Texas Instruments TPS54240EVM-VSON User manual

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TPS54240EVM-VSON Regulator Evaluation Module
User's Guide
SNVU602–May 2019
TPS54240EVM-VSON Regulator Evaluation Module
This user's guide contains information for the TPS54240EVM-VSON evaluation module. Included are the
performance specifications, the schematic, and the bill of materials for the TPS54240EVM-VSON.
Contents
1 Introduction ................................................................................................................... 3
2 Test Setup and Results..................................................................................................... 4
3 Schematic and Bill of Materials........................................................................................... 13
4 Board Layout................................................................................................................ 15
5 Modifications................................................................................................................ 19
List of Figures
1 Top View of TPS54240EVM-VSON....................................................................................... 5
2 TPS54240EVM-VSON Efficiency.......................................................................................... 6
3 TPS54240EVM-VSON Low Current Efficiency .......................................................................... 6
4 TPS54240EVM-VSON Load Regulation.................................................................................. 7
5 TPS54240EVM-VSON Transient Response ............................................................................ 8
6 TPS54240EVM-VSON Output Voltage Ripple in CCM Mode at 2.5-A ILOAD ......................................... 9
7 TPS54240EVM-VSON Output Voltage Ripple in DCM Mode at 200-mA ILOAD ...................................... 9
8 TPS54240EVM-VSON Output Voltage Ripple in Eco-mode™ at 20-mA ILOAD....................................... 9
9 TPS54240EVM-VSON Input Voltage Ripple in CCM mode at 2.5-A ILOAD .......................................... 10
10 TPS54240EVM-VSON Input Voltage Ripple in DCM Mode at 200 mA ILOAD ....................................... 10
11 TPS54240EVM-VSON Input Voltage Ripple in Eco-mode™ at 20 mA ILOAD ....................................... 10
12 TPS54240EVM-VSON Start-Up ......................................................................................... 11
13 TPS54240EVM-VSON Power-Good Output (pulled up to VOUT)..................................................... 11
14 TPS54240EVM-VSON Power-Good Output (Pulled up to external 3.3 V) ......................................... 11
15 TPS54240EVM-VSON Loop Response ................................................................................ 12
16 TPS54240EVM-VSON Schematic ....................................................................................... 13
17 TPS54240EVM-VSON Top-Side Assembly ............................................................................ 15
18 TPS54240EVM-VSON Bottom-Side Assembly ........................................................................ 16
19 TPS54240EVM-VSON Top-Side Layout................................................................................ 16
20 TPS54240EVM-VSON Mid-Layer 1 Layout............................................................................. 17
21 TPS54240EVM-VSON Mid-Layer 2 Layout............................................................................. 17
22 TPS54240EVM-VSON Bottom-Side Layout............................................................................ 18
List of Tables
1 Input Voltage and Output Current Summary............................................................................. 3
2 TPS54240EVM-VSON Performance Specification Summary ......................................................... 4
3 EVM Connectors and Test Points ......................................................................................... 5
4 Bill of Materials ............................................................................................................ 14
5 Output Voltages Available................................................................................................. 19

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Trademarks
Eco-mode is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.

www.ti.com Introduction
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TPS54240EVM-VSON Regulator Evaluation Module
1 Introduction
This user's guide contains background information for the TPS54240 as well as support documentation for
the TPS54240EVM-VSON evaluation module, which is for the VSON package. Also included are the
performance specifications, the schematic, and the bill of materials for the TPS54240EVM-VSON.
1.1 Background
The TPS54240 DC/DC converter is designed to provide up to a 2.5-A output from an input voltage source
of 3.5 V to 42 V. Rated input voltage and output current range for the evaluation module are given in
Table 1. This evaluation module is designed for VSON package. The switching frequency is internally set
at a nominal 500 kHz. The high-side MOSFET is incorporated inside the TPS54240 package along with
the gate-drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS54240 to
achieve high efficiencies and helps keep the junction temperature low at high output currents. The
compensation components are external to the integrated circuit (IC), and an external divider allows for an
adjustable output voltage. Additionally, the TPS54240 provides adjustable slow start and undervoltage
lockout inputs. The absolute maximum input voltage is 42 V for the TPS54240EVM-VSON.
Table 1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE
TPS54240EVM-VSON VIN = 7 V to 24 V 0 A to 2.5 A
Note that EN has an absolute maximum rating of 5 V input and a 1.25-V typical
threshold voltage, the selection of R1and R4limits input voltage range between
7 V and 24 V.
1.2 Performance Specification Summary
A summary of the TPS54240EVM-VSON performance specifications is provided in Table 2. Specifications
are given for an input voltage of VIN = 12 V and an output voltage of 3.3 V, unless otherwise specified. The
TPS54240EVM-VSON is designed and tested for VIN = 7 V to 24 V. The ambient temperature is 25°C for
all measurements, unless otherwise noted. The EVM may be modified by the user to operate from input
voltages up to the 42 V operating limit of the TPS54240.
CAUTION
Risk of electric shock for voltages exceeding 50 VDC.

