Texas Instruments UCC28056EVM-296 User manual

SLUUBS3A–October 2017–Revised January 2018

UCC28056EVM-296 Evaluation Module

ADVANCE INFORMATION

User's Guide

SLUUBS3A–October 2017–Revised January 2018

UCC28056EVM-296 Evaluation Module

This user’s guide provides basic evaluation instruction from a viewpoint of system operation of a stand-

alone PFC boost power converter.

Contents

1 Introduction ................................................................................................................... 4

2 Description.................................................................................................................... 4

3 Performance Specifications ................................................................................................ 5

4 Test Setup .................................................................................................................... 5

5 Test Points.................................................................................................................... 7

6 Terminals ..................................................................................................................... 7

7 Test Procedure............................................................................................................... 7

8 Performance Data and Typical Characteristic Curves.................................................................. 9

9 Schematic, Assembly Drawing and Bill of Materials................................................................... 18

List of Figures

1 UCC28056EVM-296 Recommended Test Setup........................................................................ 6

2 Efficiency...................................................................................................................... 9

3 Load Regulation vs Output Power ....................................................................................... 10

4 Line Regulation vs Input Voltage......................................................................................... 10

5 Power Factor vs Output Power........................................................................................... 11

6 THD vs Output Power ..................................................................................................... 11

7 85 VAC Startup No Load.................................................................................................. 11

8 85 VAC Startup Full Load................................................................................................. 11

9 115 VAC Startup No Load ................................................................................................ 11

10 115 VAC Startup Full Load ............................................................................................... 11

11 230 VAC Startup No Load ................................................................................................ 11

12 230 VAC Startup Full Load ............................................................................................... 11

13 265 VAC Startup No Load ................................................................................................ 12

14 265 VAC Startup Full Load ............................................................................................... 12

15 Low-Line Voltage and Current............................................................................................ 13

16 High-Line Voltage and Current........................................................................................... 14

17 85 VAC Valley Switching 50-mA Load .................................................................................. 14

18 115 VAC Valley Switching 50-mA Load................................................................................. 15

19 230 VAC Valley Switching 100-mA Load ............................................................................... 15

20 265 VAC Valley Switching 100-mA Load .............................................................................. 16

21 Q1 Max Vds Stress ........................................................................................................ 16

22 D4 Max Voltage Stress.................................................................................................... 17

23 UCC28056EVM-296 Schematic.......................................................................................... 18

24 UCC28056EVM-296 Top Assembly Drawing (Top view)............................................................. 19

25 UCC28056EVM-296 Bottom Layer Assembly Drawing (Top view).................................................. 19

26 UCC28056EVM-296 Top Copper Assembly Drawing (Top view) ................................................... 20

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27 UCC28056EVM-296 Bottom Copper Assembly Drawing (Top view)................................................ 20

List of Tables

1 EVM Performance Specification........................................................................................... 5

2 Test Points.................................................................................................................... 7

3 List of Terminals ............................................................................................................. 7

4 Total Standby Power........................................................................................................ 9

5 Bill of Materials ............................................................................................................. 21

Trademarks

All trademarks are the property of their respective owners.

WARNING

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SLUUBS3A–October 2017–Revised January 2018

UCC28056EVM-296 Evaluation Module

ADVANCE INFORMATION

General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

Always follow TI’s setup and application instructions, including use of all interface components within their

recommended electrical rated voltage and power limits. Always use electrical safety precautions to help

ensure your personal safety and those working around you. Contact TI's Product Information Center

http://support/ti./com for further information.

Save all warnings and instructions for future reference.

Failure to follow warnings and instructions may result in personal injury, property damage, or

death due to electrical shock and burn hazards.

The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed

printed circuit board assembly. It is intended strictly for use in development laboratory environments,

solely for qualified professional users having training, expertise and knowledge of electrical safety

risks in development and application of high voltage electrical circuits. Any other use and/or

application are strictly prohibited by Texas Instruments. If you are not suitable qualified, you should

immediately stop from further use of the HV EVM.

1. Work Area Safety

1. Keep work area clean and orderly.

2. Qualified observer(s) must be present anytime circuits are energized.

3. Effective barriers and signage must be present in the area where the TI HV EVM and its interface

electronics are energized, indicating operation of accessible high voltages may be present, for the

purpose of protecting inadvertent access.

4. All interface circuits, power supplies, evaluation modules, instruments, meters, scopes and other

related apparatus used in a development environment exceeding 50Vrms/75VDC must be

electrically located within a protected Emergency Power Off EPO protected power strip.

5. Use stable and nonconductive work surface.

6. Use adequately insulated clamps and wires to attach measurement probes and instruments. No

freehand testing whenever possible.

2. Electrical Safety

As a precautionary measure, it is always a good engineering practice to assume that the entire EVM

may have fully accessible and active high voltages.

