Texas Instruments TPS56221EVM-579 User manual

User's Guide
SLVU446–March 2011
TPS56221EVM-579 Evaluation Module
The Texas Instruments TPS56221EVM-579 evaluation module (EVM) is a synchronous buck converter
providing a fixed 1.2-V output at up to 25 A from a 12-V input bus. The EVM is designed to start up from a
single supply; so, no additional bias voltage is required for start-up. The module uses the TPS56221
High-Current, Synchronous Buck Converter with integrated MOSFETs.
The TPS56221 integrates TI’s high-performance controller technology with TI’s industry-leading MOSFET
technology in a standard QFN package to meet the demands of modern, high-current, space-constrained
applications.
Contents
1 Introduction .................................................................................................................. 3
1.1 Description .......................................................................................................... 3
1.2 Applications ......................................................................................................... 3
1.3 Features ............................................................................................................. 3
2 TPS56221EVM-579 Electrical Performance Specifications ........................................................... 3
3 TPS56221EVM-579 Schematic ........................................................................................... 4
4 Connector and Test Point Descriptions .................................................................................. 5
4.1 Enable/SS Test Point – TP5 ...................................................................................... 5
4.2 Test Point Descriptions ............................................................................................ 5
5 Test Setup ................................................................................................................... 6
5.1 Equipment ........................................................................................................... 6
5.2 Equipment Setup ................................................................................................... 7
5.3 Start-Up/Shutdown Procedure ................................................................................... 9
5.4 Output Ripple Voltage Measurement Procedure .............................................................. 9
5.5 Control Loop Gain and Phase Measurement Procedure .................................................... 10
5.6 Equipment Shutdown ............................................................................................ 10
6 TPS56221EVM-579 Test Data .......................................................................................... 10
6.1 Efficiency .......................................................................................................... 10
6.2 Line and Load Regulation ....................................................................................... 11
6.3 Output Voltage Ripple ........................................................................................... 11
6.4 Switch Node ....................................................................................................... 12
6.5 Control Loop Bode Diagram .................................................................................... 12
7 TPS56221EVM-579 Assembly Drawings and Layout ................................................................ 13
8 TPS56221EVM-579 Bill of Materials .................................................................................... 19
List of Figures
1 TPS56221EVM-579 Schematic........................................................................................... 4
2 TPS56221EVM-579 Recommended Test Setup ....................................................................... 8
3 Output Ripple Measurement – Tip and Barrel Using TP3 and TP4.................................................. 8
4 Control Loop Measurement Setup........................................................................................ 9
5 TPS56221EVM-579 Efficiency vs Load Current ...................................................................... 10
6 TPS56221EVM-579 Output Voltage vs Load Current................................................................ 11
7 TPS56221EVM-579 Output Voltage Ripple............................................................................ 11
8 TPS56221EVM-579 Switching Waveform.............................................................................. 12
9 TPS56221EVM-579 Gain and Phase vs Frequency.................................................................. 12
1
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

www.ti.com
10 TPS56221EVM-579 Component Placement, Viewed From Top.................................................... 13
11 TPS56221EVM-579 Silk Screen, Viewed From Top ................................................................. 14
12 TPS56221EVM-579 Top Copper, Viewed From Top................................................................. 15
13 TPS56221EVM-579 Bottom Copper, Viewed From Bottom......................................................... 16
14 TPS56221EVM-579 Internal 1, X-Ray Viewed From Top............................................................ 17
15 TPS56221EVM-579 Internal 2, X-Ray Viewed From Top............................................................ 18
List of Tables
1 TPS56221EVM-579 Electrical and Performance Specifications...................................................... 3
2 Test Point Descriptions..................................................................................................... 5
3 TPS56221EVM-579 Bill of Materials.................................................................................... 19
2TPS56221EVM-579 Evaluation Module SLVU446–March 2011
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated

