Texas Instruments UCC28810EVM-002 User manual

Using the UCC28810EVM-002
User's Guide
Literature Number: SLUU355AMarch 2009 – Revised June 2009

1 Introduction
2 Description
2.1 Typical Applications
2.2 Features
User's GuideSLUU355A – March 2009 – Revised June 2009
A 0.9-A Constant Current Supply with PFC for 100-W LEDLighting Applications
The UCC28810EVM-002 is a constant current non-isolated power supply for LED lighting applications. Itwill convert universal mains (90 VRMS to 264 VRMS) to a 0.9-A constant current into a 100-W load. Thisevaluation module will allow the customer evaluate the UCC28810/11 in a typical LED lighting application.
The evaluation module uses a two stage approach to controlling the output current.
The first stage is a transition mode PFC circuit. This ensures the design meets the harmonic current orpower factor requirements set out by various standards, such as EN61000-3-2. The PFC circuit convertsthe AC input to a regulated DC voltage. This DC voltage can be configured in one of two ways. Thedefault configuration of the module is that of a boost follower type PFC. The boost follower PFC is wherethe PFC regulated output DC voltage tracks the AC input peak voltage. The second configuration requiresremoving some components and changing a resistor value see below for more details. This secondconfiguration removes the tracking element of the PFC circuit. The PFC DC output voltage will then beregulated to a fixed value in the region of 396 VDC.
The second stage also uses transition mode but is configured as a buck converter. It converts the PFCoutput voltage to a fixed constant current. This circuit is capable of supplying 0.9 A into a 100-W load. Italso accepts PWM dimming inputs. Alternatively the user can use the PWM circuit on the module to seethe dimming function.
This module will work with most high brightness LED’s (HB-LED) that operate with 0.9 A and a total stringvoltage drop of between 55 V and 110 V.
•AC Input General Lighting Applications Using HB-LED’s•Industrial, Commercial and Residential Lighting Fixtures•Outdoor Lighting: Street, Roadway, Parking, Construction and Ornamental LED Lighting Fixtures
•90 VRMS to 264 VRMS operation•Boost Follower or Fixed Output PFC Stage•PFC Disable•Output Current Disable•External or Internal PWM Dimming
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications2 SLUU355A – March 2009 – Revised June 2009Submit Documentation Feedback

3 Electrical Performance Specifications
www.ti.com Electrical Performance Specifications
Table 1. UCC28810EVM-002 Electrical Performance Specifications
SYMBOL PARAMETER CONDITIONS MIN NOM MAX UNITS
INPUT CHARACTERSTICS
V
IN
Input voltage 90 264 V
RMS
I
IN
Input current 0.175 1.1 A
RMS
PF Power factor P
OUT
= 80 W to 100 W 0.95 0.97
OUTPUT CHARACTERSTICS
PFC Stage
V
OUT
PFC output voltage 235 415 VDC
LED Driver Stage
P
OUT
Output power 45 80 100 WI
OUT
Output current 0.84 0.9 0.96
ALine regulation 0.03Frequency 60 128 kHz
SYSTEMS CHARACTERSTICS
ηFull load efficiency 90% 93%
PWM Dimming
(1)
Threshold 0.72 1.3 VFrequency range 200 1000 HzDuty cycle 0% 90%
(1)
The PWM dimming signal is inverted, 0% duty cycle is 100% LED current.
SLUU355A – March 2009 – Revised June 2009 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications 3Submit Documentation Feedback

4 Schematic
++
+
Schematic www.ti.com
Figure 1. UCC28810EVM-002 PFC Stage Schematic
4A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications SLUU355A – March 2009 – Revised June 2009Submit Documentation Feedback

VSENSE
EAOUT
VINS ISENSE TZE
GND
GDRV
VDD
www.ti.com Schematic
Figure 2. UCC28810EVM-002 Buck Stage Schematic
SLUU355A – March 2009 – Revised June 2009 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications 5Submit Documentation Feedback