1. De-energize the TI HV EVM and all its inputs, outputs and electrical loads before performing any

electrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safely

de-energized.

2. With the EVM confirmed de-energized, proceed with required electrical circuit configurations,

wiring, measurement equipment connection, and other application needs, while still assuming the

EVM circuit and measuring instruments are electrically live.

3. After EVM readiness is complete, energize the EVM as intended.

WARNING: WHILE THE EVM IS ENERGIZED, NEVER TOUCH THE EVM OR ITS ELECTRICAL

CIRCUITS AS THEY COULD BE AT HIGH VOLTAGES CAPABLE OF CAUSING ELECTRICAL

SHOCK HAZARD.

3. Personal Safety

1. Wear personal protective equipment (for example, latex gloves or safety glasses with side shields)

or protect EVM in an adequate lucent plastic box with interlocks to protect from accidental touch.

Limitation for safe use:

EVMs are not to be used as all or part of a production unit.

Introduction

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1 Introduction

The purpose of the UCC28056EVM-296 (EVM) is to aid in evaluation of the UCC28056 transition mode

boost PFC converter. The EVM is a stand-alone PFC converter designed to operate with 85 to 265 VRMS,

47 to 63 Hz, AC input and up to 165-W DC output from 90 VAC to 265 VAC and 140 W at 85 VAC. The

EVM can be used as it is delivered without additional work, to evaluate a transition mode boost PFC

converter. This user’s guide provides basic evaluation instruction from a viewpoint of system operation of

a stand-alone PFC boost power converter.

2 Description

2.1 Typical Applications

This EVM is used in the following applications:

• AC adapter front end

• Set top box

• Desktop computing

• Gaming

• Electronic lamp ballast

• Digital TV

• Entry-level server and web server

2.2 Features

This EVM has the following features:

• Unified algorithm for working in critical mode (CRM) and discontinuous conduction mode (DCM) with a

high power factor across the entire operating range

• AC input voltage from 85 to 265 VRMS

• AC line frequency from 47 to 63 Hz

• Up to 165-W output power

• High efficiency

• TM, DCM control gives improved light-load efficiency

• Burst mode for reduced standby consumption

• Non-linear gain gives improved transient response

• User-adjustable valley switching

• Robust full-featured protection including overtemperature protection, brown-out protection, output

overvoltage, cycle-by-cycle overcurrent, and gross overcurrent protections

• Test points to facilitate device and topology evaluation

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Performance Specifications

SLUUBS3A–October 2017–Revised January 2018

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3 Performance Specifications

Table 1 displays the EVM performance specifications.

Table 1. EVM Performance Specification

Parameter Test Conditions MIN TYP MAX Units

Input Characteristics

AC Voltage Range 85 265 VRMS

AC Voltage Frequency 47 63 Hz

VCC UVLO On 10.65 VDC

VCC UVLO Off 8.85 VDC

Input DC Current

Input = 85 VAC, Full Load = 165 W 1.85

Arms

Input = 115 VAC, Full Load = 165 W 1.43

Input = 230 VAC, Full Load = 165 W 0.71

Input = 265 VAC, Full Load = 165 W 0.64

Output Characteristics

Output Voltage No Load to Full Load 390 VDC

Output Power 90 to 265 VAC 165 W

Output Power 85 VAC 140 W

Output Voltage Ripple 10 Vpp

System Characteristics

Peak Efficiency 97 %

Operating Temperature Natural Convection 25 °C

4 Test Setup

4.1 Test Equipment

DC Voltage Source: External DC input for VCC. The DC source should be capable of supplying 12 V and

up to 100 mA.

AC Voltage Source: Capable of single-phase output AC voltage 85 to 265 VAC, 47 to 63 Hz, adjustable,

with minimum power rating 200 W and current limit function. The AC voltage source to be used should

meet IEC60950 reinforced insulation requirement.

DC Digital Multimeter: One unit capable of 0 to 450 VDC input range, four-digit display preferred.

Output Load: DC load capable of receiving 380 to 410 VDC, 0.5 A, and 0 to 200 W or greater, with the

capability to display load current, load power, and so forth.

Digital AC Power Meter: Capable of 0 to 300 VAC voltage measurement, 0 to 10 Arms current

measurement. Native power factor measurement and input current THD measurement is preferred.

Oscilloscope: Capable of 500-MHz full bandwidth, digital or analog: if digital, 5 Gsps, or better.

Fan: 200 to 400 LFM forced air cooling is recommended, but not required.

Recommended Wire Gauge: Capable of 10 A, or better than #14 AWG, with the total length of wire less

than 8 feet (4 feet input and 4 feet return).

Test Setup

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4.2 Recommended Test Setup

Figure 1 illustrates the recommended test setup.

Figure 1. UCC28056EVM-296 Recommended Test Setup

WARNING

High voltages that may cause injury exist on this evaluation

module (EVM). Please ensure all safety procedures are followed

when working on this EVM. Never leave a powered EVM

unattended.

