TPS63020EVM-487 [TI]
Input voltage: Iout = 1000 mA; 输入电压： IOUT =千毫安
| 型号： | TPS63020EVM-487 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Input voltage: Iout = 1000 mA |
| 文件： | 总10页 (文件大小：424K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
User's Guide
SLVU365–March 2010
TPS63020EVM-487
This user’s guide describes the characteristics, operation, and use of the TPS63020EVM evaluation
module (EVM). The EVM is designed to help the user easily evaluate and test the operation and
functionality of the TPS63020. This user’s guide includes setup instructions for the hardware, a schematic
diagram, a bill of materials, and printed-circuit board layout drawings for the evaluation module.
Contents
1
2
3
4
Introduction .................................................................................................................. 1
Setup and Results .......................................................................................................... 2
Board Layout ................................................................................................................ 5
Schematic and Bill of Materials ........................................................................................... 7
List of Figures
1
2
3
4
5
6
7
8
9
Turn ON Into Electronic Load .............................................................................................
Output Ripple Vin 3 V ......................................................................................................
Output Ripple Vin 4 V ......................................................................................................
Efficiency Over Li-Ion Cell Range ........................................................................................
Load Step 100 mA to 500 mA.............................................................................................
Assembly Layer .............................................................................................................
Top Layer Routing ..........................................................................................................
Bottom Layer Routing ......................................................................................................
Schematic....................................................................................................................
3
4
4
5
5
6
6
7
7
List of Tables
1
2
Performance Specification Summary.....................................................................................
TPS63020EVM-487 Bill of Materials .....................................................................................
2
8
1
Introduction
The Texas Instruments TPS63020 is a highly efficient, single-inductor, buck-boost converter in a 14-pin,
3-mm × 4-mm QFN package. Both fixed and adjustable output voltage units are available.
1.1 Background
The TPS63020EVM-487 uses the TPS63020 adjustable version and is set to 3.3-V output. The EVM
operates with full-rated performance with an input voltage between 1.8 V and 5.5 V.
1.2 Performance Specification
Table 1 provides a summary of the TPS63020EVM-487 performance specifications. All specifications are
given for an ambient temperature of 25°C.
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Setup and Results
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Table 1. Performance Specification Summary
Specification
Input voltage
Output voltage
Output current
Test Conditions
Iout = 1000 mA
Iout = 0 mA to 1000 mA
3.6 V in
Min
2.0
3.2
0
Typ
3.6
Max
5.5
Unit
V
3.3
3.4
V
1000
2400
90%
25
2500
mA
kHz
Operating frequency
Efficiency
3.6 V in at 1000-mA load
3.6 V in at 500-mA load
Output ripple
mV
1.3 Modifications
The printed-circuit board (PCB) for this EVM is designed to accommodate both the fixed and adjustable
versions of this integrated circuit (IC). If the fixed version is installed, R1 is replaced with a 0-Ω resistor
and R2 is open. Extra positions are available for additional input and output capacitors.
1.3.1
Adjustable Output IC U1 Operation
U1 is configured for evaluation of the adjustable output version. This unit is set to 3.3 V. Resistors R1 and
R2 are used to set the output voltage between 1.2 V and 5.5 V. See the data sheet for recommended
values.
1.3.2
2
Fixed Output Operation
U1 can be replaced with the fixed version for evaluation. With the fixed version, R1 needs to be replaced
with a 0-Ω resistor; R2 position is open.
Setup and Results
This section describes how to properly use the TPS63020EVM-487.
2.1 Input/Output Connector and Header Descriptions
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
J1 – VIN
Positive input connection from the input supply for U1.
J2 – Sense
Vin Sense and GND Sense, low current sense lines for sampling input voltage at input capacitor.
J3 – GND
Vin GND return connection from the input supply for U1, common with J6.
J4 – VOUT
Output voltage connection.
J5 – Sense
Vout Sense and GND Sense low current sense lines for sampling output voltage at output capacitor.
J6 – GND
Vout GND return connection for output voltage, common with J3.
2.1.7
J7 – PG GND
Power Good (PG) test point and GND connection.
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Setup and Results
2.1.8
JP1 – ENABLE
Shorting jumper between the center pin and ON turns on the unit. Installing a shorting jumper between the
center pin and OFF turns the unit off.
2.1.9
JP2 –PWR Save
Installing a shorting jumper between the center pin and OFF disables power-saving mode; jumper
between center pin and ON enables power-saving mode. The center pin can be used to synchronize the
unit with an external clock; see data sheet for additional details.
