Texas Instruments UCC28810EVM-002 User Manual

Using the UCC28810EVM-002

User's Guide

Literature Number: SLUU355A

March 2009 – Revised June 2009

SLUU355A – March 2009 – Revised June 2009

A 0.9-A Constant Current Supply with PFC for 100-W LED

Lighting Applications

1 Introduction

The UCC28810EVM-002 is a constant current non-isolated power supply for LED lighting applications. It
will convert universal mains (90 VRMS to 264 VRMS) to a 0.9-A constant current into a 100-W load. This
evaluation module will allow the customer evaluate the UCC28810/11 in a typical LED lighting application.

2 Description

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 or

power factor requirements set out by various standards, such as EN61000-3-2. The PFC circuit converts
the AC input to a regulated DC voltage. This DC voltage can be configured in one of two ways. The
default configuration of the module is that of a boost follower type PFC. The boost follower PFC is where
the PFC regulated output DC voltage tracks the AC input peak voltage. The second configuration requires
removing some components and changing a resistor value see below for more details. This second
configuration removes the tracking element of the PFC circuit. The PFC DC output voltage will then be
regulated 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 PFC
output voltage to a fixed constant current. This circuit is capable of supplying 0.9 A into a 100-W load. It
also accepts PWM dimming inputs. Alternatively the user can use the PWM circuit on the module to see
the dimming function.

This module will work with most high brightness LED’s (HB-LED) that operate with 0.9 A and a total string
voltage drop of between 55 V and 110 V.

User's Guide

2.1 Typical Applications

• 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

2.2 Features

• 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 2009

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3 Electrical Performance Specifications

SYMBOL PARAMETER CONDITIONS MIN NOM MAX UNITS

INPUT CHARACTERSTICS

V
I

IN

PF Power factor P

OUTPUT CHARACTERSTICS
PFC Stage

V

LED Driver Stage

P
I

OUT

SYSTEMS CHARACTERSTICS

η Full load efficiency 90% 93%

PWM Dimming

Input voltage 90 264 V

IN

Input current 0.175 1.1 A

PFC output voltage 235 415 VDC

OUT

Output power 45 80 100 W

OUT

Output current 0.84 0.9 0.96
Line regulation 0.03
Frequency 60 128 kHz

Threshold 0.72 1.3 V
Frequency range 200 1000 Hz
Duty cycle 0% 90%

Table 1. UCC28810EVM-002 Electrical Performance Specifications

(1)

Electrical Performance Specifications

= 80 W to 100 W 0.95 0.97

OUT

RMS
RMS

A

(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 3

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++

+

Schematic

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4 Schematic

Figure 1. UCC28810EVM-002 PFC Stage Schematic

4 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications SLUU355A – March 2009 – Revised June 2009

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VSENSE

EAOUT

VINS

ISENSE TZE

GND

GDRV

VDD

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Schematic

Figure 2. UCC28810EVM-002 Buck Stage Schematic

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Test Setup

5 Test Setup

5.1 Test Equipment

See Figure 3 for recommended test set up.

5.1.1 Voltage Source:

• 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.

5.1.2 Multimeters

Three digital multimeters are recommend, one for current measurement, A1, and two for voltage
measurements, V1 and V2.

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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. The use of isolated test equipment is highly
recommended.

5.1.3 Output Load

It is recommended that actual high brightness LED’s (HB-LED’s) are used for the load. They should be
rated at 0.9 A. The HB-LED’s should be connected in series. Their voltage drop should be between 55
VDC and 110 VDC. Alternatively a constant voltage electronic load could be used. If using a constant
voltage electronic load a 1000- µ F/250 VDC capacitor is required at the input to the electronic load. The
1000 µ F capacitor should not be used if using HB-LED’s as the load.

5.1.4 Oscilloscope

A digital or analog oscilloscope with current probe is required to view the AC current in the PFC inductor
or buck inductor.

5.1.5 Signal Generator

A signal generator that can produce a square wave pulse train at between 200 Hz and 1 kHz is required
to do external PWM dimming.

5.1.6 Fan

Forced air cooling is not required

5.1.7 Recommended Wire Gauge

A minimum of 18 AWG wire is recommended. Also the wire connections between the AC source and the
EVM, and the EVM and load should be less than two feet long. The AC input connector accepts a
standard 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 2009

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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

+ -

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5.2 Recommended Test Setup

Test Setup

Figure 3. UCC28810EVM-002 Recommended Test Set Up

Note: The 1000- µ F/250-V capacitor on the output is not required if the load is a string of HB-LED’s.