5 Test Setup
5.1 Test Equipment
5.1.1 Voltage Source:
5.1.2 Multimeters
5.1.3 Output Load
5.1.4 Oscilloscope
5.1.5 Signal Generator
5.1.6 Fan
5.1.7 Recommended Wire Gauge
Test Setup www.ti.com
WARNINGHigh voltages, that may cause injury, exist on this evaluationmodule (EVM). Please ensure all safety procedures are followedwhen working on this EVM. Never leave a powered EVMunattended. The use of isolated test equipment is highlyrecommended.
See Figure 3 for recommended test set up.
•Source 1: Isolated AC voltage source or VARIAC, capable of 90 VRMS to 264 VRMS at 150 W.•Source 2: A 3.3-V DC source capable of 100 mA.
Three digital multimeters are recommend, one for current measurement, A1, and two for voltagemeasurements, V1 and V2.
It is recommended that actual high brightness LED’s (HB-LED’s) are used for the load. They should berated at 0.9 A. The HB-LED’s should be connected in series. Their voltage drop should be between 55VDC and 110 VDC. Alternatively a constant voltage electronic load could be used. If using a constantvoltage electronic load a 1000- µF/250 VDC capacitor is required at the input to the electronic load. The1000 µF capacitor should not be used if using HB-LED’s as the load.
A digital or analog oscilloscope with current probe is required to view the AC current in the PFC inductoror buck inductor.
A signal generator that can produce a square wave pulse train at between 200 Hz and 1 kHz is requiredto do external PWM dimming.
Forced air cooling is not required
A minimum of 18 AWG wire is recommended. Also the wire connections between the AC source and theEVM, and the EVM and load should be less than two feet long. The AC input connector accepts astandard IEC320-C13 connector with ground pin.
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications6 SLUU355A – March 2009 – Revised June 2009Submit Documentation Feedback

5.2 Recommended Test Setup
TP3
Buck bias voltage monitor
TP4 & TP5
PFC output voltage
TP1 & TP2
Loop injection point
CL2
Current Probe:
Buck inductor
ripple current
monitor
J3
Short pins to Enable
On Board Dimming
+
L N
V2
CL1
Current Probe:
PFC inductor
ripple current
monitor
1000uF
250V
A1
V1
J4
Pin 1: Buck Shutdown
Pin 2: GND
Pin 3 External PWM dimming input
J2
Pin 1: PFC Shutdown
Pin 2: GND
IEC320
-C13
Plug
90 - 265
VRMS
AC Source
Constant
Voltage
Load
+ -
5.3 List of Test Points
www.ti.com Test Setup
Figure 3. UCC28810EVM-002 Recommended Test Set Up
Note: The 1000- µF/250-V capacitor on the output is not required if the load is a string of HB-LED’s.
Table 2. Test Point Functions
TEST POINTS NAME DESCRIPTION
TP1 Loop injection pointTP2 Loop injection point, PFC outputTP3 VCC_BK Buck bias voltage outputTP4 PFC+ PFC output voltageTP5 PFC- PFC output voltage groundTP6 VCC_BK Buck bias voltage inputTP7 GND Buck bias voltage groundTP8 GND Ground connectionTP9 EN Buck enableTP10 GND Buck input voltage groundTP11 BK_IN Buck input voltageJ2-1 PFC shutdown Apply 3.3 V to this pin to shutdown PFC stageJ2-2 GNDJ4-1 BK_Shutdown Apply 3.3 V to this pin to shutdown buck stageJ4-2 GNDJ4-3 PWM Dim Input for external PWM dimmingShort the two pins on J3 to enable on board PWM diming. R26J3 On board dim
varies dimming duty cycle
SLUU355A – March 2009 – Revised June 2009 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications 7Submit Documentation Feedback

