Texas Instruments UCC3817-EVM Manuale utente

User’s Guide

UCC3817 BiCMOS Power Factor

Preregulator Evaluation Board

User’s Guide

SLUU077C –September 2000 –Revised November 2002

2UCC3817 BiCMOS Power Factor Preregulator

UCC3817 BiCMOS Power Factor Preregulator

Evaluation Board

Mike O’Loughlin Power Supply Control Products

Contents

1 Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Features 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Description 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Operating Guidelines 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Step 1: Load Connections 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Step 2: Applying Input Power 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Step 3: Measuring the Evaluation Board’s Performance 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Evaluation Board Layouts 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Evaluation Board Components 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Typical Performance 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Additional Information 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SLUU077C –September 2000 –Revised November 2002

UCC3817 BiCMOS Power Factor Preregulator

1 Introduction

This user’s guide details the Texas Instruments (TI) UCC3817–EVM BiCMOS Power Factor Preregulator

Evaluation Module (EVM) SLUU077. It includes a list of EVM features, a brief description of the module

illustrated with pictorial and schematic diagrams and EVM specifications.

The UCC3817 evaluation board is designed to illustrate the performance of the controller in a 250 W boost

converter with power factor correction. The board is designed to handle a universal input operating voltage

range (i.e. 85–265 V ac) with a regulated 385 V dc output.

CAUTION:

Proper precautions must be taken

when working with the board

DHigh voltage levels are present on the evaluation board whenever it is energized.

DThe output capacitor has high levels of energy storage and it must be discharged before the load is removed.

Improper handling of the evaluation board could cause serious injury.

DIt is important to maintain the ambient temperature around the evaluation board to below 40°C during

operation

1.1 Evaluation Module Features

DDesigned for Compliance with IEC 1000-3-2 (Low Total Harmonic Distortion)

DWorldwide Line Operation 85 VRMS to 265 VRMS

DRegulated 385-V, 250-W(max), dc Output

DAccurate Power Limiting

DAccurate Overvoltage Protection

1.2 Description

The UCCx817 provides all the functions necessary for active power-factor-corrected preregulators. The

controller achieves near-unity power factor by shaping the ac input-line current waveform to correspond to that

of the ac input-line voltage. Average current-mode control maintains stable, low-distortion, sinusoidal line

current.

The controller’s operation is similar to previously designed Unitrode preregulators with an added feature to

reduce the RMS-current in the boost capacitor. The controller uses leading-edge modulation that, when

synchronized properly with a downstream dc-to-dc converter, reduces the RMS current in the boost capacitor.

SLUU077C –September 2000 –Revised November 2002

4UCC3817 BiCMOS Power Factor Preregulator

UDG-01001

16GND DRVOUT

R17

20 Ω

1µF CER

VCC

100µF AI EI

14 C1 560 pF

13 C4 0.01µF

12 R1 12

kΩ

R3 20

kΩ

499

kΩR4

249

kΩ

R5 10

kΩ

C5 1µF

VCC

VSENSE

OVP/EN

VREF

VAOUT

VFF

C6 2.2µF

C7 150 nF

100

kΩ

4.02

kΩ

C8 270 pF

R8 12

kΩ

(OPTIONAL)

R10

4.02

kΩ

(OPTIONAL)

R11

kΩ

R12

kΩ

R14

0.25Ω5

C13

0.47µF

600 V

C14

1.5 µF

400 V

R13

383

kΩ

IAC

R15

kΩ

R16

100 Ω

VCC

C10

1µFC11

1µF

D7 D8

1 mH D2

8 A, 600 V

6 A, 600 V

C12

220µF

450 V

VOUT

385VDC

PKLIMIT

CAOUT

CAI

MOUT

IAC

UCC3817

VLINE

85–265

VRMS

VREF

C9 1.2 nF

R6 30

kΩ

6 A

600 V

R21

383

kΩ

R19

499

kΩ

R20

274

kΩ

C15

3.3µF

GND

AC2

AC1

VREF

IAC

VOVO

HIGH VOLTAGE–

SEE EVM WARNINGS

AND RESTRICTIONS

HIGH TEMPERATURE–

SEE EVM WARNINGS

AND RESTRICTIONS

HIGH VOLTAGE–

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.

Figure 1. Evaluation Board Schematic

2 Operating Guidelines

The operating guidelines for the evaluation board are provided with reference to the schematic in Figure 1.

NOTE: In order for the output voltage to regulate, a load of 10 W must be applied to the evaluation

board’s output. In order to maintain power factor near unity, the voltage loop is designed with a slow

frequency response. Large transient steps in output current can cause the evaluation module to go

out of regulation.

SLUU077C –September 2000 –Revised November 2002

UCC3817 BiCMOS Power Factor Preregulator

2.1 Step 1. Load Connections

A resistive or electronic load should be applied to the output connections of VOand GND.

NOTE: For safety reasons the load should be connected before power is supplied to the evaluation

board.

2.2 Step 2. Applying Input Power

A 50- or 60-Hz ac power source not exceeding 265 VRMS needs be applied across terminals AC1 and AC2 for

proper operation.

2.3 Step 3. Measuring the Evaluation Board’s Performance

With the ac source set between 85 VRMS and 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 in the 90–95% range. At lighter loads, there may be some

distortion in the line current due to DCM operation. Please refer to Figure 3 and Figure 4 for typical evaluation

board performance.

3 Evaluation Board Layouts

R16 R10

R11

C10

C11

R21

R13

R19

R20

SYNC

VCC

R22

C14

C15

D5 D6

R12

FA1

UCC3817 EVALUATION BOARD

AC1

XC12

AC2 C13

D8 L1

XL1

D7 R18

R15

HS1

GND

C12

GND

R17

R14

HIGH TEMPERATURE

SEE EVM WARNINGS

AND RESTRICTIONS

HIGH VOLTAGE

SEE EVM WARNINGS

AND RESTRICTIONS

HIGH VOLTAGE

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.