5.3 List of Test Points

Table 2. Test Point Functions

TEST POINTS NAME DESCRIPTION

TP1 Loop injection point
TP2 Loop injection point, PFC output
TP3 VCC_BK Buck bias voltage output
TP4 PFC+ PFC output voltage
TP5 PFC- PFC output voltage ground
TP6 VCC_BK Buck bias voltage input
TP7 GND Buck bias voltage ground
TP8 GND Ground connection

TP9 EN Buck enable
TP10 GND Buck input voltage ground
TP11 BK_IN Buck input voltage

J2-1 PFC shutdown Apply 3.3 V to this pin to shutdown PFC stage

J2-2 GND

J4-1 BK_Shutdown Apply 3.3 V to this pin to shutdown buck stage

J4-2 GND

J4-3 PWM Dim Input for external PWM dimming

J3 On board dim

Short the two pins on J3 to enable on board PWM diming. R26
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 7

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Test Procedure

6 Test Procedure

All tests will use the set up described in Section 5 of this user guide. Ensure potentiometer R26 is rotated
completely clockwise.

HIGH VOLTAGE levels are present on this evaluation module
whenever it is energized. Proper precautions must be observed
whenever working with this module. There is an energy storage
capacitor (C17) on this module which must be discharged before
the board can be handled. Serious injury can occur if proper safety
procedures are not followed.

6.1 Applying Power to the EVM

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 voltage
drop, when operating, is between 55 V to 110 V nominal. Note the 1000- µ F/250 V capacitor is not
required 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.

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WARNING

6.2 Line/Load Regulation and Efficiency Measurement Procedure

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.

6.3 PFC Disable

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.

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6.4 Buck Disable

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.

6.5 Internal Dimming Function

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 observe
LED’s dim.

6.6 External Dimming Function

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. Note
when 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.

Test Procedure

6.7 Configuring the PFC Stage for Fixed Output

The EVM ships configured as a boost follower PFC. Using a soldering iron some simple component
modifications 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.

6.8 Equipment Shutdown

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 9

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80 100 120 140 200 220 260

V

RMS

-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

V

RMS

-LineVoltage-V

160 180 240

TOTAL HARMONICDISTORTION

vs

LINEVOLTAGE

Ch2:

BuckV

DS

Ch4:

LEDVoltage

0.5 A/div.

Ch3:

LEDCurrent

Ch1:

BuckV

IN

TRANSITIONMODEBUCKPWMRESPONSE

(Ch1andCh4shareGNDreference)

Ch2:

BuckV

DS

Ch4:

LEDVoltage

0.5 A/div.

Ch3:LED

Current

Ch1:

BuckV

IN

TRANSITIONMODEBUCKPWMRESPONSEEXPANDED

(Ch1andCh4shareGNDreference)

Performance Data and Typical Characteristic Curves

7 Performance Data and Typical Characteristic Curves

Figure 4 through Figure 8 present some typical performance curves for the UCC28810EVM-002 with 30

Cree XRE LED’s at 900 mA.

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Figure 4. Figure 5.

7.1 Transient

A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications10 SLUU355A – March 2009 – Revised June 2009

Figure 6. Figure 7.

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Ch2:

BuckV

DS

Ch4:

LEDV

OUT

Ch3:

ACInput

Current

Ch1:

BuckV

IN

TRANSITIONMODEBUCKPWM ANDLINEINPUTCURRENT

(Ch1andCh4shareGNDreference)

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7.2 Input Current

Performance Data and Typical Characteristic Curves

Figure 8.