6 Test Procedure
6.1 Applying Power to the EVM
6.2 Line/Load Regulation and Efficiency Measurement Procedure
6.3 PFC Disable
Test Procedure www.ti.com
All tests will use the set up described in Section 5 of this user guide. Ensure potentiometer R26 is rotatedcompletely clockwise.
WARNINGHIGH VOLTAGE levels are present on this evaluation modulewhenever it is energized. Proper precautions must be observedwhenever working with this module. There is an energy storagecapacitor (C17) on this module which must be discharged beforethe board can be handled. Serious injury can occur if proper safetyprocedures are not followed.
1. Set up the EVM as described in Section 5 of this user guide.2. Ensure the AC source is off.3. Ensure potentiometer R26 is rotated completely clockwise.4. Set constant voltage load to between 55 V and 110 V. If using a HB-LED string ensure the voltagedrop, when operating, is between 55 V to 110 V nominal. Note the 1000- µF/250 V capacitor is notrequired on the output if using a HB-LED string.5. Set AC source to 90 VRMS.6. Turn on AC source.7. Monitor PFC output voltage at TP4 and TP5, V2.8. Monitor output current at A1.9. Monitor output voltage at V1.10. The EVM is now ready for testing.
1. Apply power to the EVM per Section 6.1 .2. Vary the constant voltage load from 110 V to 55 V.3. Observe output current on A1 stays constant.4. Vary AC source from 90 VRMS to 264 VRMS.5. Observe output current on A1 stays constant.6. PFC inductor ripple current can be measured at CL1 using an oscilloscope and current probe.7. The buck output inductor current can be measured at CL2 using an oscilloscope and current probe.8. See Section 7 for some typical test results.
1. Ensure the AC source is off.2. Connect a DC source to J2.3. Set DC source to 0 V.4. Apply power to the EVM per Section 6.1 .5. Increase DC source to 3.3 V. This input can accept up to 12 V.6. Observe PFC output voltage reduces, V2.7. PFC inductor ripple current looses high frequency component.
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications8 SLUU355A – March 2009 – Revised June 2009Submit Documentation Feedback

6.4 Buck Disable
6.5 Internal Dimming Function
6.6 External Dimming Function
6.7 Configuring the PFC Stage for Fixed Output
6.8 Equipment Shutdown
www.ti.com Test Procedure
1. Ensure the AC source is off.2. Connect a DC source to J4, pins 1 and 2.3. Set DC source to 0 V.4. Apply power to the EVM per Section 6.1 .5. Increase DC source to 3.3 V. This input can accept up to 12 V.6. Observe output current, A1, drops to zero.7. PFC voltage, V2, does not change.
1. Ensure the AC source is off.2. Ensure jumper is present on J3.3. Apply power to the EVM per Section 6.1 .4. Rotate R26 potentiometer slowly anti clockwise.5. Observe output current on A1 reduce from nominal 0.9 A to 0.1 A. If LED string is attached observeLED’s dim.
1. Ensure the AC source is off.2. Ensure jumper is removed from J3.3. Connect signal generator to J4, pins 3 and 2.4. Set signal generator to generator a pulse from 0 V to 3.3 V at 200 Hz with variable duty cycle. Notewhen the PWM signal is high the LED light is reduced. 100% duty cycle will turn LED off.5. Apply power to the EVM per Section 6.1 .6. Vary the duty cycle of the signal generator output.7. Observe output current, A1, changes. If an LED string is attached observe LED’s dim.
The EVM ships configured as a boost follower PFC. Using a soldering iron some simple componentmodifications can change the PFC configuration from boost follower to fixed output voltage.1. Remove R1, R3, R4, R6, C1 and Q1.2. Change R11 to 6.49 k Ω.3. The EVM now uses a fixed output voltage PFC stage. Repeat tests to see functionality.
1. If DC sources are connected to shutdown pins, J2 and J4, ensure they are set to 0 V.2. Ensure load is at maximum, this will help discharge C17.3. Turn off AC source.4. Monitor PFC output voltage V2. Do not handle EVM until V2 reads less than 50 VDC.
SLUU355A – March 2009 – Revised June 2009 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications 9Submit Documentation Feedback

