Texas Instruments TPS53127EVM-614 User Manual

User's Guide

SLVU434–February 2011

TPS53127EVM-614

The TPS53127EVM-614 Dual Output BUCK presents an easy to use reference design for a common dual output power supply using the TPS53127 controller in cost sensitive applications.

Contents

1 Introduction .................................................................................................................. 2

1.1 Description .......................................................................................................... 2

1.2 Application .......................................................................................................... 2

1.3 Features ............................................................................................................. 2

2 Electrical Performance Specifications .................................................................................... 3

3 TPS53127EVM-614 Schematic ........................................................................................... 4

4 Connector and Test Point Descriptions .................................................................................. 5

4.1 Enable Switches (SW1 and SW2) ............................................................................... 5

4.2 Switching Frequency Select Switch (SW3) ..................................................................... 5

4.3 Test Point Descriptions ............................................................................................ 5

5 Test Setup ................................................................................................................... 6

5.1 Equipment ........................................................................................................... 6

5.2 Equipment Setup ................................................................................................... 7

5.3 Start Up/Shut Down Procedure .................................................................................. 9

5.4 Output Ripple Voltage Measurement Procedure .............................................................. 9

5.5 Equipment Shutdown .............................................................................................. 9

6 TPS53127EVM-614 Test Data ............................................................................................ 9

6.1 Efficiency .......................................................................................................... 10

6.2 Line and Load Regulation ....................................................................................... 11

6.3 Output Voltage Ripple and Switching Node waveforms ..................................................... 12

6.4 Switch Node ....................................................................................................... 13

7 TPS53127EVM-614 EVM Assembly Drawings and Layout .......................................................... 14

8 Bill of Materials ............................................................................................................. 17

1 TPS53127EVM-614 Schematic........................................................................................... 4

2 Tip and Barrel Measurement for Output Voltage Ripple............................................................... 6

3 TPS53127EVM-614 Recommended Test Setup ....................................................................... 8

4 Efficiency vs Load (VIN= 8 V–22 V, V 5 Efficiency vs Load (VIN= 8 V–22 V, V 6 Output Voltage vs Load (VIN= 8 V–22 V, V 7 Output Voltage vs Load (VIN= 8 V–22 V, V 8 Output Voltage Ripple (VIN= 12 V, V 9 Output Voltage Ripple (VIN= 12 V, V 10 Switching Waveform (VIN= 12 V, V 11 Switching Waveform (VIN= 12 V, V

12 Top Assembly.............................................................................................................. 14

13 Bottom Assembly.......................................................................................................... 14

14 Top Layer................................................................................................................... 15

15 Bottom Layer............................................................................................................... 15

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List of Figures

= 1.05 V, I

OUT1

= 1.8 V, I

OUT2

= 1.05 V, I

OUT1

= 1.05 V, I

OUT2

= 1.05 V, I

OUT1

= 1.8 V, I

OUT2

= 1.05 V, I

OUT1

= 1.8 V, I

OUT2

- 0 A–4A)................................................. 10

OUT1

- 0 A–4A) .................................................. 10

OUT2

= 0 A–4 A)......................................... 11

OUT1

= 0 A–4 A)......................................... 11

OUT2

= 4 A)...................................................... 12

OUT1

= 4 A) ....................................................... 12

OUT2

= 4 A) ....................................................... 13

OUT1

= 4 A)......................................................... 13

Introduction

16 Internal Layer 1............................................................................................................ 16

17 Internal Layer 2............................................................................................................ 16

1 TPS53127EVM-614 Electrical and Performance Specifications...................................................... 3

2 TPS53127EVM-614 Test Points Description............................................................................ 5

3 TPS53127EVM-614 Bill of Materials.................................................................................... 17

1 Introduction

1.1 Description

The TPS53127EVM-614 Dual Output BUCK evaluation board provides the user with a convenient way to evaluate the TPS53127 Dual D-CAP2 mode control BUCK controller in a realistic cost sensitive application. Providing both a low “core-type” 1.05V and “I/O type” 1.8V output at up to 4A from a loosely regulated 12V (8V-22V) source, the TPS53127EVM-614 includes switches and test-points to assist a user in evaluating the performance of the TPS53127 controller in their application.