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Table 2. TPS54240EVM-VSON Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
VIN voltage range 7 12 24 V
Output voltage set point 3.3 V
Output current range VIN = 10 V to 20 V 0 2.5 A
Load regulation VIN = 12 V, IOUT = 0.001 A to 2.5 A ±0.06%
Load transient response IOUT = 0.5 A to 2.5 A Voltage change –30 mV
Recovery time 1 ms
IOUT = 2.5 A to 0.5 A Voltage change 40 mV
Recovery time 1 ms
Loop bandwidth VIN = 12 V, IOUT = 2.5 A 36.9 kHz
Phase margin VIN = 12 V , IOUT =2.5 A 64 °
Input ripple voltage IOUT = 2.5 A 320 mVpp
Output ripple voltage IOUT= 2.5 A 20 mVpp
Slow start time 3 ms
Operating frequency 500 kHz
Peak efficiency TPS54240EVM-VSON, VIN = 12 V, IOUT = 0.7 A 87.7%
CCM/DCM boundary VIN = 12 V 0.4 A
Eco-mode™ threshold VIN = 12 V 45 mA
2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54240EVM-VSON evaluation
module. The section also includes test results typical for the evaluation module and covers efficiency,
output voltage regulation, load transients, loop response, output ripple, input ripple, and start-up.
2.1 Input/Output Connections
The TPS54240EVM-VSON is provided with input/output connectors and test points as shown in Table 3.
See Figure 1 for the location of the connectors. A power supply capable of supplying 2.5 A must be
connected to J1 and J3 through a pair of 20 AWG wires. The load must be connected to J2 and J3
through a pair of 20 AWG wires. The maximum load current capability must be 2.5 A. Wire lengths must
be minimized to reduce losses in the wires. Test-point TP1 provides a place to monitor the VIN input
voltages with TP3 providing a convenient ground reference. TP2 is used to monitor the output voltage with
TP4 as the ground reference.

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Figure 1. Top View of TPS54240EVM-VSON
Table 3. EVM Connectors and Test Points
REFERENCE DESIGNATOR FUNCTION
J1 VIN (see Table 1 for VIN range)
J2 VOUT, 3.3 V at 2.5 A maximum
J3 Input and output GND
TP1 VIN test point at VIN connector
TP2 Output voltage test point at OUT connector
TP5 Test point between voltage divider network and output. Used for loop response measurements.
TP6 EN test point. Connect EN to ground to disable, open to enable.
TP7 Slow start monitor test point
TP8 RT test point.
TP11 PWRGD test point
TP12 PH test point
TP3,TP4,TP9,TP10 GND test point

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2.2 Efficiency
The efficiency of this EVM peaks at a load current of about 0.7 A with VIN = 12 V, 18 V, and 24 V. And
then decreases as the load current increases towards full load. Figure 2 shows the efficiency for the
TPS54240EVM-VSON at an ambient temperature of 25°C.
Figure 2. TPS54240EVM-VSON Efficiency
Figure 3 shows the efficiency for the TPS54240EVM-VSON at lower output currents between 0.001 A and
0.5 A at an ambient temperature of 25°C.
Figure 3. TPS54240EVM-VSON Low Current Efficiency
The efficiency may be lower at higher ambient temperatures, due to temperature variation in the drain-to-
source resistance of the internal MOSFET.

