TI1 ECK-ANA102MB A 0.9-a constant current supply with pfc for 100-w led Datasheet

Using the UCC28810EVM-002
User's Guide
Literature Number: SLUU355A
March 2009 – Revised June 2009
User's Guide
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.
2.1
Typical Applications
•
•
•
2.2
Features
•
•
•
•
•
2
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 Applications
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Electrical Performance Specifications
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3
Electrical Performance Specifications
Table 1. UCC28810EVM-002 Electrical Performance Specifications
SYMBOL
PARAMETER
CONDITIONS
MIN
NOM
MAX
UNITS
INPUT CHARACTERSTICS
VIN
Input voltage
IIN
Input current
PF
Power factor
90
0.175
POUT = 80 W to 100 W
0.95
264
VRMS
1.1
ARMS
415
VDC
W
0.97
OUTPUT CHARACTERSTICS
PFC Stage
VOUT
PFC output voltage
235
LED Driver Stage
POUT
Output power
IOUT
Output current
45
80
100
0.84
0.9
0.96
Line regulation
0.03
Frequency
60
128
A
kHz
SYSTEMS CHARACTERSTICS
η
Full load efficiency
90%
93%
PWM Dimming (1)
(1)
Threshold
0.72
1.3
V
Frequency range
200
1000
Hz
Duty cycle
0%
90%
The PWM dimming signal is inverted, 0% duty cycle is 100% LED current.
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A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
3
Schematic
Schematic
+
+
+
4
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Figure 1. UCC28810EVM-002 PFC Stage Schematic
4
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
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Schematic
GND
TZE
ISENSE
EAOUTGDRV
VINS
VSENSE VDD
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Figure 2. UCC28810EVM-002 Buck Stage Schematic
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A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
5
Test Setup
5
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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. The use of isolated test equipment is highly
recommended.
5.1
Test Equipment
See Figure 3 for recommended test set up.
5.1.1
•
•
5.1.2
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.
Multimeters
Three digital multimeters are recommend, one for current measurement, A1, and two for voltage
measurements, V1 and V2.
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-µF/250 VDC capacitor is required at the input to the electronic load. The
1000 µF 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.
6
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
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Test Setup
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5.2
Recommended Test Setup
90 - 265
VRMS
AC Source
L
CL1
Current Probe:
PFC inductor
ripple current
monitor
N
TP1 & TP2
Loop injection point
TP4 & TP5
PFC output voltage
Constant
Voltage
Load
+
-
CL2
Current Probe:
Buck inductor
ripple current
monitor
1000uF
250V
+
V2
A1
V1
IEC320
-C13
Plug
J2
Pin 1: PFC Shutdown
Pin 2: GND
TP3
Buck bias voltage monitor
J4
Pin 1: Buck Shutdown
Pin 2: GND
Pin 3 External PWM dimming input
J3
Short pins to Enable
On Board Dimming
Figure 3. UCC28810EVM-002 Recommended Test Set Up
Note:
5.3
The 1000-µF/250-V capacitor on the output is not required if the load is a string of HB-LED’s.
List of Test Points
Table 2. Test Point Functions
TEST POINTS
NAME
TP1
DESCRIPTION
Loop injection point
TP2
Loop injection point, PFC output
TP3
VCC_BK
TP4
PFC+
PFC output voltage
TP5
PFC-
PFC output voltage ground
TP6
VCC_BK
TP7
GND
Buck bias voltage ground
TP8
GND
Ground connection
TP9
EN
TP10
GND
TP11
BK_IN
J2-1
PFC shutdown
J2-2
GND
J4-1
BK_Shutdown
J4-2
GND
J4-3
PWM Dim
J3
On board dim
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Buck bias voltage output
Buck bias voltage input
Buck enable
Buck input voltage ground
Buck input voltage
Apply 3.3 V to this pin to shutdown PFC stage
Apply 3.3 V to this pin to shutdown buck stage
Input for external PWM dimming
Short the two pins on J3 to enable on board PWM diming. R26
varies dimming duty cycle
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
7
Test Procedure
6
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Test Procedure
All tests will use the set up described in Section 5 of this user guide. Ensure potentiometer R26 is rotated
completely clockwise.
WARNING
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.
2.
3.
4.
Set up the EVM as described in Section 5 of this user guide.
Ensure the AC source is off.
Ensure potentiometer R26 is rotated completely clockwise.