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EVM Assembly Drawing and PCB layout

8 EVM Assembly Drawing and PCB layout

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)

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Figure 10. UCC28810EVM-002 Top Copper (top view)

Figure 11. UCC28810EVM-002 Bottom Layer (viewed through top layer)

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9 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 µ F, 25 V, X5R, 20%, 1206 Std Std

C2, C5 Capacitor, metallized polyester film, 0.1 µ F, 275 VAC,

2 Std Std
2 C3, C4 Capacitor, ceramic disc, 1 nF, 250 V, Y1/X1 Panasonic ECK-ANA102MB

1 C6 Capacitor, ceramic, 2.2 µ F, 25 V, X7R, 10%, 0805 Std Std

C7, C9, Capacitor, ceramic, 1 nF, 50 V, NPO, 5%, 0805

6 C10, C21, Std Std

C23, C25
1 C8 Capacitor, ceramic, 330 nF, 16 V, X7R, 10%, 0805 Std Std
1 C11 Capacitor, ceramic, 18 pF, 50 V, NPO, 5%, 1206 Std Std

C12, C28, Capacitor, ceramic, 1 µ F, 25 V, X5R, 10%, 0805

3 Std Std

C34

C13, C20, Capacitor, ceramic, 0.1 µ F, 25 V, X7R, 10%, 0805

3 Std Std

C29
1 C14 Capacitor, polypropylene film, 0.56 µ F, 400 V, 5% Panasonic ECW-F4564JL

C15, C16 Capacitor, aluminum electrolytic, 100 µ F, 35 V, 20%, 6.3

2 Std Std
1 C17 Capacitor, aluminum electrolytic, 82 µ F, 450 V, TS-HB Panasonic ECO-S2WB820BA

1 C18 Capacitor, ceramic, 10 µ F, 25 V, X7R, 10%, 1210 Std Std
2 C19, C22 Capacitor, ceramic, 10 nF, 50 V, X7R, 10%, 0805 Std Std
1 C24 Capacitor, ceramic, 100 pF, 200 V, NPO, 5%, 0805 Std Std
1 C26 Capacitor, ceramic, 47 pF, 50 V, NPO, 5%, 0805 Std Std
1 C27 Capacitor, ceramic, 33 pF, 50 V, NPO, 5%, 1206 Std Std
1 C30 Capacitor, polypropylene film, 0.56 µ F, 630 V, 5% Panasonic ECW-F6564JL
2 C31, C32 Capacitor, metallized polyester film, 1.0 µ F, 250 V, 10% Panasonic ECQ-E2105KF
1 C33 Capacitor, ceramic, 470 pF, 50 V, NPO, 5%, 0805 Std Std
2 CL1, CL2 Current loop, wire, 20 AWG., stranded, 3.0 in. Std NA
2 D1, D2 Diode, 1.5 A, 600 V Std BYG10J
1 D3 Diode, bridge rectifier, 6 A, 600 V Std GBJ606
2 D4, D16 Diode, Schottky, 1.5 A, 30 V Std SL13-E3/61T
2 D5, D7 Diode, Schottky, 1 A, 90 V Std BYS11-90-E3/TR
2 D6, D17 Diode, switching, 90 V, 225 mA Ifm, high speed Rohm 1SS355
2 D8, D18 Diode, ultra fast, 8 A, 600 V IR HFA08TB60S
2 D9, D10 Diode, Zener, 18 V, 1 W Std SMAZ18-13

D11, D13, Diode, signal, 300 mA, 75 V, 35 mW

3 Std 1N4148W

D15
2 D12, D21 Diode, dual Schottky, 200 mA, 30 V Std BAT54C
1 D14 Diode, Zener, 5.1 V, 1 W Std SMAZ5V1-13-F

D19, D20, Diode, Zener, 500 mW, 75 V

4 Std MMSZ5267BT1

D22, D23

10%, X2, 17.5 mm x 5.5 mm

mm x 11.5 mm

List of Materials

SLUU355A – March 2009 – Revised June 2009 A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications 13

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List of Materials

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Table 3. List of Materials (continued)

QTY REF DES DESCRIPTION MFR PART NUMBER

1 F1 Fuse, SMP, 1.25 A Bel SMP 1.25
1 F1 Fuse 250 V UL fast 5 X 20 MM Std Std
2 FH1 Fuse clip, 5 x 20 mm, PC mount Wickmann 01000056H
2 HS1, HS2 Heatsink, TO-220, vertical mount, 15 ° C/W Aavid 593002
1 J1 Connector, AC receptacle, board mount, R/A, 9 mm Qualtek Electronics 703W-00/54
2 J2, J3 Header, male 2 pin, 100-mil spacing, (36-pin strip) Sullins PTC36SAAN
1 J4 Header, male 3 pin, 100-mil spacing, (36-pin strip) Sullins PTC36SAAN
1 J5 Terminal block, 2 pin 9.52-mm spacing OST OSTT7022150
1 L1 Inductor, thru hole, 1.3 A, 126 m Ω muRata 33331C
1 L2 Transformer, 1 prim, 1 sec, 1 mH, 3.1 A Coiltronics CTX16-18484
1 L3 Transformer, 1 prim, 1 sec, 400 µ H, 2 A Coiltronics CTX33-18428

