Texas Instruments PFCLLCSREVM034 Manuale utente

PFCLLCSREVM034 User Guide

User's Guide

Literature Number: SLUUC46

June 2020

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Table of Contents

Contents

1 Trademarks......................................................................................................................... 7

2 Introduction......................................................................................................................... 7

3 Description.......................................................................................................................... 7

3.1 Typical Applications...................................................................................................... 7

3.2 Features................................................................................................................... 7

4 Performance Specifications................................................................................................... 8

5 Schematic Diagram .............................................................................................................. 9

6 Test Points ........................................................................................................................ 11

7 Terminals .......................................................................................................................... 11

8 Test Setup......................................................................................................................... 12

8.1 Test Equipment ......................................................................................................... 12

8.2 Recommended Test Setup............................................................................................ 12

9 Performance Data and Typical Characteristics Curves............................................................ 13

9.1 Efficiency................................................................................................................. 13

9.2 Standby Power.......................................................................................................... 14

9.3 Power Factor............................................................................................................ 14

9.4 Total Harmonic Distortion.............................................................................................. 15

9.5 Load Regulation ........................................................................................................ 16

9.6 Startup ................................................................................................................... 17

9.7 Output Ripple............................................................................................................ 21

9.8 Load Transient .......................................................................................................... 22

9.9 LLC Loop Response ................................................................................................... 23

9.10 Steady State Waveforms .............................................................................................. 23

9.11 X Capacitor Discharge................................................................................................. 25

10 Assembly Drawings............................................................................................................ 25

11 List of Materials ................................................................................................................. 27

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List of Figures

1 PFCLLCSREVM034 Schematic Diagram: PFC Section................................................................ 9

2 PFCLLCSREVM034 Schematic Diagram: LLC Section............................................................... 10

3 PFCLLCSREVM034 Test Setup Diagram .............................................................................. 12

4 Efficiency vs Output Current.............................................................................................. 13

5 Power Factor vs Output Power........................................................................................... 14

6 THD vs Output Current.................................................................................................... 15

7 Output Voltage vs Output Current ....................................................................................... 16

8 115Vrms Input Startup into No Load (CH1=PFC Output; CH2=AC Input; CH3=LLC Output)................... 17

9 115Vrms Input Startup into No Load Zoomed In (CH1=PFC Output; CH2=AC Input; CH3=LLC Output) ..... 17

10 115Vrms Startup into Full Load (CH1=PFC Output; CH2=AC Input; CH3=LLC Output)......................... 18

11 115Vrms Startup into Full Load Zoomed In (CH1=PFC Output; CH2=AC Input; CH3=LLC Output) ........... 18

12 230Vrms Input Startup into No Load (CH1=PFC Output; CH2=AC Input; CH3=LLC Output)................... 19

13 230Vrms Startup into No Load Zoomed In (CH1=PFC Output; CH2=AC Input; CH3=LLC Output) ............ 19

14 230Vrms Input Startup into Full Load (CH1=PFC Output; CH2=AC Input; CH3=LLC Output) .................. 20

15 230Vrms Startup into Full Load Zoomed In (CH1=PFC Output; CH2=AC Input; CH3=LLC Output) ........... 20

16 No Load Output Ripple (CH3=LLC Output AC Coupled) ............................................................. 21

17 Full Load Output Ripple (CH3=LLC Output AC Coupled) ............................................................ 21

18 No Load to Full Load Transient (CH3=LLC Output AC Coupled; CH4=Output Current) ......................... 22

19 No Load to Full Load Transient Zoomed In (CH3=LLC Output AC Coupled; CH4=Output Current) ........... 22

20 LLC Loop Response....................................................................................................... 23

21 115Vrms Input, Full Load (CH1=PFC Switch Node; CH4=PFC Inductor Current) ................................ 23

22 230Vrms Input, Full Load (CH1=PFC Switch Node; CH4=PFC Inductor Current) ................................ 24

