Texas Instruments TPS6236 EVM-655 Series, TPS62360EVM-655, TPS62361BEVM-655, TPS62362EVM-655, TPS62365EVM-655 User Manual
User's Guide
SLVU425A–April 2011–Revised July 2011
TPS6236xEVM-655
This user’s guide describes the characteristics, operation, and use of the TPS62360EVM-655
(HPA655-001), the TPS62361BEVM-655 (HPA655-002), the TPS62362EVM-655 (HPA-003), and the
TPS62365EVM-655 (HPA655-004) evaluation modules (EVMs). These EVMs demonstrate the Texas
Instruments TPS62360, TPS62361B, TPS62362, or TPS62365 Processor Supply with I2C Interface and
Remote Sense. This document includes setup instructions, a schematic diagram, bill of materials, and
PCB layout drawings for the evaluation module. The only difference between the 4 versions of the EVM is
the TPS6236x IC, U1.
Contents
1 Introduction .................................................................................................................. 2
2 Setup ......................................................................................................................... 3
3 Software Setup and Operation ............................................................................................ 6
4 Circuit Use and Modifications ............................................................................................. 8
5 Test Results ................................................................................................................. 9
6 Board Layout ............................................................................................................... 14
7 Schematic and Bill of Materials .......................................................................................... 17
List of Figures
1 TPS6236x Software Main Panel.......................................................................................... 6
2 Efficiency vs. Input Voltage (I
3 Efficiency vs. Output Current (VIN= 3.6V, V
4 Load Regulation (V
5 Line Regulation (V
6 Start-up (VIN= 3.6V, V
7 Shutdown (VIN= 3.6V, V
OUT
OUT
= 1.4V, I
= 1.4V, V
OUT
OUT
8 Output Voltage Ripple (VIN= 3.6V, V
9 Input Voltage Ripple (VIN= 3.6V, V
10 Load Transient Response (VIN= 3.6V, V
11 Thermal Performance (VIN= 3.6V, V
OUT
IN
OUT
= 1.4V, I
= 1.4V, I
= 1.5A, V
= 1.4V) ................................................................. 9
OUT
= 0.92, 1.16, 1.4, 1.7)............................................... 9
OUT
= 3.6V) ............................................................................. 10
= 1.5A).............................................................................. 10
= 1.5A) ......................................................................... 11
OUT
= 0, output cap discharge enabled)...................................... 11
OUT
OUT
OUT
OUT
= 1.4V, I
= 1.4V, I
= 1.4V, I
OUT
= 1.4V, I
= 3A)........................................................... 12
OUT
= 3A)............................................................. 12
OUT
= 1A to 2A step)......................................... 13
OUT
= 3A)........................................................... 13
OUT
12 Assembly Layer............................................................................................................ 14
13 Top Layer................................................................................................................... 15
14 Layer 2...................................................................................................................... 15
15 Layer 3 ..................................................................................................................... 16
16 Bottom Layer............................................................................................................... 16
17 TPS6236xEVM-655 Schematic.......................................................................................... 17
List of Tables
1 Performance Specification Summary..................................................................................... 2
2 Default Jumper Settings.................................................................................................... 5
3 TPS6236x Solution Required Components............................................................................ 18
4 TPS6236xEVM-655 Evaluation Components.......................................................................... 18
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Introduction
1 Introduction
1.1 Requirements
To operate this EVM, connect and properly configure the following components:
A personal computer (PC) with a USB port is required to operate this EVM. The TPS6236x interface
software runs on the PC and communicates with the EVM via the PC’s USB port. Commands can be
sent to the internal registers of the TPS6236x through the USB port. The software has been tested with
the PC requirements listed below. It may work with other operating systems and configurations, but
this has not been verified.
Personal Computer Requirements
• Windows XP™ operating system
• .NET 2.0 or higher
• USB port
• 10 MB of free hard disk space
• 512 MB of RAM
USB-TO-GPIO Adapter
The USB-TO-GPIO adapter is the link that allows the PC and the EVM to communicate. One end of
the USB-TO-GPIO adapter connects to the PC with the supplied USB cable. The other end of the
USB-TO-GPIO adapter connects to the EVM with the supplied ribbon cable.
When a command is written to the EVM, the interface program running on the PC sends the
commands to the PC USB port. The USB-TO-GPIO adapter receives the USB command, converts the
signal to an I2C protocol, and sends the I2C signal to the TPS6236x EVM board.
Software
Texas Instruments provides software to assist in evaluating this EVM. This software can be
downloaded from the TPS6236xEVM-655 Product Page, located at:
http://focus.ti.com/docs/toolsw/folders/print/tps62360evm-655.html.
Printed-Circuit Board Assembly
The board contains the either the TPS62360, TPS62361B, TPS62362, or TPS62365 IC and the
required external components to evaluate it as a processor power supply solution.