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Test Points

SLUUBS3A–October 2017–Revised January 2018

UCC28056EVM-296 Evaluation Module

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5 Test Points

Table 2 lists the EVM test points.

Table 2. Test Points

Test Points Name Description

TP1 Line AC line

TP2 Neutral AC neutral

TP3 Rect AC rectifier output

TP4 COMP Transconductance amplifier output

TP5 DRV Gate-drive output

TP6 GND Ground

TP7 GND Ground

TP8 GND Ground

TP9 VCC VCC sense

TP10 VOSNS Voltage error amplifier inverting input

TP11 BLK Bulk sense

TP12 TP12 Small signal injection terminal

TP13 TP13 Small signal injection terminal

TP14 VEE DC input ground

TP15 RVCC Positive DC input

TP16 VOUT+ Output voltage

TP17 VOUT– Output voltage return

6 Terminals

Table 3 lists the EVM terminals.

Table 3. List of Terminals

Terminal Name Description

J1 AC Input 3-pin, AC power input, 85 V–265 V

J3 I_IND Inductor current sense

J8 RVCC 2-pin, DC power input, 12 V typical

J9 VOUT 4-pin, output voltage terminal, 390 V typical

7 Test Procedure

Use the following steps for the test procedure:

1. Refer to Figure 1 for basic setup. The required equipment for this measurement is listed in Table 2.

2. Before making electrical connections, visually check the board to make sure there are no suspected

spots of damage.

3. Use a loop of wire to short the J3 terminals. Connect a current probe around the wire loop to measure

the inductor current using an oscilloscope.

4. Keep the AC voltage source output off. Connect the AC source to the input of the AC power meter.

Connect the output of the AC power meter to J1 with AC_line to J1-3, AC_earth to J1-1, AC_neutral to

J1-2. Isolate the AC voltage source and meet the IEC60950 requirement. Set the AC output voltage

and frequency within the range specified in Table 1, between 85 and 265 VAC and 47 to 63 Hz. Set

the AC source current limit to 8.5 A.

Test Procedure

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CAUTION

While the EVM does have a fuse installed, failure to set an appropriate current

limit may result in damage to the fuse or other EVM components.

5. Keep the DC voltage source output off. Connect the DC source to J2. Set the DC output voltage to

12 V and the current limit to 100 mA.

6. Connect an electronic load set to either constant-current mode or constant-resistance mode. The load

range is from 0 to 423 mA.

7. If the load does not have a current or a power display, TI recommends inserting a current meter

between the output voltage and the electronic load.

8. Connect a voltage meter to TP16 and TP17 to monitor the output voltage

9. Turn on the AC voltage source output.

10. Turn on the DC source output.

7.1 Equipment Shutdown

Shut down the equipment using the following steps:

1. Shut down the AC voltage source.

2. Shut down the DC voltage source.

3. Shut down the electronic load.

WARNING

High voltage may still be present after turning off the AC and DC

sources. Use the electronic load to discharge the output

capacitance before handling the EVM.

Output Power (W)

Efficiency (%)

0 20 40 60 80 100 120 140 160 180

0.9

0.91

0.92

0.93

0.94

0.95

0.96

0.97

0.98

0.99

d000

85Vac

115Vac

230Vac

265Vac

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Performance Data and Typical Characteristic Curves

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8 Performance Data and Typical Characteristic Curves

8.1 Standby Power

Table 4 lists the total standby power measurement. The electronic load is physically disconnected from J9

for this test. The average input power is measured at VIand external VCC over a 5 minute interval.

Table 4. Total Standby Power

Input Voltage (VRMS) Input Power (mW) VCC Voltage (V) VCC Current (µA) Total Standby Power

(mW)

85 23 12.00743 104.0338 24.249

115 24 12.01006 107.022 25.285

230 39 12.00832 105.630 40.268

265 45 12.00830 105.902 46.272

8.2 Efficiency

Figure 2 illustrates the EVM efficiency graph.

Figure 2. Efficiency

Line Voltage (Vrms)

Output Voltage (V)

80 100 120 140 160 180 200 220 240 260 280

380

382

384

386

388

390

392

394

396

398

400

d000

Iout = 0mA

Iout = 120mA

Iout = 420mA

Output Power (W)

Output Voltage (V)

0 20 40 60 80 100 120 140 160 180

380

382

384

386

388

390

392

394

396

398

400

d000

85Vac

115Vac

230Vac

265Vac

Performance Data and Typical Characteristic Curves

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8.3 Load Regulation

Figure 3 illustrates the load regulation versus output power graph.

Figure 3. Load Regulation vs Output Power

8.4 Line Regulation

Figure 4 illustrates the line regulation versus input voltage graph.

Figure 4. Line Regulation vs Input Voltage

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