7 Performance Data and Typical Characteristic Curves
80 100 120 140 200 220 260
VRMS - Line Voltage - V
0.88
0.98
1.00
160 180 240
0.92
0.94
PF - Power Factor and Efficiency - %
EFFICIENCY/POWER FACTOR
vs
LINE VOLTAGE
Efficiency
Power Factor
0.90
0.96
0
2
4
10
12
6
8
THD - Total Harmonic Distortion - %
80 100 120 140 200 220 260
VRMS - Line Voltage - V
160 180 240
TOTAL HARMONIC DISTORTION
vs
LINE VOLTAGE
7.1 Transient
Ch2:
Buck VDS
Ch4:
LED Voltage
0.5 A/div.
Ch3:
LED Current
Ch1:
Buck VIN
TRANSITION MODE BUCK PWM RESPONSE
(Ch1 and Ch 4 share GND reference)
Ch2:
Buck VDS
Ch4:
LED Voltage
0.5 A/div.
Ch3: LED
Current
Ch1:
Buck VIN
TRANSITION MODE BUCK PWM RESPONSE EXPANDED
(Ch1 and Ch4 share GND reference)
Performance Data and Typical Characteristic Curves www.ti.com
Figure 4 through Figure 8 present some typical performance curves for the UCC28810EVM-002 with 30Cree XRE LED’s at 900 mA.
Figure 4. Figure 5.
Figure 6. Figure 7.
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications10 SLUU355A – March 2009 – Revised June 2009Submit Documentation Feedback

7.2 Input Current
Ch2:
Buck VDS
Ch4:
LED VOUT
Ch3:
AC Input
Current
Ch1:
Buck VIN
TRANSITION MODE BUCK PWM AND LINE INPUT CURRENT
(Ch1 and Ch4 share GND reference)
www.ti.com Performance Data and Typical Characteristic Curves
Figure 8.
SLUU355A – March 2009 – Revised June 2009 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications 11Submit Documentation Feedback

8 EVM Assembly Drawing and PCB layout
EVM Assembly Drawing and PCB layout www.ti.com
Figure 9 through Figure 11 show the design of the UCC28810EVM-002 printed circuit board.
Figure 9. UCC28810EVM-002 Top Layer Assembly Drawing (top view)
Figure 10. UCC28810EVM-002 Top Copper (top view)
Figure 11. UCC28810EVM-002 Bottom Layer (viewed through top layer)
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications12 SLUU355A – March 2009 – Revised June 2009Submit Documentation Feedback