www.ti.com Introduction
1 Introduction
1.1 Description
TPS56221EVM-579 is designed to use a regulated 12-V (8-V to 14-V) bus voltage to provide a regulated
1.2-V output at up to 25 A of load current. TPS56221EVM-579 is designed to demonstrate the TPS56221
high-current integrated, FET converter in a typical space-limited 12-V bus to low-voltage point-of-load
application.
1.2 Applications
• High-current, low-voltage FPGA or microcontroller core supplies
• High-current, point-of-load modules
• Telecommunications equipment
• Computer peripherals
1.3 Features
• 8-V to 14-V input voltage rating
• 1.2-V ±2% output voltage rating
• Less than 400-mm2active PCB area (excluding bulk input and output capacitors)
• 25-A steady-state load current
• 500-kHz switching frequency
• Simple access to IC features including Power Good, Enable, Soft-Start, and Error Amplifier
• Convenient test points for simple, non-invasive measurements of converter performance.
2 TPS56221EVM-579 Electrical Performance Specifications
Table 1. TPS56221EVM-579 Electrical and Performance Specifications
Parameter Notes and Conditions Min Typ Max Unit
Input Characteristics
VIN Input voltage 8 12 14 V
IIN Input current VIN = 12 V, IOUT = 25 A – 2.8 3.2 A
No-load input current VIN = 12 V, IOUT = 0 A – 35 50 mA
VIN_UVLO Input UVLO IOUT = 10 A 4.2 V
Output Characteristics
VOUT1 Output Voltage 1 VIN = 12 V, IOUT = 12 A 1.17 1.2 1.23 V
Line regulation VIN = 8 V to 14 V – – 0.5%
Load regulation IOUT = 0 A to 25 A – – 1%
VOUT_ripple Output voltage ripple VIN = 12, IOUT = 25 – – 24 mVpp
IOUT1 Output Current 1 VIN = 8 to 14 0 25 A
Systems Characteristics
FSW Switching frequency 450 500 550 kHz
ηpk Peak efficiency VIN = 12 V, IOUT = 12 A – 92% –
ηFull-load efficiency VIN = 12 V, IOUT = 25 A – 89% –
3
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

+
TPS56221EVM-579 Schematic www.ti.com
3 TPS56221EVM-579 Schematic
NOTE: For Reference Only, See Table 3.
Figure 1. TPS56221EVM-579 Schematic
4TPS56221EVM-579 Evaluation Module SLVU446–March 2011
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated

www.ti.com Connector and Test Point Descriptions
4 Connector and Test Point Descriptions
4.1 Enable/SS Test Point – TP5
TPS56221EVM-579 is designed with a test point at the Enable/Soft-Start point (TP5). Shorting TP5 to
GND connects the EN/SS pin to GND, discharges the soft-start capacitor, and disables the TPS56221
converter. This forces the output into a high-impedance state (approximately 40 kΩto GND).
4.2 Test Point Descriptions
Table 2. Test Point Descriptions
Test Point Label Use Section
TP1 VIN Measurement Test Point for Input Voltage Section 4.2.1
TP2 GND Ground Test Point for Input Voltage Section 4.2.1
TP3 VOUT Measurement Test Point for Output Voltage Section 4.2.2
TP4 GND Ground Test Point for Output Voltage Section 4.2.2
TP5 Enable Measurement Test Point for Enable/Soft-Start Section 4.2.3
TP6 Power Measurement Test Point for Power Good Section 4.2.4
Good
TP7 CHA Measurement Test Point for Channel A of Loop Response Section 4.2.5
TP8 SGND Ground Test Point for Channel A of Loop Response Section 4.2.5
TP9 SGND Ground Test Point for Channel A of Loop Response Section 4.2.5
TP10 CHB Measurement Test Point for Channel B of Loop Response Section 4.2.5
4.2.1 Input Voltage Monitoring – TP1 and TP2
The TPS56221EVM-579 provides two test points for measuring the input voltage applied to the module.
This allows the user to measure the actual input module voltage without losses from input cables and
connectors. All input voltage measurements should be made between TP1 and TP2. To use TP1 and
TP2, connect a voltmeter positive input to TP1 and input terminal to TP2.
4.2.2 Output Voltage Monitoring – TP3 and TP4
The TPS56221EVM-579 provides two test points for measuring the output voltage generated by the
module. This allows the user to measure the actual module output voltage without losses from input
cables and connectors. All input voltage measurements should be made between TP3 and TP4. To use
TP3 and TP4, connect a voltmeter positive input to TP3 and negative input to TP4.
4.2.3 Enable/Soft-Start Monitoring – TP5
The TPS56221EVM-579 provides a test point for measuring the Enable/Soft-Start voltage of the
TPS56221 converter. This test point can be externally shorted to GND to disable the TPS56221 controller
or monitored to observe the start-up calibration waveform, soft-start ramp, or fault time-out timing.
The Enable/Soft-Start test point can be externally shorted to GND but must not be actively driven from an
external circuit, such as a logic output of another power supply.
4.2.4 Power Good Monitoring – TP6
The TPS56221EVM-579 provides a test point for connecting the Power Good output of the TPS56221
converter with an external circuit. To maintain compatibility with the TPS56221EVM-579 Enable/Soft-Start
testing point and allow two TPS56221EVM-579 modules to be easily sequenced, the Power Good test
point does not include an onboard pullup resistor.
When connecting to another TPS56221EVM-579 module, the Power Good test point (TP6) of one module
can be directly connected to the Enable/Soft-Start test point (TP5) of a second module to provide simple
sequential start-up sequencing.
5
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

