Texas Instruments UCC28056EVM-296 User manual

1
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
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

www.ti.com
2SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
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
www.ti.com
3
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
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 www.ti.com
4SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
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

www.ti.com Performance Specifications
5
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
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 www.ti.com
6SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
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.

www.ti.com Test Points
7
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
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 www.ti.com
8SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
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
1
d000
85Vac
115Vac
230Vac
265Vac
www.ti.com Performance Data and Typical Characteristic Curves
9
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
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 www.ti.com
10 SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
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

Output Power (W)
THD (%)
40 60 80 100 120 140 160 180
8%
10%
12%
14%
16%
18%
20%
d000
85Vac
115Vac
230Vac
265Vac
Output Power (W)
Power Factor (%)
0 20 40 60 80 100 120 140 160 180
0.4
0.45
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
1
d000
85Vac
115Vac
230Vac
265Vac
www.ti.com Performance Data and Typical Characteristic Curves
11
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
8.5 Power Factor
Figure 5 illustrates the power factor versus output power graph.
Figure 5. Power Factor vs Output Power
8.6 THD
Figure 6 illustrates the THD versus output power graph.
Figure 6. THD vs Output Power
8.7 Startup
The following waveforms show the output voltage behavior when the line voltage has already been
applied and the instant the VCC voltage exceeds the startup threshold. From Figure 7 to Figure 14,
Channel 1 = VCC, Channel 2 = Input Voltage and Channel 3 = Output Voltage

Performance Data and Typical Characteristic Curves www.ti.com
12 SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
Figure 7. 85 VAC Startup No Load Figure 8. 85 VAC Startup Full Load
Figure 9. 115 VAC Startup No Load Figure 10. 115 VAC Startup Full Load
Figure 11. 230 VAC Startup No Load Figure 12. 230 VAC Startup Full Load

www.ti.com Performance Data and Typical Characteristic Curves
13
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
Figure 13. 265 VAC Startup No Load Figure 14. 265 VAC Startup Full Load
8.8 Line Voltage and Line Current
Figure 15 and Figure 16 illustrate the low- and high-line voltage and current waveforms.
Figure 15. Low-Line Voltage and Current

Performance Data and Typical Characteristic Curves www.ti.com
14 SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
Figure 16. High-Line Voltage and Current
8.9 Valley Switching
The following waveforms shows drain to source voltage of the MOSFET and the valley switching action on
the EVM.
Figure 17. 85 VAC Valley Switching 50-mA Load

www.ti.com Performance Data and Typical Characteristic Curves
15
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
Figure 18. 115 VAC Valley Switching 50-mA Load
Figure 19. 230 VAC Valley Switching 100-mA Load

Performance Data and Typical Characteristic Curves www.ti.com
16 SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
Figure 20. 265 VAC Valley Switching 100-mA Load
8.10 Voltage Stress Q1
Figure 21 illustrates the voltage stress Q1 waveform.
Figure 21. Q1 Max Vds Stress

www.ti.com Performance Data and Typical Characteristic Curves
17
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
8.11 Voltage Stress D4
Figure 22 illustrates the voltage stress D4 waveform.
Figure 22. D4 Max Voltage Stress

600V
~3
+1
~
2
-
4
D1
VOSNS
Line
Neutral
GATE
30V
D3
DRAIN
453k
R11
0.13
R9
0.13
R10
VCC
RV1
600V
D4
100V
D5
3.24M
R15
3.24M
R16
3.24M
R17
2 11
NC
4
NC
6NC 8
240
µH
750317130
L3
68µF
C17
68µF
C16
6 7
1 12
20mH
L2
744825320
1000pF
C5
1000pF
C4
0.47µF
C6
220µH
L1
3.24M
R5
3.24M
R6
3.24M
R7
10.0
R22
10µF
C15
10pF
C13
0.22µF
C3
F1
37215000001
2200pF
C14
J3
J2
J5
J4
J7
TP3
TP16
TP17
TP6
OUTPUT: 390 VDC NOMINAL, 0.423 A MAX
1
2
J8
2
1
3
Q1
STF28N60DM2
51
R14
TP15
TP12
TP13
1
2
3
J1
TP5
TP10
TP4
DRV
GND
ZCD
COMP
1
2
3
4
J9
0.47µF
C12
10
R3
1.0
R2
TP1
TP2
PE
TP14
SOURCE
NOTES:
LINE INPUT VOLTAGE: 85VRMS - 265VRMS,
47Hz - 63Hz
OUTPUT VOLTAGE: 390VDC nominal
MAXIMUM OUTPUT POWER: 165W
VOUT+
DRV
5
COMP
6
GND
4
VOSNS 1
ZCD/CS 2
VCC 3
U1
UCC28056DBV
3.0k
R12
36.5k
R18 120k R19
75k
R20 390k R21
TP11
TP7 TP8
3300pF
C10
0
R13
0.033µF
C7
1µF
C8
180k
R1
J6
TP9
10pF
C9
82.5k
R4
24.3k
R8
600V
D2
RTN VOUT-
VEE
GND
0.47µF
C18
0.33µF
C1
0.33µF
C2
470pF
C11
4.70 ohm
t°
RT1
Copyright © 2018, Texas Instruments Incorporated
Schematic, Assembly Drawing and Bill of Materials www.ti.com
18 SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
9 Schematic, Assembly Drawing and Bill of Materials
9.1 Schematic
Figure 23 illustrates the EVM schematic.
Figure 23. UCC28056EVM-296 Schematic

www.ti.com Schematic, Assembly Drawing and Bill of Materials
19
SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
9.2 Assembly Drawing
Figure 24 through Figure 27 illustrate the EVM assembly drawings.
Figure 24. UCC28056EVM-296 Top Assembly Drawing (Top view)
Figure 25. UCC28056EVM-296 Bottom Layer Assembly Drawing (Top view)

Schematic, Assembly Drawing and Bill of Materials www.ti.com
20 SLUUBS3A–October 2017–Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
UCC28056EVM-296 Evaluation Module
ADVANCE INFORMATION
Figure 26. UCC28056EVM-296 Top Copper Assembly Drawing (Top view)
Figure 27. UCC28056EVM-296 Bottom Copper Assembly Drawing (Top view)