UC2861N

AC DC Converters, Offline Switchers Overview

The UC2861N is a resonant-mode power supply controller manufactured by Texas Instruments, originally under the Unitrode brand. It supports Full Bridge, Half Bridge, and Push-Pull topologies with two outputs. The device operates at a switching frequency of 1 MHz with a maximum duty cycle of 50%. It provides a 5 V output voltage and can deliver an output current of 1 A. Operating temperatures range from 0°C to +70°C. The component is housed in a PDIP-16 package for through-hole mounting.

AC DC Converters, Offline Switchers Feature Summary

• Supports resonant-mode control for Full Bridge, Half Bridge, and Push-Pull converter topologies
• Integrated oscillator capable of operating up to 1 MHz switching frequency
• Features internal logic limiting maximum duty cycle to 50 percent

AC DC Converters, Offline Switchers Applications

• Resonant-mode power supply designs
• High-frequency isolated DC-DC conversion systems
• Power stages requiring Full Bridge or Half Bridge configurations

AC DC Converters, Offline Switchers Procurement Notes

Verify the manufacturer designation as Texas Instruments, which acquired the Unitrode product line. Confirm the specific suffix 'N' corresponds to the PDIP-16 through-hole package variant. Ensure the datasheet aligns with the resonant-mode specifications rather than standard PWM controllers. Check RoHS compliance status for the specific production batch.

AC DC Converters, Offline Switchers Selection Notes

Select this component when designing resonant converters requiring integrated timing and duty-cycle limiting. Compare against other Unitrode/TI resonant controllers based on required topology support and switching frequency limits. Ensure the PDIP-16 package fits the thermal and spatial constraints of the target PCB layout. Verify input voltage ranges match the system requirements.

AC DC Converters, Offline Switchers Part Context

This part belongs to the UC3861/UC2861 family of resonant-mode controllers. These devices were historically significant in advancing zero-voltage switching techniques. The UC2861N represents the commercial temperature grade version of this integrated circuit family.

AC DC Converters, Offline Switchers FAQ

What switching topologies does the UC2861N support?

The UC2861N supports Full Bridge, Half Bridge, and Push-Pull converter topologies.

What is the maximum duty cycle limitation of the UC2861N?

The device includes internal logic that limits the maximum duty cycle to 50 percent.