1.2 Application

• Digital television

• Set-top box

• DSL and cable modems

• Cost-sensitive digital consumer products

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List of Tables

1.3 Features

• 8-V to 22-V input

• 1.05-V and 1.8-V output

• Up to 4 A per channel output

• 700-kHz pseudo-fixed frequency D-CAP2 mode control

• Independent enable switches for power-on/power-off testing

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2 Electrical Performance Specifications

Table 1. TPS53127EVM-614 Electrical and Performance Specifications

Parameter Notes and Conditions MIN TYP MAX UNIT

INPUT CHARACTERISTICS

IN_UVLO

OUTPUT CHARACTERISTICS

OUT1

OUT1_rip

OUT1

OUT2

OUT2_rip

OUT2

SYSTEMS CHARACTERISTICS

ηpk Peak Efficiency VIN= 12 V – 85% – η Full Load Efficiency VIN= 12 V, I

Input Voltage 8 12 22 V Input Current VIN= 12 V, I No Load Input Current VIN= 12 V, I Input UVLO I

= 4 A 4.0 4.2 4.5 V

OUT

Output Voltage 1 VIN= 12 V, I Line Regulation VIN= 8 V to 22 V – – 1% Load Regulation I

= 0 A to 4 A – – 1%

OUT1

Output Voltage Ripple VIN= 12 V, I Output Current 1 VIN= 8 V to 22 V 0 4 A Output Voltage 2 VIN= 12 V, I Line Regulation VIN= 8 V to 22 V – – 1% Load Regulation I

= 0 A to 4 A – – 1%

OUT2

Output Voltage Ripple VIN= 12 V, I Output Current 2 VIN= 8 V to 22 V 0 4 A

Switching Frequency 350 700 800 kHz

Electrical Performance Specifications

= 4 A, I

OUT1

= 0 A – 20 35 mA

OUT

= 2 A 1.03 1.05 1.07 V

OUT1

= 4 A – - 30 mVpp

OUT2

= 2 A 1.78 1.80 1.82 V

OUT2

= 4 A – – 30 mVpp

OUT2

= 4 A – 83% –

OUT1

= 4 A – 1.2 1.5 A

OUT2

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TPS53127EVM-614 Schematic

3 TPS53127EVM-614 Schematic

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NOTE: For Reference Only, See Table 3 for Specific Values.

Figure 1. TPS53127EVM-614 Schematic

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4 Connector and Test Point Descriptions

4.1 Enable Switches (SW1 and SW2)

TPS53127EVM-614 includes independent enable switches for each of the two outputs. When the switch is in the DIS position, the channel is disabled and discharged per the TPS53127’s internal discharge characteristics.

To Enable VOUT1, place SW1 in the EN position To Enable VOUT2, place SW2 in the EN position

4.2 Switching Frequency Select Switch (SW3)

TPS53127EVM-614 does not populate SW3. When using TPS53127EVM-614 to evaluate the TPS53126 controller in the TSSOP package, SW3 can be populated to allow selection of the TPS53126 switching frequency between 350 kHz and 700 kHz.

4.3 Test Point Descriptions

Table 2 lists the test points, their labels, uses, and where additional information is located.

