Texas Instruments UCC28060EVM User Manual
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User's Guide

SLUU280B–May2007–RevisedJuly 2008

UCC28060EVM 300-WInterleaved PFCPre-Regulator

The UCC28060 is a dual-phase,transition-modePower Factor Correction (PFC)pre-regulator.The UCC28060EVM is an evaluation module (EVM) with a390-V,300-W,dc output that operates from a universal input of 85 VRMS to 265 VRMS and providespower-factorcorrection.

Throughout this document, the acronym EVM and the phrasesevaluation board andevaluation module are synonymous with the UCC28060EVM.

1Description

The pre-regulatoruses theUCC28060 PFC interleaved controller to shape the input current wave to providepower-factorcorrection. This device uses TI’sNatural Interleaving™ technology to interleave boost phases.

This user’s guide provides the schematic, List of Materials list, assembly drawing for a single-sidedprinted circuit board application, and testset-upinformation necessary to evaluate the UCC28060 in a typical PFC application.

2Thermal Requirements

This evaluation module will operate up to 300 W without external cooling in ambient tempatures of 25°C.

3Electrical Characteristics

Table 1 summarizes the electrical specifications of the UCC28060EVM.

Table 1. UCC28060EVM Electrical Specifications

PARAMETER

CONDITIONS

UCC28060EVM

 

UNITS

TYP

MAX

 

MIN

 

RMS input voltage (ac line)

 

85

265

VRMS

Output voltage, VOUT

 

390

 

V

Line frequency

 

47

63

Hz

Power factor (PF) at maximum load

 

0.9

 

 

Output power

 

 

300

W

Full load efficiency

AC line = 115 V

94%

 

 

AC line = 230 V

97%

 

 

 

 

 

Natural Interleaving is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

SLUU280B–May2007–RevisedJuly 2008

UCC28060EVM 300-WInterleaved PFCPre-Regulator

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Schematics

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4Schematics

Figure 1 andFigure 2 show the schematics for this EVM. See theList of Materials for specific values.

To evaluate inductor ripple currents, Jumpers JP8 and JP9 can be removed and replaced with current loops.

+ +

Figure 1. Interleaved PFC Power Stage

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UCC28060EVM 300-WInterleaved PFCPre-Regulator

SLUU280B–May2007–RevisedJuly 2008

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Schematics

 

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Figure 2. Controller Circuitry

SLUU280B–May2007–RevisedJuly 2008

UCC28060EVM 300-WInterleaved PFCPre-Regulator

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Test Setup and Power-Up/Power-DownInstructions

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5 Test Setup and Power-Up/Power-DownInstructions

WARNING

There are high voltages present on the pre-regulator.It should only be handled by experienced power supply professionals. To evaluate this board as safely as possible, the following test configuration should be used:

Connect an isolation transformer between the source and unit

Attach a voltmeter and a resistive or electronic load to the unit output before supplying power to the EVM.

A separate 13-Vbias supply is required to power the UCC28060 control circuitry. The unit will start up underno-loadconditions. However, for safety, a load should be connected to the output of the device before it is powered up. The unit should also never be handled while power is applied to it or when the output voltage is above50-Vdc. Refer toFigure 3 for a recommended test setup diagram.

CAUTION

There are very high voltages on the board. Components can and will reach temperatures greater than 100°C. Use caution when handling the EVM.

VM

0 to 300W Load

Isolation Transformer

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13V Bias Supply

Figure 3. Test Setup

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UCC28060EVM 300-WInterleaved PFCPre-Regulator

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