Texas instruments TPS54310EVM User Manual
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TPS54310EVM
User’s Guide
February 2002 PMP EVMs
SLLU037
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty . Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty . Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. T o minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third–party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party , or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
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is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2002, Texas Instruments Incorporated
EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EV ALUA TION
PURPOSES ONL Y and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the 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 ST ATUT ORY, INCLUDING ANY W ARRANTY 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. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). 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 P ARTY 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 EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
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.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2002, Texas Instruments Incorporated
EVM WARNINGS AND RESTRICTIONS
This EVM is designed to operate over an input voltage range of 4.0 V to 6.0 V , and over a load
range of 0 A to 3 A.
It is important to operate this EVM within the specified input and output ranges described in
the EVM User’s Guide.
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 2002, Texas Instruments Incorporated
Contents
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Background 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Performance Specification Summary 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Modifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.1 General 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2 Switching Frequency 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.3 Output Voltage 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.4 Slow Start 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.5 Improving Transient Response 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Test Setup and Results 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Input/Output Connections 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Loop Characterization Setup 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Efficiency 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Thermal Performance 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Output Voltage Regulation 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 Load Transients 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 Loop Characteristics 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8 Output Voltage Ripple 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9 Input Ripple Voltage 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10 Start-Up 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Board Layout 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Layout 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Schematic and Bill of Materials 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Schematic 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Bill of Materials 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v
Contents
Figures
1–1 Frequency Trimming Resistor Selection Graph 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Connection Diagram 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Measured Efficiency 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 Measured Board Losses 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
°
2–4 Measured Junction Temperature at 25
2–5 Measured Load Regulation 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–6 Measured Load Transient Response 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–7 Improved Load Transient Response 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–8 Improved Loop Gain and Phase 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–9 Measured Loop Gain and Phase for Alternate Compensation 2-7. . . . . . . . . . . . . . . . . . . . . . .
2–10 Measured Output Voltage Ripple 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–11 Measured Input Voltage Ripple 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–12 Measured Start-Up Waveforms 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 Top Side Assembly 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–2 Bottom Side Assembly 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–3 Top Side Layout 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–4 Bottom Side Layout 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–1 TPS54310 EVM Schematic 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C Ambient 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
1–1 Performance Specification Summary 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–2 Output Voltage Programming 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–3 Alternate Compensation for Improved Transient Response 1-5. . . . . . . . . . . . . . . . . . . . . . . . .
4–1 TPS54310 EVM BIll of Materials 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vi
Chapter 1
Introduction
This chapter contains background information for the TPS54310 and support
documentation for the TPS54310 evaluation module. The EVM performance
specifications are also given.
Topic Page
1.1 Background 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Performance Specification Summary 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Modifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
Background
1.1 Background
The TPS54310 evaluation module (EVM) uses the TPS54310 synchronous
buck regulator to provide a 3.3-V output over an input range of 4.0 V to 6.0 V ,
and over a load range of 0 A to 3 A. Less than 0.55 square inches of board
space is occupied by the electrical components of the TPS54310 circuit.
Additional pads support multiple input and ouput capacitors. A jumper allows
the switching frequency to be easily changed from 350 kHz to 550 kHz.
The MOSFETs of the TPS54310 are incorporated inside the TPS54310
package. This eliminates the need for external MOSFET s and their associated
drivers. The low drain-to-source on resistance of the MOSFETs gives the
TPS54310 high efficiency and helps to keep the junction temperature low at
high output currents. The compensation components, external to the IC, allow
for an adjustable output voltage and a customizable loop reponse.
1.2 Performance Specification Summary
Table 1–1 provides a summary of the TPS54310 EVM performance
specifications. All specifications are given for an ambient temperature of 25°C,
unless otherwise noted.