Table 2. TPS53127EVM-614 Test Points Description

Test Point Label Use Section

TP1 TEST1 Monitor Channel 1 Soft-Start Voltage Section 4.3.4 TP2 TEST2 Monitor Channel 2 Soft-Start Voltage Section 4.3.4 TP3 GND Ground for Input Voltage Section 4.3.1 TP4 GND Ground for Channel 1 Output Voltage Section 4.3.2 TP5 SW1 Monitor Switching Node for Channel 1 Section 4.3.5 TP6 GND Ground for Channel 2 Output Voltage Section 4.3.3 TP7 VO2 Monitor Output Voltage for Channel 2 Section 4.3.3 TP8 VO1 Monitor Output Voltage for Channel 1 Section 4.3.2

TP9 VIN Monitor Input Voltage Section 4.3.1 TP10 VREG5 Monitor Output of VREG5 Regulator Section 4.3.6 TP11 SW2 Monitor Switching Node for Channel 2 Section 4.3.5

CN1 VOUT1 Monitor Output Voltage for Channel 1 Section 4.3.2

CN2 VOUT2 Monitor Output Voltage for Channel 2 Section 4.3.3

Connector and Test Point Descriptions

4.3.1 Input Voltage Monitoring (TP3 and TP9)

TPS53127EVM-614 provides two test points for measuring the voltage applied to the module. This allows the user to measure the actual module voltage without losses from input cables and connectors. All input voltage measurements should be made between TP9 and TP3. To use TP9 and TP3, connect a voltmeter positive terminal to TP9 and negative terminal to TP3.

4.3.2 Channel 1 Output Voltage Monitoring (TP4 and TP8)

TPS53127EVM-614 provides two test points for measuring the voltage generated at the VO1 Output by the module. This allows the user to measure the actual output voltage without losses from output cables and connectors. All DC Output voltage measurements should be made between TP8 and TP4. To use TP8 and TP4, connect a voltmeter positive terminal to TP8 and negative terminal to TP4.

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TP4TP8

Metal Ground Barrel

Probe Tip

Test Setup

Figure 2. Tip and Barrel Measurement for Output Voltage Ripple

4.3.3 Channel 2 Output Voltage Monitoring (TP6 and TP7)

TPS53127EVM-614 provides two test points for measuring the voltage generated at the VO1 Output by the module. This allows the user to measure the actual output voltage without losses from output cables and connectors. All DC Output voltage measurements should be made between TP7 and TP6. To use TP7 and TP6, connect a voltmeter positive terminal to TP7 and negative terminal to TP6.

4.3.4 Soft-Start Voltage Monitoring (TP1, TP2 and TP3)

TPS53127EVM-614 provides two test points for measuring the soft-start ramp voltages. TP1 monitors the soft-start ramp of Channel 1. TP2 monitors the soft-start ramp of Channel 2. To use TP1 or TP2, connect an oscilloscope probe between TP1 or TP2 and TP3.

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4.3.5 Switching Node Monitoring (TP3, TP5 and TP11)

TPS53127EVM-614 provides two test points for measuring the switching node waveform voltages. TP5 monitors the switching node of Channel 1. TP2 monitors the switching node of Channel 2. To use TP5 or TP11, connect an oscilloscope probe between TP5 or TP11 and TP3.

4.3.6 5-V Regulator Output Monitoring (TP3 and TP10)

TPS53127EVM-614 provides a test point for measuring the output of the internal 5V regulator. TP10 monitors the output voltage of the internal 5V regulator. To use TP10, connect a voltmeter positive terminal to TP10 and negative terminal to TP3.

5 Test Setup

5.1 Equipment

5.1.1 Voltage Source

V The input voltage source (V minimum

5.1.2 Meters

A1: 0-4Adc, Ammeter V1: VIN, 0-22V voltmeter V2: VOUT1, 0-2V voltmeter V3: VOUT2, 0-2V voltmeter

) shall be a 0-25V variable DC source capable of supplying 3.0 Adc

VIN

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5.1.3 Loads

LOAD1: The Output Load shall be an Electronic Load set for Constant Current Mode capable of 0-4Adc at

1.05Vdc LOAD2: The Output Load shall be an Electronic Load set for Constant Current Mode capable of 0-4Adc at

1.80Vdc

5.1.4 Oscilloscope

Oscilloscope The Oscilloscope shall be an Analog or Digital Oscilloscope set for AC coupled measurement with 20MHz bandwidth Limiting. Use 20mV / division vertical resolution, 1.0µs / division horizontal resolution for Output Ripple Voltage Test. Set Cursors at +20mV and –20mV

Probe One Oscilloscope probes shall be Tektronix P6138 or equivalent oscilloscope probe with exposed conductive ground barrels.