23 10mA Load (CH1=LLC Switch Node; CH4=LLC Resonant Current)................................................ 24

24 X Capacitor Discharge (CH1=Voltage between Line/Neutral)........................................................ 25

25 Top Layer Assembly....................................................................................................... 25

26 Bottom Layer Assembly ................................................................................................... 26

27 Bottom Layer Copper...................................................................................................... 26

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List of Tables

1 PFCLLCSREVM034 Electrical Performance Specifications ........................................................... 8

2 Test Points .................................................................................................................. 11

3 List of Terminals............................................................................................................ 11

4 Efficiency Measurements.................................................................................................. 13

5 Standby Power Measurements........................................................................................... 14

6 List of Materials............................................................................................................. 27

WARNING

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List of Tables

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

Always follow TI's set-up 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://ti.com/customer support for further information.

Save all warnings and instructions for future reference.

WARNING

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:

a. Keep work area clean and orderly.

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

c. 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.

d. 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.

e. Use stable and non-conductive work surface.

f. 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 good engineering practice to assume that the entire EVM

may have fully accessible and active high voltages.

a. 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.

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

wiring, measurement equipment hook-ups and other application needs, while still assuming the

EVM circuit and measuring instruments are electrically live.

c. Once EVM readiness is complete, energize the EVM as intended.

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List of Tables

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

a. Wear personal protective equipment e.g. latex gloves or safety glasses with side shields or protect

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

Limitation for safe use:

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

SLUUC46–June 2020

PFCLLCSREVM034 User Guide

User's Guide

SLUUC46–June 2020

PFCLLCSREVM034 User Guide

1 Trademarks

All trademarks are the property of their respective owners.

2 Introduction

The purpose of the PFCLLCSREVM034 is to aid in evaluation of the UCC256404 LLC resonant controller,

UCC28056B transition mode PFC controller and UCC24624 dual channel synchronous rectification

controller. The EVM features a transition mode boost PFC front end and isolated half bridge LLC

converter with synchronous rectification. The EVM meets efficiency requirements of CoC Tier II and is

built on low cost single layer PCB.

3 Description

3.1 Typical Applications

• Industrial AC-DC adapters

• Power tools

• Medical power supply

• Multi-functional printer

• Enterprise and cinema projector

• PC power supply

• Gaming console power supply

3.2 Features

• Low cost single layer PCB

• AC Input voltage from 90 Vrms to 264Vrms

• Regulated 12-VDC typical output

• Full-load power of 168 W, or full-load current of 14 A

• High efficiency

• Optimized low power features enable extremely low standby power

• Advanced burst mode with burst soft-on and soft-off for minimized audible noise

• X-capacitor discharge

• Test points to facilitate device and topology evaluation

Performance Specifications

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PFCLLCSREVM034 User Guide

4 Performance Specifications

Table 1. PFCLLCSREVM034 Electrical Performance Specifications

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Input Characteristics

AC Voltage Range 90 264 Vrms

AC Voltage

Frequency 47 63 Hz

Output Characteristics

Output Voltage 12 V

Output Current 14 A

System Characteristics

No Load Standby

Power 115-Vrms Input 84.90 mW

No Load Standby

Power 230-Vrms Input 113.59 mW

10% Efficiency 115-Vrms Input 80.96 %

10% Efficiency 230-Vrms Input 80.60 %

4pt Average

Efficiency 115-Vrms Input 90.05 %

4pt Average

Efficiency 230-Vrms Input 90.89 %

Operating

Temperature Natural Convection 25 °C

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Schematic Diagram

SLUUC46–June 2020

PFCLLCSREVM034 User Guide

5 Schematic Diagram

Figure 1. PFCLLCSREVM034 Schematic Diagram: PFC Section

Schematic Diagram

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PFCLLCSREVM034 User Guide

Figure 2. PFCLLCSREVM034 Schematic Diagram: LLC Section

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