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-µF/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.
6.2
Line/Load Regulation and Efficiency Measurement Procedure
1.
2.
3.
4.
5.
6.
7.
8.
6.3
PFC Disable
1.
2.
3.
4.
5.
6.
7.
8
Apply power to the EVM per Section 6.1.
Vary the constant voltage load from 110 V to 55 V.
Observe output current on A1 stays constant.
Vary AC source from 90 VRMS to 264 VRMS.
Observe output current on A1 stays constant.
PFC inductor ripple current can be measured at CL1 using an oscilloscope and current probe.
The buck output inductor current can be measured at CL2 using an oscilloscope and current probe.
See Section 7 for some typical test results.
Ensure the AC source is off.
Connect a DC source to J2.
Set DC source to 0 V.
Apply power to the EVM per Section 6.1.
Increase DC source to 3.3 V. This input can accept up to 12 V.
Observe PFC output voltage reduces, V2.
PFC inductor ripple current looses high frequency component.
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
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Test Procedure
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6.4
Buck Disable
1.
2.
3.
4.
5.
6.
7.
6.5
Internal Dimming Function
1.
2.
3.
4.
5.
6.6
Ensure the AC source is off.
Connect a DC source to J4, pins 1 and 2.
Set DC source to 0 V.
Apply power to the EVM per Section 6.1.
Increase DC source to 3.3 V. This input can accept up to 12 V.
Observe output current, A1, drops to zero.
PFC voltage, V2, does not change.
Ensure the AC source is off.
Ensure jumper is present on J3.
Apply power to the EVM per Section 6.1.
Rotate R26 potentiometer slowly anti clockwise.
Observe output current on A1 reduce from nominal 0.9 A to 0.1 A. If LED string is attached observe
LED’s dim.
External Dimming Function
1.
2.
3.
4.
Ensure the AC source is off.
Ensure jumper is removed from J3.
Connect signal generator to J4, pins 3 and 2.
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.
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 kΩ.
3. The EVM now uses a fixed output voltage PFC stage. Repeat tests to see functionality.
6.8
Equipment Shutdown
1.
2.
3.
4.
If DC sources are connected to shutdown pins, J2 and J4, ensure they are set to 0 V.
Ensure load is at maximum, this will help discharge C17.
Turn off AC source.
Monitor PFC output voltage V2. Do not handle EVM until V2 reads less than 50 VDC.
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Performance Data and Typical Characteristic Curves
7
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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.
EFFICIENCY/POWER FACTOR
vs
LINE VOLTAGE
TOTAL HARMONIC DISTORTION
vs
LINE VOLTAGE
12
0.98
Power Factor
0.96
0.94
0.92
Efficiency
0.90
0.88
THD - Total Harmonic Distortion - %
PF - Power Factor and Efficiency - %
1.00
10
8
6
4
2
0
80
100 120 140 160 180
200 220 240 260
80
100 120 140 160 180
VRMS - Line Voltage - V
Figure 4.
7.1
200 220 240 260
VRMS - Line Voltage - V
Figure 5.
Transient
TRANSITION MODE BUCK PWM RESPONSE
(Ch1 and Ch 4 share GND reference)
TRANSITION MODE BUCK PWM RESPONSE EXPANDED
(Ch1 and Ch4 share GND reference)
Ch1:
Buck VIN
Ch3:
LED Current
Ch1:
Buck VIN
Ch4:
LED Voltage
0.5 A/div.
Ch4:
LED Voltage
0.5 A/div.
Ch2:
Buck VDS
Ch2:
Buck VDS
Ch3: LED
Current
Figure 6.
10
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
Figure 7.
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Performance Data and Typical Characteristic Curves
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7.2
Input Current
TRANSITION MODE BUCK PWM AND LINE INPUT CURRENT
(Ch1 and Ch4 share GND reference)
Ch1:
Buck VIN
Ch3:
AC Input
Current
Ch4:
LED VOUT
Ch2:
Buck VDS
Figure 8.
