Texas instruments UCC28742EVM-001 User Manual

Using the UCC28742EVM-001 10-W Converter

User's Guide

Literature Number: SLUUBU4B

March 2018–Revised June 2018

WARNING

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.

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1 Description

The UCC28742EVM-001 is a 10-W evaluation module for evaluating an off-line power converter applications. The EVM meets CoC tier 2 and DoE Level 6 efficiency and standby power requirements. It is intended for evaluation purposes and is not intended to be an end product. The UCC28742EVM-001 converters 85-V

User's Guide

SLUUBU4B–March 2018–Revised June 2018

Using the UCC28742EVM-001 10-W Converter

RMS

to 265-V

input voltage down to 5-VDC, with a 2.1-A current limit.

RMS

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Figure 1. UCC28742EVM-001

Using the UCC28742EVM-001 10-W Converter

Electrical Performance Specifications

2 Electrical Performance Specifications

Table 1. UCC28742EVM-001 Electrical Performance Specifications

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

INPUT CHARACTERISTICS

LINE

STBY

OUTPUT CHARACTERISTICS

OUT

SYSTEMS CHARACTERISTICS

η 4-point average efficiency η 10% Efficiency 115-V / 230-V RMS input 78

Input voltage (RMS) 85 115/230 265 V Line frequency 47 50/60 63 Hz No load input power VIN= 115 V / 230 V RMS, I

Output voltage VIN= nom, I Output ripple voltage VIN= nom, I Output current VIN= min to max 2 2.05 A Over Current Shut Down VIN= min to max 2.1 A Load step 0 A to 0.5 A 4.1 6 V

25%, 50%, 75% and 100% load, 115-V / 230-V RMS input

Operating temperature range

VIN= min to max, I

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= 0 A 75 mW

OUT

= nom 4.75 5.25 V

OUT

= max, 50 mVpp

OUT

82%

= min to max 25 °C

OUT

Using the UCC28742EVM-001 10-W Converter

SLUUBU4B–March 2018–Revised June 2018

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3 Schematic

Schematic

Figure 2. UCC28742EVM-001 Schematic

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Using the UCC28742EVM-001 10-W Converter

AC Line

AC Neutral

VOUT +

VOUT -

Isolated

Variable AC

Source

1 ohm

Precision Shunt

Current

Measurement

Voltage

Measurement

Power Analyzer

Load

UCC28742EVM-001

TP1

TP2

TP3

TP4

Volt Meter

Oscilloscope

100nF

Scope Probe

Test Setup

4 Test Setup

4.1 Test Setup Requirements

Safety: This evaluation module is not encapsulated and there are voltages that are much greater than 50 VDC.

If you are not trained in the proper safety of handling and testing power electronics please do not test this evaluation module.

Voltage Source: Isolated AC source or variable AC transformer capable of 265 VACcable of handling 10

Voltmeter: Digital voltage meter Power Analyzer: Capable of measuring 1 mW to 10 W of input power and capable of handling 265-V

RMS input voltage. Some power analyzers may require a precision shunt resistor for measuring input current to measure input power of 5 W or less. Please read the power analyzer’s user manual for proper setup.

Oscilloscope:

• 4 Channel 100 MHz.

• Probes capable of handling 600 V.

Output Load: Resistive or electronic load capable handling 15 W at 5 V. Recommended Wire Gauge: Insulated 22 AWG.

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WARNING

4.2 Test Setup Diagram

Figure 3. UCC28742EVM-001 Test Setup Diagram

Using the UCC28742EVM-001 10-W Converter

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Output Power

Efficiency (%)

10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

60%

65%

70%

75%

80%

85%

D001D001

115 V RMS 230 V RMS

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5 Test Points

Table 2. Test Point Functions

TEST POINTS NAME DESCRIPTION

TP1 L AC line voltage input TP2 N AC neutral input TP3 VOUT + Output supply TP4 VOUT – Output return

6 Performance Data and Typical Characteristic Curves

6.1 Efficiency

Table 3. Efficiency Test Data

Test Points

VINRMS V

115 V 5.018 V 0.000 A 0.055 W N/A 115 V 5.017 V 0.201 A 1.268 W 79.5% 115 V 5.015 V 0.501 A 3.072 W 81.8% 115 V 5.014 V 1.002 A 6.124 W 82.0% 115 V 5.013 V 1.500 A 9.183 W 81.9% 115 V 5.011 V 2.004 A 12.244 W 82.0% 230 V 5.019 V 0.000 A 0.072 W N/A 230 V 5.017 V 0.201 A 1.317 W 76.6% 230 V 5.015 V 0.501 A 3.086 W 81.4% 230 V 5.015 V 1.002 A 6.097 W 82.4% 230 V 5.013 V 1.500 A 9.121 W 82.5% 230 V 5.011 V 2.004 A 12.157 W 82.6%

OUT

EFFICIENCY

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Figure 4. Efficiency

Using the UCC28742EVM-001 10-W Converter

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