Test Setup www.ti.com
If the Power Good test point must be connected to an external logic circuit or monitored for power-on
sequence testing, an external pullup may be required.
4.2.5 Loop Response Testing – TP7, TP8, TP8, TP10, and R5
The TPS56221EVM-579 provides four test points (two signal and two ground) for measuring the control
loop frequency response. This allows the user to measure the actual module loop response without
modifying the evaluation board. A transformer-isolated signal up to 30 mV can be injected between TP7
and TP10. The injected signal amplitude can be measured by the ac-coupled amplitude at CHA (TP7),
and the resulting output voltage deviation can be measured at CHB (TP10). See Figure 4 for additional
detail.
5 Test Setup
5.1 Equipment
5.1.1 Voltage Source
VIN:The input voltage source (VIN) must be a 0-V to 15-V variable dc source capable of supplying 3.5 Adc.
5.1.2 Meters
A1: Input current meter. 0-Adc to 5-Adc ammeter
V1: Input voltage meter. 0-V to 15-V voltmeter
V2: Output voltage meter. 0-V TO 2-V voltmeter
5.1.3 Loads
LOAD1: Output load. Electronic load set for constant current or constant resistance capable of 0-Adc to
25-Adc at 1.2 Vdc
5.1.4 Oscilloscope
For Output Voltage Ripple: Oscilloscope must be an analog or digital oscilloscope set for ac-coupled
measurement with 20-MHz bandwidth limiting. Use 20-mV/division vertical resolution, 1-µs/division
horizontal resolution.
For Switching Waveforms: Oscilloscope must be an analog or digital oscilloscope set for dc-coupled
measurement with 20-MHz bandwidth limiting. Use 2-V/division or 5-V/division vertical resolution and
1-µs/division horizontal resolution.
5.1.5 Recommended Wire Gauge
VIN to J1
The connection between the source voltage (VIN) and J1 of TPS56221EVM-579 can carry as much as 3.5
Adc of current. The minimum recommended wire size is AWG 16 with the total length of wire less than 2
feet (1-foot input, 1- foot return)
J2 to LOAD1
The connection between the source voltage (VIN) and J1 of TPS56221EVM-579 can carry as much as 25
Adc of current. The minimum recommended wire size is 2x AWG 14 with the total length of wire less than
2 feet (1-foot input, 1-foot return).
NOTE: J2 is a 4 position terminal jack using positions for each VOUT and GND. Each position is rated to
support 15A of output current. When delivering more than 15A of current, both VOUT and both GND
positions should be used.
6TPS56221EVM-579 Evaluation Module SLVU446–March 2011
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated

www.ti.com Test Setup
5.1.6 Thermal
FAN
The TPS56221EVM-579 evaluation module includes components that can become hot to the touch when
operating. Because this evaluation module is not enclosed to allow probing of circuit nodes, a small fan
capable of 200-400 lfm is recommended to reduce component temperatures when operating.
5.2 Equipment Setup
Shown in Figure 2 is the basic test setup recommended to evaluate the TPS56221EVM-579. Note that
although the return for J1 and JP2 are the same system ground, the connections must remain separate as
shown in Figure 2.
5.2.1 Procedure
1. Working at an ESD workstation, ensure that any wrist straps, bootstraps, or mats are connected
referencing the user to earth ground before power is applied to the EVM. Wearing an electrostatic
smock and safety glasses is also recommended.
2. Prior to connecting the dc input source, VIN, it is advisable to limit the source current from VIN to 4 A
maximum. Ensure that VIN is initially set to 0 V and connected as shown in Figure 2.
3. Connect VIN to J1 as shown in Figure 2.
4. Connect ammeter A1 between VIN and J1 as shown in Figure 2.
5. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 2.
6. Connect voltmeter V2 to TP3 and TP4 as shown in Figure 2.
7. Connect Oscilloscope Probes to desired test points per Table 2.
8. Locate the fan as shown in Figure 2 and turn it on, ensuring that the air blows directly across the
evaluation module.
7
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

LOAD1
1.2V @
25A
-
+
FAN
V2
-
+
See Tip and Barrel
Measurement for
Vout ripple
Oscilloscope
1MW, AC
20mV / div
20MHz
A1
-
+
V
VIN
V1
-
+
TP4TP3
Metal Ground Barrel
Probe Tip
Tip and Barrel Vout ripple
measurement
Test Setup www.ti.com
5.2.2 Diagram
Figure 2. TPS56221EVM-579 Recommended Test Setup
Figure 3. Output Ripple Measurement – Tip and Barrel Using TP3 and TP4
8TPS56221EVM-579 Evaluation Module SLVU446–March 2011
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated

FAN
LOAD1
1.2V @
25A
-
+
V2
-
+
See Tip and Barrel
Measurement for
Vout ripple
Oscilloscope
1MW, AC
20mV / div
20MHz
A1
-
+
V
VIN
V1
-
+
Network
Analyzer
Isolation
Transformer
www.ti.com Test Setup
Figure 4. Control Loop Measurement Setup
5.3 Start-Up/Shutdown Procedure
1. Increase VIN from 0 Vdc to 12 Vdc.
2. Vary LOAD1 from 0 Adc to 25 Adc.
3. Vary VIN from 8 V to 14 V.
4. Decrease VIN to 0 V.
5. Decrease LOAD1 to 0 A.
5.4 Output Ripple Voltage Measurement Procedure
1. Follow Section 5.3 Steps 1-5 to set VIN and LOAD1 to desired operating condition
2. Connect Oscilloscope Probe with exposed metal barrel to TP3 and TP4 per Figure 3
3. Set oscilloscope per Oscilloscope For Output Voltage Ripple measurement in Section 5.1.4.
4. Follow Steps 4 and 5 in Section 5.3 to power down.
9
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

æ ö
´ç ÷
è ø
ChannelB
20 LOG
ChannelA
70
75
80
85
90
95
0 5 10 15 20 25
h- Efficiency - %
I - Load Current - A
LOAD
V = 8 V
IN
V = 12 V
IN
V = 14 V
IN
V = 12 V,
V = 1.2 V,
I = 0-25 A
IN
OUT
OUT
TPS56221EVM-579 Test Data www.ti.com
5.5 Control Loop Gain and Phase Measurement Procedure
1. Follow Steps 1-5 in Section 5.3 to set Vin and LOAD1 to desired operating condition.
2. Connect a 1-kHz to 1-MHz isolation transformer to TP5 and TP7 as shown in Figure 4.
3. Connect input signal amplitude measurement probe (Channel A) to TP7 as shown in Figure 4.
4. Connect output signal amplitude measurement probe (Channel B) to TP5 as shown in Figure 4.
5. Connect ground lead of Channel A and Channel B to TP6 and TP8 as shown in Figure 4.
6. Inject a 30-mV or less signal across R3 through the isolation transformer.
7. Sweep the frequency from 1 kHz to 1 MHz with a 10-Hz or lower post filter.
8. The control loop gain can be measured by
9. The control loop phase can be measured by the phase difference between Channel A and Channel B.
10. Follow Steps 4 and 5 in Section 5.3 to power down.
5.6 Equipment Shutdown
1. Shut down oscilloscope.
2. Shut down LOAD1.
3. Shut down VIN.
4. Shut down fan.
6 TPS56221EVM-579 Test Data
Figure 5 through Figure 8 present typical performance curves for the TPS56221EVM-579. Because actual
performance data can be affected by measurement techniques and environmental variables, these curves
are presented for reference and may differ from actual field measurements.
6.1 Efficiency
Figure 5. TPS56221EVM-579 Efficiency vs Load Current
10 TPS56221EVM-579 Evaluation Module SLVU446–March 2011
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated