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2.3 Output Voltage Load Regulation
The load regulation for the TPS54240EVM-VSON is shown in Figure 4.
Figure 4. TPS54240EVM-VSON Load Regulation
Measurements are given for an ambient temperature of 25°C.

Time = 2msec / div
Output Current = 1 A / div (Load Step 0.5 A to 2.5 A)
Vout = 20 mV / div (ac coupled)
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2.4 Load Transients
The TPS54240EVM-VSON response to load transients is shown in Figure 5. The current step is from 0.5
A to 2.5 A . The input voltage is 12 V. Total peak-to-peak voltage variation is as shown, including ripple
and noise on the output.
Figure 5. TPS54240EVM-VSON Transient Response

Time = 50usec / div
Inductance Current = 500 mA / div
PH = 10 V / div
Vout = 20 mV / div (ac coupled)
Time = 2usec / div
Inductance Current = 1 A / div
PH = 10 V / div
Vout = 20 mV / div (ac coupled)
Time = 2usec / div
Inductance Current = 500 mA / div
PH = 10 V / div
Vout = 20 mV / div (ac coupled)
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2.5 Output Voltage Ripple
The output current is the rated full load of 2.5 A and VIN = 12 V. The ripple voltage is measured directly
across the output capacitors.
When the output current is greater than one half the peak-to-peak inductor current, the circuit is operating
in continuous conduction mode (CCM).The TPS54240EVM-VSON output voltage ripple in CCM mode is
shown in Figure 6. The ripple voltage is measured directly across the input capacitors.
When the output current is less than one half the peak to peak inductor current, the circuit is operating in
discontinuous conduction mode (DCM). The circuit enters DCM when the nominal output current falls
below 400 mA. The TPS54240EVM-VSON output voltage ripple in DCM mode is shown in Figure 7
At light load currents, the TPS54240 is designed to operate in the pulse-skipping Eco-mode™ operation.
When the nominal output current falls below 45 mA. typical, the device enters the Eco-mode™ operation.
The TPS54240EVM-VSON output voltage ripple in Eco-mode is shown in Figure 8.
Figure 6. TPS54240EVM-VSON Output Voltage Ripple in
CCM Mode at 2.5-A ILOAD
Figure 7. TPS54240EVM-VSON Output Voltage Ripple in
DCM Mode at 200-mA ILOAD
Figure 8. TPS54240EVM-VSON Output Voltage Ripple in Eco-mode™ at 20-mA ILOAD

Time = 20usec / div
PH = 10 V / div
Vout = 20 mV / div (ac coupled)
Time = 1usec / div
PH = 10 V / div
Vout = 20 mV / div (ac coupled)
Time = 1usec / div
PH = 10 V / div
Vout = 200 mV / div (ac coupled)
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2.6 Input Voltage Ripple
The TPS54240EVM-VSON input voltage ripple in CCM mode is shown in Figure 9. The output current is
the rated full load of 2.5 A and VIN = 12 V. The ripple voltage is measured directly across the input
capacitors. The TPS54240EVM-VSON input voltage ripple in DCM mode is shown in Figure 10. The
output current is 200 mA. The TPS54240EVM-VSON input voltage ripple in Eco-mode is shown in
Figure 11. The output current is 20 mA.
Figure 9. TPS54240EVM-VSON Input Voltage Ripple in
CCM mode at 2.5-A ILOAD
Figure 10. TPS54240EVM-VSON Input Voltage Ripple in
DCM Mode at 200 mA ILOAD
Figure 11. TPS54240EVM-VSON Input Voltage Ripple in Eco-mode™ at 20 mA ILOAD

Time = 5msec / div
EN = 2 V / div
Vin = 10 V / div
Vout = 2 V / div
Power Good = 5 V / div
Time = 5msec / div
EN = 2 V / div
Vin = 10 V / div
Vout = 2 V / div
Power Good = 5 V / div
Time = 5msec / div
EN = 2 V / div
Vin = 10 V / div
Vout = 2 V / div
Soft Start = 2 V / div
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2.7 Powering Up
The start-up waveforms are shown in Figure 12. Start-up is relative to VIN rising. The input voltage is
initially applied, and when the input reaches the undervoltage lockout threshold, the start-up sequence
begins, and the output ramps up at the externally set rate toward the set value of 3.3 V.
Figure 12. TPS54240EVM-VSON Start-Up
2.8 Power Good Output
The power-good (PWRGD) pin can be pull up by a 10-kΩresistor to VOUT or an external voltage source.
When connected to VOUT, the power good output waveforms are shown in Figure 13. When connected to
an external 3.3 V, the power-good output waveforms are shown in Figure 14.
Figure 13. TPS54240EVM-VSON Power-Good Output
(pulled up to VOUT)Figure 14. TPS54240EVM-VSON Power-Good Output
(Pulled up to external 3.3 V)

