PWM controller manufactured by Texas Instruments. It supports switching frequencies ranging from 50 kHz to 1 MHz and features a maximum duty cycle of 50%. The device operates with a supply voltage between 9 V and 15 V, drawing a typical supply current of 2.5 mA. It provides two output drivers capable of sourcing 1 A each, with rise and fall times of 25 ns. Designed for half-bridge and push-pull topologies, it functions within a temperature range of -40°C to 85°C and is housed in a SOIC-8 surface-mount package.

AC DC Converters, Offline Switchers Feature Summary

• Integrates programmable slope compensation to ensure stable operation across varying transformer conditions.
• Features adjustable switching frequency via an external resistor to optimize efficiency and component size.
• Includes under-voltage lockout (UVLO) circuitry to prevent malfunction during power-up and power-down sequences.

AC DC Converters, Offline Switchers Applications

• High-efficiency DC/DC converters utilizing push-pull topology
• Half-bridge power supply designs
• Universal input adapter applications

AC DC Converters, Offline Switchers Procurement Notes

Verify the suffix 'D' confirms the SOIC-8 package variant when ordering. Confirm that the specific revision level matches the design requirements for slope compensation characteristics. Ensure the operating environment stays within the specified -40°C to 85°C range for reliable performance. Cross-reference the pinout with the official datasheet to avoid layout errors during PCB assembly.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring precise current-mode control in push-pull or half-bridge configurations. It is suitable for applications needing flexible frequency adjustment up to 1 MHz. Consider the 50% maximum duty cycle limitation when designing transformer turns ratios. Evaluate the thermal dissipation capabilities relative to the SOIC-8 package constraints for high-power implementations.

AC DC Converters, Offline Switchers Part Context

This part belongs to the UCC2808x series of current-mode PWM controllers. It shares functional similarities with the UCC28084 but differs in specific electrical parameters and package options. The DR suffix indicates tape-and-reel packaging, distinguishing it from the tube-packaged UCC28083D. It serves as a core control element in isolated power conversion systems.

AC DC Converters, Offline Switchers Replacement Considerations

UCC28084DR: Similar push-pull controller with comparable specifications; verify exact electrical parameter alignment.

AC DC Converters, Offline Switchers FAQ

What is the maximum duty cycle supported by the UCC28083DR?

The device supports a maximum duty cycle of 50%, which is fixed to prevent transformer saturation in push-pull and half-bridge topologies.

How is the switching frequency adjusted in the UCC28083DR?

The switching frequency is set externally using a single resistor connected to the RT pin, allowing for a range between 50 kHz and 1 MHz.