5.1.5 Recommended Wire Gauge VINto J3 – The connection between the source voltage, VVIN and J1 of TPS53127EVM-614 can carry as

much as 2.0Adc. The minimum recommended wire size is AWG #16 with the total length of wire less than 2 feet (1 foot input, 1 foot return).

J1 to LOAD1 and J2 to LOAD2 – The connection between J1 and LOAD1 and J2 and LOAD2 of TPS53127EVM-614 can carry as much as 4Adc each. The minimum recommended wire size is AWG #14, with the total length of wire less than 2 feet (1 foot input, 1 foot return)

Test Setup

5.1.6 Other FAN – The TPS53127EVM-614 Evaluation Module includes components that can get hot to the touch.

Because this EVM is not enclosed to allow probing of circuit nodes, a small fan capable of 200-400 lfm is required to reduce component temperatures when operating

5.2 Equipment Setup

Shown in Figure 3 is the basic test set up recommended to evaluate the TPS53127EVM-614. Note that although the return for J3 and J1 and JP2 are the same system ground, the connections should remain separate as shown in Figure 3.

5.2.1 Procedure

1. Working at an ESD workstation, make sure that any wrist straps, bootstraps or mats are connected

referencing the user to earth ground before power is applied to the EVM. Electrostatic smock and safety glasses should also be worn.

2. Prior to connecting the DC input source, VIN, it is advisable to limit the source current from VINto 3.0A

maximum. Make sure VINis initially set to 0V and connected as shown in Figure 3.

3. Verify SW1 and SW2 are in the desired position.

4. Place a fan as shown in Figure 3 and turn on, making sure that air is flowing across the EVM.

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LOAD1

1.05V @ 4A

LOAD2

1.8V @ 4A

VIN

FAN

Test Setup

5.2.2 Diagram

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Figure 3. TPS53127EVM-614 Recommended Test Setup

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5.3 Start Up/Shut Down Procedure

Increase VINfrom 0V to 12Vdc Vary LOAD1 from 0 – 4Adc Vary LOAD2 from 0 – 4Adc Vary VINfrom 8Vdc to 22Vdc Decrease VINto 0Vdc Decrease LOAD1 to 0A Decrease LOAD2 to 0A

5.4 Output Ripple Voltage Measurement Procedure

Increase VINfrom 0V to 12Vdc Adjust LOAD1 to desired load between 0Adc and 4Adc Adjust LOAD2 to desired load between 0Adc and 4Adc Adjust VINto desired load between 8Vdc and 22Vdc Connect Oscilloscope Probe to CN1 or CN2 shown in Figure 3 Measure Output Ripple Decrease VINto 0Vdc Decrease LOAD1 to 0A Decrease LOAD2 to 0A

TPS53127EVM-614 Test Data

5.5 Equipment Shutdown

Shut Down Oscilloscope Shut down V

Shut down LOAD1 Shut down LOAD2 Shut down FAN

6 TPS53127EVM-614 Test Data

Figure 4 through Figure 11 present typical performance curves for the TPS53127EVM-614. Since 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.

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0 0.5 1 1.5 2 2.5 3 3.5 4

I - Load Current - A

LOAD

h - Efficiency - %

100

V = 8 V

V = 12 V

V = 22 V

V = 8 V-22 V, V = 1.05 V, I = 0 A-4 A

OUT1

0 0.5 1 1.5 2 2.5 3 3.5 4

I - Load Current - A

LOAD

h - Efficiency - %

100

V = 8 V

V = 12 V

V = 22 V

V = 8 V-22 V, V = 1.80 V, I = 0 A-4 A

OUT2

TPS53127EVM-614 Test Data

6.1 Efficiency

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Figure 4. Efficiency vs Load (VIN= 8 V–22 V, V