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2.9 Loop Characteristics
The TPS54240EVM-VSON loop-response characteristics are shown in Figure 15 . Gain and phase plots
are shown for VIN voltage of 12V. Load current for the measurement is 2.5 A.
Figure 15. TPS54240EVM-VSON Loop Response

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3 Schematic and Bill of Materials
This section presents the TPS54240EVM-VSON schematic and bill of materials.
3.1 Schematic
Figure 16 is the schematic for the TPS54240EVM-VSON.
Figure 16. TPS54240EVM-VSON Schematic

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3.2 Bill of Materials
Table 4 presents the bill of materials for the TPS54240EVM-VSON.
Table 4. Bill of Materials
Qty Designator Value Description Package PartNumber Manufacturer
2 C1, C2 2.2uF CAP, CERM, 2.2 uF, 100 V, +/-
10%, X5R, 1210 Std Std
1 C11 0.01uF CAP, CERM, 0.01 uF, 25 V, +/-
10%, X7R, 0603 0603 Std Std
0 C12 10pF CAP, CERM, 10 pF, 50 V, +/- 5%,
C0G/NP0, 0603 0603 Std Std
1 C13 3300pF CAP, CERM, 3300 pF, 50 V, +/-
10%, X7R, 0603 0603 Std Std
0 C14 68uF CAP, AL, 68 uF, 63 V, +/- 20%,
SMD JA0 Std Std
3 C3, C5, C10 1uF CAP, CERM, 1 uF, 25 V, +/- 10%,
X7R, 0805 0805 Std Std
1 C4 0.1uF CAP, CERM, 0.1 uF, 10 V, +/- 10%,
X7R, 0603 0603 Std Std
2 C6, C7 47uF CAP, CERM, 47 uF, 10 V, +/- 20%,
X5R, 1210 1210 Std Std
0 C8, C9 47uF CAP, CERM, 47 uF, 10 V, +/- 20%,
X5R, 1210 1210 Std Std
1 D1 40V Diode, Schottky, 40 V, 3 A, SMB SMB B340B-13-F Diodes Inc.
3 J1, J2, J3 Standard Banana Jack, Uninsulated,
8.9mm Keystone575-8 575-8 Keystone
1 J4 Header, 100mil, 3x1, Gold, TH Header, 100mil,
3x1, TH HTSW-103-07- G-S Samtec
1 L1 10uH Inductor, Shielded Drum Core,
Ferrite, 10 uH, 4.09 A, 0.021 ohm,
SMD
SMD 74477110 Wurth Elektronik
1 R1 124k RES, 124 k, 1%, 0.1 W, AEC-Q200
Grade 0, 0603 0603 Std Std
1 R2 51 RES, 51, 0.1%, 0.1 W, 0603 0603 Std Std
1 R3 31.6k RES, 31.6 k, 1%, 0.1 W, AEC-Q200
Grade 0, 0603 0603 Std Std
1 R4 30.1k RES, 30.1 k, 1%, 0.1 W, AEC-Q200
Grade 0, 0603 0603 Std Std
1 R5 237k RES, 237 k, 1%, 0.1 W, AEC-Q200
Grade 0, 0603 0603 Std Std
2 R6, R8 10.0k RES, 10.0 k, 1%, 0.1 W, 0603 0603 Std Std
1 R7 16.5k RES, 16.5 k, 1%, 0.1 W, AEC-Q200
Grade 0, 0603 0603 Std Std
7 TP1, TP2, TP5,
TP6, TP7, TP8,
TP12
Test Point, Multipurpose, Red, TH Red
Multipurpose
Testpoint
5010 Keystone
5 TP3, TP4, TP9,
TP10, TP11 Test Point, Multipurpose, Black, TH Black Multipurpose
Testpoint
5011 Keystone
1 U1 3.5V to 42V Input, 2.5A Step-Down
Converter with Eco-Mode,
DRC0010J (VSON-10)
DRC0010J TPS54240DRC
RTexas Instruments