0 5 10 15 20 25 30
1.176
1.18
1.184
1.188
1.192
1.196
1.2
1.204
1.208
1.212
1.216
1.22
1.224
V - Output Voltage - V
O
I - Load Current - A
LOAD
V = 8 V
IN
V = 12 V
IN
V = 14 V
IN
V = 8 V-14 V,
V = 1.2 V,
I = 0-25 A
IN
OUT
OUT
TPS56221EVM-579E3
Output Ripple Vin = 14 V, Vout = 1.2 V, Iout = 25 A
www.ti.com TPS56221EVM-579 Test Data
6.2 Line and Load Regulation
Figure 6. TPS56221EVM-579 Output Voltage vs Load Current
6.3 Output Voltage Ripple
Figure 7. TPS56221EVM-579 Output Voltage Ripple
11
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

TPS56221EVM-579E3
Switch Node Vin = 14 V, Vout = 1.2 V, Iout = 25 A
Gain
Phase
-135
-90
-45
0
45
90
135
180
225
Phase - deg
-40
-20
0
20
40
60
80
100
Gain - dB
-80
0.1 1 10 100 1000
f - Frequency - kHz
TPS56221EVM-579 Test Data www.ti.com
6.4 Switch Node
Figure 8. TPS56221EVM-579 Switching Waveform
6.5 Control Loop Bode Diagram
Figure 9. TPS56221EVM-579 Gain and Phase vs Frequency
12 TPS56221EVM-579 Evaluation Module SLVU446–March 2011
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated

www.ti.com TPS56221EVM-579 Assembly Drawings and Layout
7 TPS56221EVM-579 Assembly Drawings and Layout
Figure 10 through Figure 15 show the design of the TPS56221EVM-579 printed circuit board. The EVM
has been designed using a 4-Layer, 2oz copper-clad circuit board 2.5” x 2.5” with components on both
sides of the PCB to allow the user to view, probe and evaluate the TPS56221 high current converter with
integrated FET in a small form factor, high-current application.
Figure 10. TPS56221EVM-579 Component Placement, Viewed From Top
13
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

TPS56221EVM-579 Assembly Drawings and Layout www.ti.com
Figure 11. TPS56221EVM-579 Silk Screen, Viewed From Top
14 TPS56221EVM-579 Evaluation Module SLVU446–March 2011
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated

www.ti.com TPS56221EVM-579 Assembly Drawings and Layout
Figure 12. TPS56221EVM-579 Top Copper, Viewed From Top
15
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

TPS56221EVM-579 Assembly Drawings and Layout www.ti.com
Figure 13. TPS56221EVM-579 Bottom Copper, Viewed From Bottom
16 TPS56221EVM-579 Evaluation Module SLVU446–March 2011
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated

www.ti.com TPS56221EVM-579 Assembly Drawings and Layout
Figure 14. TPS56221EVM-579 Internal 1, X-Ray Viewed From Top
17
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