Q1, Q2, Transistor, NPN, 75 V, 500 mA

4 Std MMBT2222A

Q4, Q7
1 Q3 MOSFET, N-channel , 400 V, 10 A IR IRF840
1 Q5 MOSFET, N-channel, 500 V, 6 A ST STP6NK50Z
1 Q6 Bipolar, PNP, -500 V, -500 mA Zetex FMMT560
2 R1, R3 Resistor, chip, 301 k Ω , 1/4 W, 1%, 1206 Std Std
2 R2, R5 Resistor, chip, 1.00 M Ω , 1/4 W, 1%, 1206 Std Std
1 R4 Resistor, chip, 4.02 k Ω , 1/8 W, 1%, 0805 Std Std
1 R6 Resistor, chip, 6.19 k Ω , 1/8 W, 1%, 0805 Std Std
2 R7, R28 Resistor, chip, 4.75 k Ω , 1/8 W, 1%, 0805 Std Std

R8, R11, Resistor, chip, 10.7 k Ω , 1/8 W, 1%, 0805
6 R29, R30, Std Std

R33, R44
1 R9 Resistor, chip, 24.3 k Ω , 1/8 W, 1%, 0805 Std Std
1 R10 Resistor, chip, 6.81 k Ω , 1/8 W, 1%, 0805 Std Std
1 R12 Resistor, chip, 332 Ω , 1/8 W, 1%, 0805 Std Std

R13, R15, Resistor, chip, 511 k Ω , 1/4 W, 1%, 1206

4 Std Std

R39, R40
2 R14, R16 Resistor, chip, 100 k Ω , 1/4 W, 1%, 1206 Std Std
1 R17 Resistor, chip, 47.5 Ω , 1/8 W, 1%, 0805 Std Std
2 R18, R37 Resistor, chip, 21.5 k Ω , 1/8 W, 1%, 0805 Std Std
2 R19, R36 Resistor, chip, 10.0 Ω , 1/8 W, 1%, 0805 Std Std
2 R20, R35 Resistor, chip, 0.40 Ω , 1 W, 1%, 2512 Std Std
2 R22, R23 Resistor, chip, 200 Ω , 1/2 W, 1%, 1812 Std Std
2 R24, R42 Resistor, chip, 10.0 k Ω , 1/8 W, 1%, 0805 Std Std
2 R25, R46 Resistor, chip, 100 k Ω , 1/8 W, 1%, 0805 Std Std
1 R26 Potentiometer, 3/8 cermet, single turn, flat Bourns 3362P-504
1 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 2009

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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%, 0805

3 Std Std

R45
1 R34 Resistor, chip, 560 Ω , 1/8 W, 1%, 0805 Std Std
1 R38 Resistor, chip, 0.47 Ω , 1 W, 1%, 2512 Std Std
1 R41 Resistor, chip, 4.75 k Ω , 1/4 W, 1%, 1206 Std Std
1 R43 Resistor, chip, 221 k Ω , 1/8 W, 1%, 0805 Std Std
2 R47, R48 Resistor, chip, 221 k Ω , 1/4 W, 1%, 1206 Std Std
1 U1 LED Lighting Power Controller TI UCC28810D
1 U2 Timer, Low-Power CMOS TI TLC555D
1 U3 LED Lighting Power Controller TI UCC28811D
1 -- PCB, 10.4 in x 2 in x 0.062 in Any HPA439 REVA
2 Washer, #4, shoulder, nylon Keystone
2 Heatpad TO-220 0.009" SP900 Bergquist SP900S-90
2 Washer, #4 split, ss Std Std
2 Nut, #4-40, ss Std Std
2 Screw, #4 - 40, SS, 0.5 in. Std Std
1 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 15

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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 PURPOSES

ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have
electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental
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Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
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FCC Warning

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio

frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are
designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may
be 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 to
110 VRMS.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning 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 operate
properly with certain components above as long as the input and output ranges are maintained. These components include but are not
limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using 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.

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