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4 Board Layout
This section provides a description of the TPS54240EVM-VSON, board layout, and layer illustrations.
4.1 Layout
The board layout for the TPS54240EVM-VSON is shown in Figure 17 through Figure 18. The EVM offers
resistors, capacitors and test points to configure the output voltage, enable (EN) pin, set frequency, and
external clock synchronization.
The VSON package offers an exposed thermal pad, which must be soldered to the copper landing on the
PCB for optimal thermal performance. The PCB consists of a 4-layer design. There are 2-oz copper
planes on the top and bottom and 1-oz copper mid-layer planes to dissipate heat with an array of thermal
vias under the thermal pad to connect to all four layers.
Test points have been provided for ease of use to connect the power supply, required load and to monitor
critical signals. The 12-pin edge connector can also be used to facilitate the use of a cable harness if one
is required.
Figure 17. TPS54240EVM-VSON Top-Side Assembly

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Figure 18. TPS54240EVM-VSON Bottom-Side Assembly
Figure 19. TPS54240EVM-VSON Top-Side Layout

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Figure 20. TPS54240EVM-VSON Mid-Layer 1 Layout
Figure 21. TPS54240EVM-VSON Mid-Layer 2 Layout

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Figure 22. TPS54240EVM-VSON Bottom-Side Layout
4.2 Estimated Circuit Area
The estimated printed-circuit board area for the components used in this design is about 1.5 in2. This area
does not include test points or connectors.

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5 Modifications
These evaluation modules are designed to provide access to the features of the TPS54240. Some
modifications can be made to this module.
5.1 Output Voltage Setpoint
The voltage divider of R3and R6is used to set the output voltage of the EVM. The 51-Ωresistor R2is
provided as an aid to check the loop response of the circuit. To change the output voltage of the EVM, it is
necessary to change the value of resistor R3. Changing the value of R3can change the output voltage
above 0.8 V or 90% VIN. The value of R3for a specific output voltage can be calculated using Equation 1.
(1)
Table 5 lists the R3values for some common output voltages. Note that VIN must be in a range so that the
minimum on-time is greater than 130 ns, and the maximum duty cycle is less than 90%. Higher duty
cycles are possible, but may result in uneven switching behavior. The values given in Table 5 are
standard values, not the exact value calculated using Equation 1.
Table 5. Output Voltages Available
OUTPUT
VOLTAGE
(V)
R3VALUE
(kΩ)
1.8 12.4
2.5 21.5
3.3 31.6
5 52.3
Be aware that changing the output voltage can affect the loop response. It may be necessary to modify
the compensation components. Also, changing output voltage may need to change LOUT and COUT as well.
Check COUT voltage rating if higher VOUT is used. See the device data sheet for details.
5.2 Operating Frequency, Soft Start, and UVLO
The operating frequency, soft-start time, and UVLO voltage may also be adjusted. R5sets the operating
frequency, C11 sets the soft-start time and the resistor divider of R1and R2sets the UVLO start and stop
voltages. See the TPS54240 device data sheet for details on adjusting these parameters.

STANDARD TERMS FOR EVALUATION MODULES
1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or
documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance
with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License
Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by
neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have
been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications
or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control
techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.
User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)
business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.
2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit
User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty
period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or
replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be
warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
WARNING
Evaluation Kits are intended solely for use by technically qualified,
professional electronics experts who are familiar with the dangers
and application risks associated with handling electrical mechanical
components, systems, and subsystems.
User shall operate the Evaluation Kit within TI’s recommended
guidelines and any applicable legal or environmental requirements
as well as reasonable and customary safeguards. Failure to set up
and/or operate the Evaluation Kit within TI’s recommended
guidelines may result in personal injury or death or property
damage. Proper set up entails following TI’s instructions for
electrical ratings of interface circuits such as input, output and
electrical loads.
NOTE:
EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION
KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.