Figure 5. Efficiency vs Load (VIN= 8 V–22 V, V

= 1.05 V, I

OUT1

OUT2

= 1.8 V, I

OUT1

OUT2

- 0 A–4A)

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I - Load Current - A

LOAD

V - Output Voltage - V

1.036

1.038

1.04

1.042

1.044

1.046

1.048

1.05

1.052

1.054

0 1 2 3 4

V = 22 V

V = 8 V

V = 12 V

V = 8 V-22 V, V = 1.05 V, I = 0 A-4 A

OUT1

I - Load Current - A

LOAD

V - Output Voltage - V

1.795

1.8

1.805

1.81

1.815

1.82

1.825

1.83

0 0.5 1 1.5 2 2.5 3 3.5 4

V = 22 V

V = 8 V

V = 12 V

V = 8 V-22 V, V = 1.0 V, I = 0 A-4 A

OUT1

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6.2 Line and Load Regulation

TPS53127EVM-614 Test Data

Figure 6. Output Voltage vs Load (VIN= 8 V–22 V, V

Figure 7. Output Voltage vs Load (VIN= 8 V–22 V, V

OUT1

OUT2

= 1.05 V, I

= 0 A–4 A)

OUT1

= 0 A–4 A)

OUT2

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TPS53127EVM-614

Output Ripple

Test condition: 12 Vin, 105 V/4 A

TPS53127EVM-614

Output Ripple

Test condition: 12 Vin, 1.8 V/4 A

TPS53127EVM-614 Test Data

6.3 Output Voltage Ripple and Switching Node waveforms

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Figure 8. Output Voltage Ripple (VIN= 12 V, V

Figure 9. Output Voltage Ripple (VIN= 12 V, V

= 1.05 V, I

OUT1

OUT2

= 1.8 V, I

OUT1

OUT2

= 4 A)

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TPS53127EVM-614

SwitchNode

Test condition: 12 Vin, 1.05 V/4 A

TPS53127EVM-614

Switch Node

Test condition: 12 Vin, 1.8 V/4 A

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6.4 Switch Node

TPS53127EVM-614 Test Data

Figure 10. Switching Waveform (VIN= 12 V, V

Figure 11. Switching Waveform (VIN= 12 V, V

= 1.05 V, I

OUT1

OUT2

= 1.8 V, I

OUT1

OUT2

= 4 A)

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TPS53127EVM-614 EVM Assembly Drawings and Layout

7 TPS53127EVM-614 EVM Assembly Drawings and Layout

The following figures (Figure 12 through Figure 16) show the design of the TPS53127EVM-614 printed circuit board. The EVM has been designed using a 4-Layer, 2oz copper-clad circuit board 3.5 in 2.7 to allow the user to easily view, probe and evaluate the TPS53127 control IC in a practical application. Moving components to both sides of the PCB or using additional internal layers can offer additional size reduction for space constrained systems.

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Figure 12. Top Assembly

Figure 13. Bottom Assembly

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TPS53127EVM-614 EVM Assembly Drawings and Layout

Figure 14. Top Layer

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Figure 15. Bottom Layer

TPS53127EVM-614 EVM Assembly Drawings and Layout

Figure 16. Internal Layer 1

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Figure 17. Internal Layer 2

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8 Bill of Materials

Table 3 contains the Bill of Materials for TPS53127EVM-614. The reference designators reference the

Schematic in Figure 1 and Assembly locations in Figure 12. Components with a Quantity 0 listed are not populated on the PCB but are provided for reference.