Table 1–1.Performance Specification Summary
Specification Test Conditions Min Typ Max Units
Input voltage range 4.0 5.0 6.0 V
Output voltage set point 3.3 V
Output current range VIN = 5 V 0 3 A
Load regulation VIN = 5 V –7 7 mV
–95 mV
IO = 0 A to 3 A
Load transient response
Loop bandwidth VIN = 5 V, IO = 3 A 30 kHz
Phase margin VIN = 5 V, IO = 3 A 95 _
Input ripple voltage 120 200 mV
Output ripple voltage 30 50 mV
Output rise time 2.6 3.6 4.1 ms
Operating frequency 640 700 760 kHz
p
IO = 3 A to 0 A
†
30
75 mV
†
25
µs
µs
PK
PK
PP
PP
Efficiency VIN = 5 V, IO = 1 A 93% –
†
Transient response time is defined as the time elapsed from the onset of the transient to the time that the output returns within
±2% of its steady state value.
1-2
1.3 Modifications
1.3.1 General
The TPS54310 EVM is designed to demonstrate the small amount of board
space taken up by the TPS54310 electrical components. In addition, the EVM
can be used to evaluate different output filters by substituting an alternate
inductor for L1, or by using the optional pads for capacitors C2 and C1 1 (see
Figure 3–1). When changing the output filter, the compensation values must
also be changed to ensure that stability is maintained. The SWIFT Designer
software tool or Texas Instruments application note SL VA109 can be used to
assist in the calculation of compensation components. Both SWIFT Designer
and SLVA109 are available for download at the Texas Instruments web site.
1.3.2 Switching Frequency
The TPS54310 is configured to switch at a frequency of 700 kHz. Alternatively ,
the EVM can be easily configured to switch at either 350 kHz or 550 kHz by
removing the frequency trimming resistor R3, and placing the shunt on jumper
JP1 in the proper location. Also, by changing the value of RT (R3), the switch-
ing frequency can be trimmed to any value between 280 kHz and 700 kHz. A
plot of the value of RT versus the switching frequency is given in Figure 1–1.
Performance Specification Summary
Figure 1–1.Frequency Trimming Resistor Selection Graph
750
700
650
600
550
500
450
400
Switching Frequency – kHz
350
300
250
60 70 80 90 100 110 120 130 140 150 160 170 180
R – Resistance – kΩ
Introduction
1-3
Performance Specification Summary
1.3.3 Output Voltage
The output voltage of the TPS54310 EVM can be adjusted to any value down
to 0.9 V by changing only one component value (R4). The value of R4 for a
specific output voltage can be calculated by using equation 1–1. Table 1–2
lists the value of R4 for some common bus voltages.
R4+ 10 kW
Table 1–2.Output Voltage Programming
Output Voltage
(V)
0.9 1000
1.2 28.7
1.5 14.7
1.8 9.76
2.5 5.49
3.3 3.74
1.3.4 Slow Start
The slow start time of the EVM can be modified by changing the value of C1.
Use equation 1–2 to calculate the value of C1 for a specific slow start time. With
C1 open, the slow start time is typically 3.6 ms. The slow start time can not be
made faster than 3.6 ms.
0.891 V
VO–0.891 V
(1–1)
R4
(kΩ)
TSS 5 mA
C
+
1
0.891 V
1.3.5 Improving Transient Response
The feedback compensation components are R2, R4, R5, R6, C4, C5, and C6
(see Figure 4–1), and were selected based on the output of the SWIFT
Designer software tool. This results in a unity gain bandwidth of 30 kHz, and
a phase margin of 95° (see Figure 2–8). The TPS54310 EVM responds to a
3-A load transient within 30 µs using the compensation shown in the
schematic. While this response time is more than sufficient for most
applications, the response time can be made faster by changing the values of
the feedback compensation components. Using the values given by
Table 1–3, the unity gain bandwidth is increased to 75 kHz, and the phase
margin is 72° (see Figure 2–9). With this alternate compensation, the output
voltage remains within a ±2% regulation band during a 3-A load transient (see
Figure 2–7).
(1–2)
1-4
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