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A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
11
EVM Assembly Drawing and PCB layout
8
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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)
Figure 10. UCC28810EVM-002 Top Copper (top view)
Figure 11. UCC28810EVM-002 Bottom Layer (viewed through top layer)
12
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
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List of Materials
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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
C1
Capacitor, ceramic, 10 µF, 25 V, X5R, 20%, 1206
Std
Std
C2, C5
Capacitor, metallized polyester film, 0.1 µF, 275 VAC,
10%, X2, 17.5 mm x 5.5 mm
Std
Std
2
C3, C4
Capacitor, ceramic disc, 1 nF, 250 V, Y1/X1
Panasonic
ECK-ANA102MB
1
C6
Capacitor, ceramic, 2.2 µF, 25 V, X7R, 10%, 0805
Std
Std
6
C7, C9,
Capacitor, ceramic, 1 nF, 50 V, NPO, 5%, 0805
C10, C21,
C23, C25
Std
Std
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
3
C12, C28, Capacitor, ceramic, 1 µF, 25 V, X5R, 10%, 0805
C34
Std
Std
3
C13, C20, Capacitor, ceramic, 0.1 µF, 25 V, X7R, 10%, 0805
C29
Std
Std
1
C14
Capacitor, polypropylene film, 0.56 µF, 400 V, 5%
Panasonic
ECW-F4564JL
C15, C16
Capacitor, aluminum electrolytic, 100 µF, 35 V, 20%, 6.3
mm x 11.5 mm
Std
Std
1
C17
Capacitor, aluminum electrolytic, 82 µF, 450 V, TS-HB
Panasonic
ECO-S2WB820BA
1
C18
Capacitor, ceramic, 10 µF, 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 µF, 630 V, 5%
Panasonic
ECW-F6564JL
2
C31, C32
Capacitor, metallized polyester film, 1.0 µF, 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
3
D11, D13, Diode, signal, 300 mA, 75 V, 35 mW
D15
Std
1N4148W
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
4
D19, D20, Diode, Zener, 500 mW, 75 V
D22, D23
Std
MMSZ5267BT1
1
2
2
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List of Materials
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Table 3. List of Materials (continued)
QTY
14
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 mΩ
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 µH, 2 A
Coiltronics
CTX33-18428
4
Q1, Q2,
Q4, Q7
Transistor, NPN, 75 V, 500 mA
Std
MMBT2222A
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 kΩ, 1/4 W, 1%, 1206
Std
Std
2
R2, R5
Resistor, chip, 1.00 MΩ, 1/4 W, 1%, 1206
Std
Std
1
R4
Resistor, chip, 4.02 kΩ, 1/8 W, 1%, 0805
Std
Std
1
R6
Resistor, chip, 6.19 kΩ, 1/8 W, 1%, 0805
Std
Std
2
R7, R28
Resistor, chip, 4.75 kΩ, 1/8 W, 1%, 0805
Std
Std
6
R8, R11, Resistor, chip, 10.7 kΩ, 1/8 W, 1%, 0805
R29, R30,
R33, R44
Std
Std
1
R9
Resistor, chip, 24.3 kΩ, 1/8 W, 1%, 0805
Std
Std
1
R10
Resistor, chip, 6.81 kΩ, 1/8 W, 1%, 0805
Std
Std
1
R12
Resistor, chip, 332 Ω, 1/8 W, 1%, 0805
Std
Std
4
R13, R15, Resistor, chip, 511 kΩ, 1/4 W, 1%, 1206
R39, R40
Std
Std
2
R14, R16
Resistor, chip, 100 kΩ, 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 kΩ, 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, 200Ω, 1/2 W, 1%, 1812
Std
Std
2
R24, R42
Resistor, chip, 10.0 kΩ, 1/8 W, 1%, 0805
Std
Std
2
R25, R46
Resistor, chip, 100 kΩ, 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
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
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List of Materials
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Table 3. List of Materials (continued)
QTY
REF DES
DESCRIPTION
3
R31, R32, Resistor, chip, 15.0 kΩ, 1/8 W, 1%, 0805
R45
1
R34
1
R38
1
1
MFR
PART NUMBER
Std
Std
Resistor, chip, 560 Ω, 1/8 W, 1%, 0805
Std
Std
Resistor, chip, 0.47 Ω, 1 W, 1%, 2512
Std
Std
R41
Resistor, chip, 4.75 kΩ, 1/4 W, 1%, 1206
Std
Std
R43
Resistor, chip, 221 kΩ, 1/8 W, 1%, 0805
Std
Std
2
R47, R48
Resistor, chip, 221 kΩ, 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
Connector, jumper, shorting, gold, 0.100"
Sullens
1
JP1
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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
measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does
not 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 from
the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER
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Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This
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FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
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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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Copyright 2008, Texas Instruments Incorporated
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