9 List of Materials
www.ti.com List of Materials
The EVM components list according to the schematic shown in Figure 1 and Figure 2 .
Table 3. List of Materials
QTY REF DES DESCRIPTION MFR PART NUMBER
1 C1 Capacitor, ceramic, 10 µF, 25 V, X5R, 20%, 1206 Std StdC2, C5 Capacitor, metallized polyester film, 0.1 µF, 275 VAC,2 Std Std10%, X2, 17.5 mm x 5.5 mm2 C3, C4 Capacitor, ceramic disc, 1 nF, 250 V, Y1/X1 Panasonic ECK-ANA102MB1 C6 Capacitor, ceramic, 2.2 µF, 25 V, X7R, 10%, 0805 Std StdC7, C9, Capacitor, ceramic, 1 nF, 50 V, NPO, 5%, 08056 C10, C21, Std StdC23, C251 C8 Capacitor, ceramic, 330 nF, 16 V, X7R, 10%, 0805 Std Std1 C11 Capacitor, ceramic, 18 pF, 50 V, NPO, 5%, 1206 Std StdC12, C28, Capacitor, ceramic, 1 µF, 25 V, X5R, 10%, 08053 Std StdC34
C13, C20, Capacitor, ceramic, 0.1 µF, 25 V, X7R, 10%, 08053 Std StdC291 C14 Capacitor, polypropylene film, 0.56 µF, 400 V, 5% Panasonic ECW-F4564JLC15, C16 Capacitor, aluminum electrolytic, 100 µF, 35 V, 20%, 6.32 Std Stdmm x 11.5 mm1 C17 Capacitor, aluminum electrolytic, 82 µF, 450 V, TS-HB Panasonic ECO-S2WB820BA1 C18 Capacitor, ceramic, 10 µF, 25 V, X7R, 10%, 1210 Std Std2 C19, C22 Capacitor, ceramic, 10 nF, 50 V, X7R, 10%, 0805 Std Std1 C24 Capacitor, ceramic, 100 pF, 200 V, NPO, 5%, 0805 Std Std1 C26 Capacitor, ceramic, 47 pF, 50 V, NPO, 5%, 0805 Std Std1 C27 Capacitor, ceramic, 33 pF, 50 V, NPO, 5%, 1206 Std Std1 C30 Capacitor, polypropylene film, 0.56 µF, 630 V, 5% Panasonic ECW-F6564JL2 C31, C32 Capacitor, metallized polyester film, 1.0 µF, 250 V, 10% Panasonic ECQ-E2105KF1 C33 Capacitor, ceramic, 470 pF, 50 V, NPO, 5%, 0805 Std Std2 CL1, CL2 Current loop, wire, 20 AWG., stranded, 3.0 in. Std NA2 D1, D2 Diode, 1.5 A, 600 V Std BYG10J1 D3 Diode, bridge rectifier, 6 A, 600 V Std GBJ6062 D4, D16 Diode, Schottky, 1.5 A, 30 V Std SL13-E3/61T2 D5, D7 Diode, Schottky, 1 A, 90 V Std BYS11-90-E3/TR2 D6, D17 Diode, switching, 90 V, 225 mA Ifm, high speed Rohm 1SS3552 D8, D18 Diode, ultra fast, 8 A, 600 V IR HFA08TB60S2 D9, D10 Diode, Zener, 18 V, 1 W Std SMAZ18-13D11, D13, Diode, signal, 300 mA, 75 V, 35 mW3 Std 1N4148WD152 D12, D21 Diode, dual Schottky, 200 mA, 30 V Std BAT54C1 D14 Diode, Zener, 5.1 V, 1 W Std SMAZ5V1-13-FD19, D20, Diode, Zener, 500 mW, 75 V4 Std MMSZ5267BT1D22, D23
SLUU355A – March 2009 – Revised June 2009 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications 13Submit Documentation Feedback

