Datasheet

User's Guide

SLUU429B–June 2010–Revised December 2010

Half-Bridge DC-to-DC Converter With Primary-Side Control

1 Introduction

This EVM is to help evaluating UCC28250 PWM device with primary-side control in DC-to-DC symmetrical

half-bridge converter topology. The targeted application is telecom module design with nominal 48-V input.

UCC28250 is a PWM controller that can be used for primary-side control or secondary-side control. In this

EVM, the UCC28250 is placed at primary side to make primary-side control.

2 Description

The EVM is a 75-W symmetrical half-bridge DC-to-DC converter that converts 36-V to 72-V DC to a

regulated output voltage 3.3 V and maximum 23-A load current.

2.1 Typical Applications

• Telecom power supplies with primary-side control

• Server systems

• Datacom

• DSP’s, ASIC’s, and FPGA’s

2.2 Features

• Start up directly from telecom telecom input voltage 36-V to 72-V DC.

• Regulated output voltage 3.3 V with maximum 23-A load current.

• Telecom basic isolation from primary to secondary 1500 V.

• Output voltage regulation from no load to full load, and from low line to high line.

• Control driven synchronous rectifier.

• All surface mount components, double sided close to form factor of quarter brick.

• Voltage mode control.

• Remote Enable ON/OFF Function and manual switch.

• Non-latching input over voltage protection.

• Non-latching input under voltage protection.

• Hiccup over current protection.

• Test points to facilitate the devices evaluation.

Half-Bridge DC-to-DC Converter With Primary-Side Control SLUU429B–June 2010–Revised December 2010

Submit Documentation Feedback