TPS56221EVM-579 Assembly Drawings and Layout www.ti.com
Figure 15. TPS56221EVM-579 Internal 2, X-Ray Viewed From Top
18 TPS56221EVM-579 Evaluation Module SLVU446–March 2011
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated

www.ti.com TPS56221EVM-579 Bill of Materials
8 TPS56221EVM-579 Bill of Materials
Table 3. TPS56221EVM-579 Bill of Materials
Count RefDes Value Description Size Part Number MFR
3 C1, C2, C3 22 µF Capacitor, Ceramic, 25V, X5R, 20% 1210 Std Std
1 C11 1.0 µF Capacitor, Ceramic, 25V, X5R, 20% 0805 Std Std
1 C12 4.7 µF Capacitor, Ceramic, 10V, X5R, 20% 0805 Std Std
1 C13 22 nF Capacitor, Ceramic, 16V, X7E, 20% 0402 Std Std
1 C14 100 nF Capacitor, Ceramic, 16V, X7R, 20% 0402 Std Std
1 C15 2200 pF Capacitor, Ceramic, 25V, X7R, 10% 0402 Std Std
1 C16 33 pF Capacitor, Ceramic, 25V, C0G, 10% 0402 Std Std
1 C17 470 pF Capacitor, Ceramic, 25V, C0G, 10% 0402 Std Std
2 C18, C19 10 µF Capacitor, Ceramic, 6.3V, X5R, 20% 0805 Std Std
3 C20, C21, C22 22 µF Capacitor, Ceramic, 6.3V, X5R, 20% 1206 Std Std
5 C23, C24, C25, 47 µF Capacitor, Ceramic, 6.3V, X5R, 20% 1210 Std Std
C26, C27
1 C4 100 µF Capacitor, Aluminum, 16VDC, ±20% Code D8 EEEFP1C101AP Panasonic
1 C5 1.0 µF Capacitor, Ceramic, 25V, X7R, 20% 0805 Std Std
1 C6 3.3 µF Capacitor, Ceramic, 25V, X7R, 20% 0805 Std Std
4 C7, C8, C9, 10 µF Capacitor, Ceramic, 25V, X7R, 20% 1206 Std Std
C10
2 J1, J2 ED120/4DS Terminal Block, 4-pin, 15-A, 5.1mm 0.80 x 0.35 inch ED120/4DS OST
1 L1 320nH IND, SMT Power ±15% 0.394 x 0.476 inch PA2202-321NL Pulse Eng
1 R1 3.31k Resistor, Chip, 1/16W, 1% 0402 Std Std
1 R2 5.1 Resistor, Chip, 1/16W, 1% 0402 Std Std
1 R3 11.0k Resistor, Chip, 1/16W, 1% 0402 Std Std
2 R4, R7 20.5k Resistor, Chip, 1/16W, 1% 0402 Std Std
1 R5 49.9 Resistor, Chip, 1/16W, 5% 0402 Std Std
1 R6 1.27k Resistor, Chip, 1/16W, 1% 0402 Std Std
2 TP1, TP3 5010 Test Point, Red, Thru Hole 0.125 x 0.125 inch 5010 Keystone
4 TP2, TP4, TP8, 5011 Test Point, Black, Thru Hole 0.125 x 0.125 inch 5011 Keystone
TP9
2 TP5, TP6 5014 Test Point, Yellow, Thru Hole 0.125 x 0.125 inch 5014 Keystone
2 TP7, TP10 5012 Test Point, White, Thru Hole 0.125 x 0.125 inch 5012 Keystone
1 U1 TPS56221DQP IC, 25A 600kHz Synchronous BUCK Converter QFN-22 6X5 mm TPS56221DQP TI
1 – PCB, 2.5 In x 2.5 In x 0.063 In HPA579 Any
19
SLVU446–March 2011 TPS56221EVM-579 Evaluation Module
Submit Documentation Feedback © 2011, Texas Instruments Incorporated

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
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 AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING
ANY WARRANTY OF MERCHANTABILITY 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
claims arising 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 all appropriate 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 ANY INDIRECT, 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 or services 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. This notice contains important safety information about temperatures and voltages. For additional information on TI’s
environmental and/or safety 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, or
combination 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
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 5 V to 14 V and the output voltage range of 0.9 V to 1.8 V .
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 60° C 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.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2011, Texas Instruments Incorporated