List of Materials www.ti.com
Table 3. List of Materials (continued)
QTY REF DES DESCRIPTION MFR PART NUMBER
1 F1 Fuse, SMP, 1.25 A Bel SMP 1.251 F1 Fuse 250 V UL fast 5 X 20 MM Std Std2 FH1 Fuse clip, 5 x 20 mm, PC mount Wickmann 01000056H2 HS1, HS2 Heatsink, TO-220, vertical mount, 15 °C/W Aavid 5930021 J1 Connector, AC receptacle, board mount, R/A, 9 mm Qualtek Electronics 703W-00/542 J2, J3 Header, male 2 pin, 100-mil spacing, (36-pin strip) Sullins PTC36SAAN1 J4 Header, male 3 pin, 100-mil spacing, (36-pin strip) Sullins PTC36SAAN1 J5 Terminal block, 2 pin 9.52-mm spacing OST OSTT70221501 L1 Inductor, thru hole, 1.3 A, 126 m ΩmuRata 33331C1 L2 Transformer, 1 prim, 1 sec, 1 mH, 3.1 A Coiltronics CTX16-184841 L3 Transformer, 1 prim, 1 sec, 400 µH, 2 A Coiltronics CTX33-18428Q1, Q2, Transistor, NPN, 75 V, 500 mA4 Std MMBT2222AQ4, Q71 Q3 MOSFET, N-channel , 400 V, 10 A IR IRF8401 Q5 MOSFET, N-channel, 500 V, 6 A ST STP6NK50Z1 Q6 Bipolar, PNP, -500 V, -500 mA Zetex FMMT5602 R1, R3 Resistor, chip, 301 k Ω, 1/4 W, 1%, 1206 Std Std2 R2, R5 Resistor, chip, 1.00 M Ω, 1/4 W, 1%, 1206 Std Std1 R4 Resistor, chip, 4.02 k Ω, 1/8 W, 1%, 0805 Std Std1 R6 Resistor, chip, 6.19 k Ω, 1/8 W, 1%, 0805 Std Std2 R7, R28 Resistor, chip, 4.75 k Ω, 1/8 W, 1%, 0805 Std StdR8, R11, Resistor, chip, 10.7 k Ω, 1/8 W, 1%, 08056 R29, R30, Std StdR33, R441 R9 Resistor, chip, 24.3 k Ω, 1/8 W, 1%, 0805 Std Std1 R10 Resistor, chip, 6.81 k Ω, 1/8 W, 1%, 0805 Std Std1 R12 Resistor, chip, 332 Ω, 1/8 W, 1%, 0805 Std StdR13, R15, Resistor, chip, 511 k Ω, 1/4 W, 1%, 12064 Std StdR39, R402 R14, R16 Resistor, chip, 100 k Ω, 1/4 W, 1%, 1206 Std Std1 R17 Resistor, chip, 47.5 Ω, 1/8 W, 1%, 0805 Std Std2 R18, R37 Resistor, chip, 21.5 k Ω, 1/8 W, 1%, 0805 Std Std2 R19, R36 Resistor, chip, 10.0 Ω, 1/8 W, 1%, 0805 Std Std2 R20, R35 Resistor, chip, 0.40 Ω, 1 W, 1%, 2512 Std Std2 R22, R23 Resistor, chip, 200 Ω, 1/2 W, 1%, 1812 Std Std2 R24, R42 Resistor, chip, 10.0 k Ω, 1/8 W, 1%, 0805 Std Std2 R25, R46 Resistor, chip, 100 k Ω, 1/8 W, 1%, 0805 Std Std1 R26 Potentiometer, 3/8 cermet, single turn, flat Bourns 3362P-5041 R27 Resistor, chip, 665 Ω, 1/4 W, 1%, 1206 Std Std
14 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications SLUU355A – March 2009 – Revised June 2009Submit Documentation Feedback

www.ti.com List of Materials
Table 3. List of Materials (continued)
QTY REF DES DESCRIPTION MFR PART NUMBER
R31, R32, Resistor, chip, 15.0 k Ω, 1/8 W, 1%, 08053 Std StdR451 R34 Resistor, chip, 560 Ω, 1/8 W, 1%, 0805 Std Std1 R38 Resistor, chip, 0.47 Ω, 1 W, 1%, 2512 Std Std1 R41 Resistor, chip, 4.75 k Ω, 1/4 W, 1%, 1206 Std Std1 R43 Resistor, chip, 221 k Ω, 1/8 W, 1%, 0805 Std Std2 R47, R48 Resistor, chip, 221 k Ω, 1/4 W, 1%, 1206 Std Std1 U1 LED Lighting Power Controller TI UCC28810D1 U2 Timer, Low-Power CMOS TI TLC555D1 U3 LED Lighting Power Controller TI UCC28811D1 -- PCB, 10.4 in x 2 in x 0.062 in Any HPA439 REVA2 Washer, #4, shoulder, nylon Keystone2 Heatpad TO-220 0.009" SP900 Bergquist SP900S-902 Washer, #4 split, ss Std Std2 Nut, #4-40, ss Std Std2 Screw, #4 - 40, SS, 0.5 in. Std Std1 JP1 Connector, jumper, shorting, gold, 0.100" Sullens
SLUU355A – March 2009 – Revised June 2009 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications 15Submit Documentation Feedback

EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents orservices described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety programs, please contact the TI application engineer or visit www.ti.com/esh .No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 90 VRMS to 264 VRMS and the output voltage range of 55 VRMS to110 VRMS.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questionsconcerning 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 60 °C. The EVM is designed to operateproperly with certain components above as long as the input and output ranges are maintained. These components include but are notlimited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing 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 75265Copyright 2008, Texas Instruments Incorporated

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