Table 3. TPS53127EVM-614 Bill of Materials

Count RefDes Value Description Size Part Number MFR

0 C1 Capacitor, Aluminum, 25V, 20% 0.328 x 0.390 inch Std Std 0 C12, C19, C20, Capacitor, Ceramic 0603 Std Std

C21 1 C15 4.7 µF Capacitor,Ceramic, 10V, X5R, 20% 0805 Std Std 1 C16 1 µF Capacitor, Ceramic, 16V, X5R, 20% 0805 Std Std 4 C2, C3, C4, C5 10 µF Capacitor, Ceramic, 25V, X5R, 20% 1210 Std Std 2 C22, C23 4700pF Capacitor, Ceramic, Low Inductance, 16V, 0603 Std Std

0 C24, C25 Capacitor, Ceramic, 25V, X7R, 20% 0603 Std Std 2 C6, C11 0.1 µF Capacitor, Ceramic, 50V, X5R, 10% 0603 Std Std 6 C7, C9, C10, C14, 47 µF Capacitor, Ceramic, 6.3V, X5R, 20% 1206 Std Std

C17, C18 0 C8, C13 330 µF Capacitor, PXE, 4.0V, 15 milliohm, 20% 7343 (D) APXE4R0ARA331MF61G NIPPON

2 D1, D2 BAT54XV2T1G Diode, Schottky, 200 mA, 30 V SOD523 BAT54XV2T1G On Semi 3 J1, J2, J3 ED120/2DS Terminal Block, 2-pin, 15-A, 5.1mm 0.40 x 0.35 inch ED120/2DS OST 2 L1, L2 1.5 µH Inductor, SMT, 11A, 9.7 milliohm 0.256x 0.280 inch SPM6530T-1R5M100 TDK 4 Q1, Q2, Q3, Q4 CSD17507Q5A MOSFET,N-Chan, 30V, 65A, 11.8 milliohm QFN-8 POWER CSD17507Q5A TI 1 R1 1.62k Resistor, Chip, 1/16W, 1% 0603 Std Std 4 R10, R4, R6, R8 10.0k Resistor, Chip, 1/16W, 1% 0603 Std Std 2 R11, R12 5.11 Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R13 432 Resistor, Chip, 1/16W, 1% 0603 Std Std 0 R14, R15 Resistor, Chip, 1/8W, 5% 0603 Std Std 2 R17, R18 2.00 Resistor, Chip, 1/16W, 1% 0603 Std Std 0 R2, R7, R9 Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R3 3.32k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R5 12.1k Resistor, Chip, 1/16W, 1% 0603 Std Std 2 SW1, SW2 G12AP-RO Switch, ON-ON Mini Toggle 0.28 x 0.18"" G12AP-RO Nikkai 0 SW3 G12AP-RO Switch, ON-ON Mini Toggle 0.28 x 0.18"" G12AP-RO Nikkai 4 TP1, TP2, TP5, 5012 Test Point, White, Thru Hole 0.125 x 0.125 inch 5012 Keystone

TP11 1 TP10 5013 Test Point, Orange, Thru Hole 0.125 x 0.125 inch 5013 Keystone 3 TP3, TP4, TP6 5011 Test Point, Black, Thru Hole 0.125 x 0.125 inch 5011 Keystone 2 TP7, TP8 5014 Test Point, Yellow, Thru Hole 0.125 x 0.125 inch 5014 Keystone 1 TP9 5010 Test Point, Red, Thru Hole 0.125 x 0.125 inch 5010 Keystone 1 U1 TPS53127PW IC, Dual Synchronous Step-Down Controller TSSOP TPS53127PW TI

1 – PCB, 2.70" x 3.50" x 0.063" FR-4 2.7" x 3.5" HPA614 Any

Notes: 1. These assemblies are ESD sensitive, ESD precautions shall be observed.

2. These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.

3. These assemblies must comply with workmanship standards IPC-A-610 Class 2.

4. Ref designators marked with an asterisk ('**') cannot be substituted. All other components can be substituted with equivalent MFG's components.

X7R, 20%

For Low-Voltage Power Rails

Bill of Materials

CHEMI-CON

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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

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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

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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.

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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

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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 8.0 V to 22V and the output voltage range of 1.03 V to 1.90 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 40° C. The EVM is designed to

operate properly with certain components above 40° 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

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Texas Instruments TPS53127EVM-614 User Manual

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User Manual