Texas Instruments UCC38500EVM Manuale utente

SLUU068C

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User’s Guide

-2

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User’s Guide

February 2005 Power Management Products

SLUU068C

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,

in which TI products or services are used. Information published by TI regarding third−party products or services

does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.

Use of such information may require a license from a third party under the patents or other intellectual property

of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of information in TI data books or data sheets is permissible only if reproduction is without

alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction

of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for

such altered documentation.

Resale of TI products or services with statements different from or beyond the parameters stated by TI for that

product or service voids all express and any implied warranties for the associated TI product or service and

is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION

PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided

may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective

considerations, including product safety measures typically found in the end product incorporating the goods.

As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic

compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned

within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE

WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,

IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY

PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user

indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products

received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction

of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic

discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE

TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not

exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM

User’s Guide prior to handling the product. This notice contains important safety information about temperatures

and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 85 V to 265 V and the output

voltage of 12 V +/− 5%.

Exceeding the specified input range may cause unexpected operation and/or irreversible

damage to the EVM. If there are questions concerning the input range, please contact a TI

field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or

possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to

connecting any load to the EVM output. If there is uncertainty as to the load specification,

please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than

50°C. The EVM is designed to operate properly with certain components above 50°C as long

as the input and output ranges are maintained. These components include but are not limited

to linear regulators, switching transistors, pass transistors, and current sense resistors. These

types of devices can be identified using the EVM schematic located in the EVM User’s Guide.

When placing measurement probes near these devices during operation, please be aware

that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Contents

1 General Information 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Description 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Operating Guidelines 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.1 Step 1. Load Connections 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.2 Step 2. Applying Input Power 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.3 Step 3. Evaluating the Demonstration’s Boards Performance. 1-3. . . . . . . . . . . . .

1.3.4 Additional Information 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 DM38500 EVM Performance 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Reference 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 DM38500 EVM Part Descriptions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 DM38500 Board Layouts 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

1−1. DM38500 Evaluation Module Application Schematic 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−2. DM38500 EVM Response, VCC = +15 V 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−3. DM38500 Response, VCC = +15 V 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−4. DM38500 Response, VCC = +15 V 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−1. DM38500 EVM PC Board: Top Assembly 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

General Information

General

Information

This chapter details the Texas Instruments (TI) DM38500 PFC/PWM

Combination Controller 100W Power Factor Correction Preregulator

Evaluation Module (EVM) SLUU068. It includes a list of EVM features, a brief

description of the module illustrated with a pictorial, schematic diagrams, and

EVM specifications.

Topic Page

1.1 Features 1−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Description 1−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Operating Guidelines 1−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 DM38500 EVM Performance 1−5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Features

1-2

1.1 Features

UCC38500 PFC/PWM Combination Controller 100W Power Factor Correc-

tion Preregulator include:

JCombines PFC and 2nd Stage Down Converter Controls

JControls Boost Preregulator to Near-unity Power Factor

JAccurate Power Limiting

JImproved Feedforward Line Regulation

JPeak Current Mode Control in Second Stage

JProgrammable Oscillator

JLeading Edge/Trailing Edge Modulation for Reduced Output Ripple

JLow Startup Supply Current

JSynchronized Second Stage with Programmable Soft-start

JProgrammable Second Stage Shut-down

1.2 Description

The UCC38500 provides all the functions necessary for active power factor

correction and a second stage dc-to-dc converter all in one integrated circuit.

The control IC uses leading edge modulation for the boost stage and trailing

edge modulation for the step down converter to reduce the RMS current in the

boost capacitor. The dc-to-dc controller uses peak current mode control for

easy loop compensation.

The UCC38500 evaluation board is designed to illustrate the performance of

the IC in a complete off-line 100W two-stage power converter using power fac-

tor correction. The demonstration board was designed to operate with a uni-

versal input voltage range (i.e. 85−265 Vac) with a regulated 12V dc output.

Caution

High-voltage levels are present on the evaluation module whenever it is

energized. Proper precautions must be taken when working with the

EVM. The output capacitor has high levels of energy storage and it must

be discharged before the load is removed. Serious injury can occur if

proper safety precautions are not followed.

Description

1-3

General Information

1.3 Operating Guidelines

The operating guidelines for the evaluation board are provided with reference

to the schematic in Figure 1−1 and the component layout in Figure 2−1.

1.3.1 Step 1. Load Connections

A resistive or electronic load can be applied to the output terminals labeled

OUT− and OUT+.

Note: For safety reasons the load should be connected before power is sup-

plied to the demonstration board.

1.3.2 Step 2. Applying Input Power

A 60 Hz AC power source not exceeding 265 VRMS needs be applied across

terminals AC−N and AC−L for proper operation.

1.3.3 Step 3. Evaluating the Demonstration’s Boards Performance.

With the AC source set between 85−265 VRMS the output voltage should be

regulated and the input current should track the input voltage shape with near

unity power factor. The operation of the circuit is verified over the line and load

range and shows efficiency as high as 85%. At lighter loads, there may be

some distortion in the line current due to Discontinuous Conduction Mode

(DCM) operation. Please refer to Figures 1−2, 1−3 and 1−4 for typical EVM

performance.

1.3.4 Additional Information

For more information, pin description and specifications for the UCC38500

PFC/PWM Combination Controller, please refer to the datasheet or contact

the Texas Instruments Semiconductor Product Information Center at

1-800-336-5236 or 1-972-644-5580. Product Information can also be found

on the World Wide Web at www.ti.com.

Description

1-4

Figure 1−1.DM38500 Evaluation Module Application Schematic

UDG−00094

OVP/ENBL

VSENSE

VAOUT

ISENSE

MOUT

CAOUT

IAC

VFF

PKLIMIT

VREF

GT1

GT2

VCC

GND

PWRGND

SS2

VERR

ISENSE2

UCC38500

VREF

R25

VCC

R6 GT1

GT2

D10

C27

PKLIMIT

C28

R17

C19

C22

R28

C25

R23

R34

R21

R22

R33

R20

R15

L1 D3

GT1

R14

R29

PKLIMIT

R19

C26

VREF

R18

R24

C29 C30

ISENSE2

GT2

R13

PWR

GND

GT2

12 V

100 W

−

D11

VAC

85−265VRMS

U4 C7

SGND

PGND2

PGND

PGNDPGND

SGND

PGND

C12

C20

VCC

BIAS

CIRCUIT

VCC

VCCBIAS

CIRCUIT

PGND

C23

PGND2

R26

D14

R36

R16

C14 R35 R32

R27

D13

R31 C8

R30

R10

R12 R11

C21

C16

PGND

C24

R1C4

C18

D15

D12

D16

AC−N

AC−L

OUT +

OUT −

VREF

R3 R39

C13

ISENSE2

C17

H11AV1

SGND

C38

HIGH VOLTAGE −

SEE EVM WARNINGS

AND RESTRICTIONS

HIGH

TEMPERATURE−

SEE EVM WARNINGS

AND RESTRICTIONS

HIGH VOLTAGE −

SEE EVM WARNINGS

AND RESTRICTIONS

HIGH

TEMPERATURE−

SEE EVM WARNINGS

AND RESTRICTIONS

Note: High-Voltage component. See EVM Warnings and Restrictions at the back of this document.

Note: High-Temperature component. See EVM Warnings and Restrictions at the back of this document.

Indice

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