2.2 Setup
To operate the EVM, connect an input supply to the appropriate pins, and connect a load to the
appropriate pins.
2.3 Power-Up
The soft-start circuit is controlled by a ramp to the current limit comparator that starts the switch current
limit low and increases to maximum value. Output voltage is monitored during this time and must increase
for switch current to increase.
EN Pin
VOUT 1 V/div
Figure 1. Turn ON Into Electronic Load
2.4 Output Ripple
Output ripple occurs at the switching frequency of 2.4 MHz, and with the recommended L and output C, is
low. Amplitude of the ripple varies, depending on load current and input voltage. Ensure that the
oscilloscope probe is connected as close as possible to the output capacitor, with a short ground lead, for
accurate measurements. Resistance in trace and leads adds to output ripple, and ground lead length
increases the amplitude of switching spikes.
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Setup and Results
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VOUT 10 mV/div
L2 Pin
L1 Pin
Figure 2. Output Ripple Vin 3 V
VOUT 10 mV/div
L2 Pin
L1 Pin
Figure 3. Output Ripple Vin 4 V
2.5 Efficiency
Efficiency of over 90% is common at mid-to-high loads. With power-save mode enabled, efficiency is
greater than 80% at light loads of 1 mA to 100 mA.
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Board Layout
100
95
90
85
80
75
70
65
5 V
2.5 V
3.6 V
4.2 V
3 V
60
55
50
TPS6300,
PS = Low,
V
= 3.3 V
O
0
0.5
1
1.5 2
- Output Current - A
2.5
3
3.5
I
O
Figure 4. Efficiency Over Li-Ion Cell Range
2.6 Power Dissipation
With high efficiency, the power to be dissipated is low. Also, the QFN package with a solder pad is very
efficient at removing heat. Care must be taken, however, to not overheat the device.
2.7 Load Transients
Load transient response is well regulated. Additional output capacitance reduces voltage overshoot and
undershoot.
VOUT 100 mV/div
LOAD PULSE
Figure 5. Load Step 100 mA to 500 mA
3
Board Layout
This section provides the TPS63020EVM-487 board layout and illustrations.
3.1 Layout
Figure 6 through Figure 8 show the board layout for the TPS63020EVM-487 PCB.
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Board Layout
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Figure 6. Assembly Layer
Figure 7. Top Layer Routing
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Schematic and Bill of Materials
Figure 8. Bottom Layer Routing
4
Schematic and Bill of Materials
This section provides the TPS63020EVM-487 schematic and bill of materials.
4.1 Schematic
+
Figure 9. Schematic
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Schematic and Bill of Materials
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4.2 Bill of Materials
Table 2. TPS63020EVM-487 Bill of Materials
Count RefDes
Value
Description
Size
Part Number
MFR
2
5
1
1
1
C1, C4
2.2 mF
Capacitor, ceramic, 6.3-V, X5R, 20%
0402
GRM155R60J225ME Murata
15D
C2, C3,
C5, C6, C7
22 mF
Capacitor, Ceramic, Low Inductance, 6.3V,
X5R, 20%
0603
0603
D
GRM188R60J226ME Murata
A0L
C8
C9
L1
0.1 mF
150 mF
1.5 µH
Capacitor, Ceramic, Low Inductance, 25V,
X7R, 10%
Std
Std
Capacitor, Tantalum, SMT, 150uF 10V,
100mOhm
B45197A2157K409
XFL4020-152ME
Kemet
Coilcraft
Inductor, Power, 4.1A, ±20%
0.157 x 0.157
inch
1
1
3
1
R1
R2
1.02M
182k
Resistor, chip, 1/16-W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
0603
Std
Std
Std
Std
TI
0603
Std
R3, R4, R5 1.00M
U1
0603
Std
_
IC, High Efficiency Single Inductor
SON-14
TPS63020DSJ
Buck-Boost Converter w/ 4-A Switches
4.3 Related Documentation From Texas Instruments
TPS63020, High-Current, Buck-Boost Converter data sheet (SLVS916)
4.4 If You Need Assistance
Contact your local TI sales representative.
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FCC Warnings
This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequency energy and
has not been tested for compliance with the limits of computing devices pursuant to subpart J of 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 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 EVALUATION PURPOSES ONLY 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 STATUTORY, INCLUDING ANY WARRANTY OF
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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 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 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
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 3 V to 5.5 V. Maximum recommended output current is 1000 mA with
3.6-V input.
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.
During normal operation, some circuit components may have case temperatures greater than 50°C . The EVM is designed to operate
properly with certain components above 50°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.
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