Figure 2. UCC3817 Evaluation Board Layout Assembly

SLUU077C –September 2000 –Revised November 2002

6UCC3817 BiCMOS Power Factor Preregulator

4 Evaluation Board Components

. Bill of Materials

Reference Qty DESCRIPTION Manufacturer Part Number

C1 1 560 pF, 50 V, ceramic Panasonic ECU–S1H561JCA

C2 1 100 µF, 25 V, electronic Panasonic EEU–FC1V101S

C3, C5 21 µF, 50 V, ceramic Panasonic ECU–S1H105MEB

C4 1 0.01 µF, 50 V, ceramic Panasonic ECU–S1H103KBA

C6, C15 22.2 µF, 50 V, ceramic Panasonic ECU–S1H225MEB

C7 1 150 nF, 50 V, ceramic, ±10% Panasonic ECU–S1H154KBB

Capacitors C8 1270 pF, 50 V, ceramic, ±10% Panasonic ECU–S1H271JCA

Ca acitors

C9 1 1.2 nF, 50 V, ceramic, ±10% Panasonic ECU–S1H122JCB

C10, C11 21 µF, 50 V, stacked metal poly Panasonic ECQ–V1H105JL

C12 1 220 µF, 450 V electronic Panasonic ECO–S2WB221DA

C13 1 0.47 µF, 600 V (optional for user, not used on EVM) Panasonic ECQ–E6474KF

C14 1 1.5 µF, 400 V Poly Panasonic ECW–F4155JB

C16 1 Not used Panasonic ECU–S2A330JCA

D1 1 6 A, 600 V, ultra fast diode International Rectifier HFA08TB60

D2 1 8 A, 600 V, 400 A surge General Instruments GI756CT

D3 1 6 A, 600 V, bridge General Instruments PB66

Diodes D4, D5,

D7, D8 41 A, 40 V, schottky 1N5819

D6 1 100 mA, 20 V, schottky BAT85

D9 1 Not used

F ses

F1 1 6 A, 250 V, 3 AG glass fast acting cartridge type

Fuses FH1, FH2 23AG fuse clip

Heat Sink

HS1 1 Heat sink for Q1 Aavid 513201

Heat Sink HS2 1Heat sink for D1 Aavid 579302 B 0 00 00

Inductors L1 1 1 mH, 5.5 A, 20:1 TR Cooper Electronic

Technologies CTX08–13679–02

MOSFETs Q1 1 International Rectifier IRFP450

R1 1 12.1 kΩ, 1/4 W

R3 1 20 kΩ

R4 1 249 kΩ

R5, R11 210 kΩ

R6 1 30.1 kΩ

R7 1 100 kΩ

Resistors R8 112.1 kΩ

Resistors

R9, R10 24.02 kΩ

R12 1 2 kΩ

R13, R21 2383 kΩ

R14 1 0.25 Ω, 3 W

R15, R18 224 kΩ, 1W, metal oxide/metal film Panasonic ERG 1S G 243

R16 1 100 Ω

SLUU077C –September 2000 –Revised November 2002

UCC3817 BiCMOS Power Factor Preregulator

Reference Qty DESCRIPTION Manufacturer Part Number

R17 1 20 Ω

R18 1 24 kΩ, 1W, metal oxide/metal film ERX 1S G 243

Resistors R2, R19 2499 kΩ

Resistors

R20 1 274k

R22 1 Zero Ohm jumper or 26AWG wire

Integrated

Curcuit U1 1 UCC3817N Texas Instruments UCC3817N

Sockets X @ U1 116 pin DIP socket

Board PCB 1 UCC3817 BARE PC BOARD

X1 @ Q1 1Thermal Pad Silicone TO220

Hardware X2 @ HS1 1Screw Pan Hd #6–32 X 3/8

Hardware

X3 @ HS1 1Nut #6X32

NOTE: Unless otherwise specified, all resistors are 0.25 W metal film with a 1% tolerance.

5 Typical Performance

75 25 50 75 100 125 150 175 200 225 250

100

Efficiency (%)

POUT –Output Power –W

VIN = 85 V

VIN = 265 V

VIN = 175 V

EFFICIENCY vs. OUTPUT POWER

Figure 3.

SLUU077C –September 2000 –Revised November 2002

8UCC3817 BiCMOS Power Factor Preregulator

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

25 50 75 100 125 150 175 200 225 250

Power Factor

POUT –Output Power –W

VIN = 265 V

VIN = 175 V

VIN = 85 V

POWER FACTOR

vs.

OUTPUT POWER

Figure 4.

6 Additional Information

For more information, pin description and specifications for the UCC3817 PFC Controller, please refer to the

UCC3817 datasheet, TI Literature Number SLUS395, 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 at

http://www.ti.com.

This evaluation module can also be used to evaluate the performance of the UCC3818 PFC control IC by

removing R16 and applying the bias voltage to the VCC pin through a separate bias supply.

SLUU077C –September 2000 –Revised November 2002

UCC3817 BiCMOS Power Factor Preregulator

DYNAMIC WARNINGS AND RESTRICTIONS

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

385 V +/–10%.

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

IMPORTANT NOTICE

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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

ordersandshouldverifythatsuchinformationiscurrentandcomplete.AllproductsaresoldsubjecttoTI’sterms

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.

TIdoesnotwarrantorrepresentthatanylicense, eitherexpress orimplied, isgrantedunderanyTIpatent right,

inwhichTIproductsorservicesareused.InformationpublishedbyTIregardingthird–partyproductsorservices

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

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

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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

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