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1.2 Performance Specification Summary
A summary of the performance specifications is provided in Table 1. Specifications are given for an input
voltage of 3.6V and an output voltage of 1.4V, unless otherwise specified. The TPS6236x is designed and
tested for VIN= 2.5V to 5.5V. The ambient temperature is 25°C for all measurements, unless otherwise
noted.
Table 1. Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
VINvoltage range 2.5 3.6 5.5 V
Output voltage set point - TPS62360/2 Programmable in 10 mV steps 0.77 1.4 V
Output voltage set point - TPS62361B/5 Programmable in 10 mV steps 0.5 1.77 V
Output current range - TPS62360, TPS6361B, TPS62362 0 3 A
Output current range - TPS62365 0 3.5 A
Line regulation I
Load regulation VIN= 3.6V, V
Load transient response
Input ripple voltage VIN= 3.6V, V
Output ripple voltage VIN= 3.6V, V
2
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I
I
OUT
OUT
OUT
= 1.5A, V
= 1A to 2A
= 2A to 1A
= 1.4V ±0.1%
OUT
= 1.4V ±0.15%
OUT
Voltage change 40 mV
Recovery time 10 μs
Voltage change 45 mV
Recovery time 8 μs
OUT
OUT
= 1.4V, I
= 1.4V, I
= 3A 120 mV
OUT
= 3A 10 mV
OUT
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PP
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Table 1. Performance Specification Summary (continued)
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
Maximum efficiency VIN= 3.6V, V
2 Setup
This section describes the jumpers and connectors on the EVM as well as how to properly connect, set
up, and use the TPS6236xEVM-655.
2.1 Connector/Jumper Descriptions
OUT
= 1.7V, I
= 750mA 91.4%
OUT
Setup
2.1.1 J1 – V
IN
This header is for the positive input supply voltage to the converter. The leads to the input supply should
be twisted and kept as short as possible to minimize EMI transmission and reduce inductive voltage droop
at a load transient event. This voltage should be between 2.5V and 5.5V.
2.1.2 J2 – S+/S-
Sense connector for VIN. Connect input supply's sense leads to this point. Monitor the VINvoltage at this
point.
2.1.3 J3 – GND
This is the return connection for the input power supply of the converter. The leads to the input supply
should be twisted and kept as short as possible to minimize EMI transmission and reduce inductive
voltage droop at a load transient event.
2.1.4 J4 – V
OUT
This header connects to V
below 1A. If the load current will exceed 1A, use terminal block J7 instead. The leads to the load should
be twisted and kept as short as possible to minimize EMI transmission and reduce inductive voltage droop
at a load transient event.
2.1.5 J5 – SNS+/SNS-
Remote sense connector for the IC. For proper regulation, this must be connected at the load. This is
a high impedance connection back to the TPS6236x's remote sense inputs and is required for output
regulation. Monitor the output voltage at this point.
. Connect the load (processor) at this point if the load current will remain
OUT
2.1.6 J6 – GND
This is the return connection for the load. If the load current will exceed 1A, do not use headers J4 and J6,
but use terminal block J7 instead. The leads to the load should be twisted and kept as short as possible to
minimize EMI transmission and reduce inductive voltage droop at a load transient event.
2.1.7 J7 – V
/GND Terminal Block
OUT
This terminal block should be used to connect to the load (processor) if the load current will exceed 1A. If
the load current will remain below 1A, the J4/J6 headers may be used instead. The leads to the load
should be twisted and kept as short as possible to minimize EMI transmission and reduce inductive
voltage droop at a load transient event.
2.1.8 J8 – I2C Connection from USB-TO-GPIO Adaptor
This connects the USB-TO-GPIO adaptor to the TPS6236xEVM-655. It provides the I2C signals and a
3.3V supply for powering VDD. If the USB-TO-GPIO adaptor is not used, do not connect to J8, but connect
the I2C signals to the J9 header instead. This connector is keyed to prevent incorrect installation.
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Setup
2.1.9 J9 – I2C Monitor Point and Alternate Connection
This header is provided to connect to or monitor the I2C signals on the TPS6236xEVM-655. If the I2C
signals are being sent via this header (and not via the USB-TO-GPIO adaptor), do not plug into the J8
header and provide a separate VDDsupply on JP1 without any jumper installed.
2.1.10 J10 – Load Step Signal Input
This SMA connector accepts a signal input from a function generator that drives Q1 in order to evaluate
the TPS6236x's transient response.
2.1.11 JP1 – VDDControl
This jumper is used to connect VDDto either a 3.3V rail provided by the USB-TO-GPIO adaptor (jumper
across pins 1 and 2) or to GND to reset the I2C registers (jumper across pins 2 and 3). Alternatively, the
user can provide their own VDDvoltage (1.15 - 3.6V) between pins 2 and 3 of JP1. No jumper should be
installed in this case. For normal operation without an external supply voltage, the jumper should be
installed between pins 1 and 2.
2.1.12 JP2 – VSEL0
This jumper sets the VSEL0 pin to either a logic high (jumper across pins 1 and 2) or a logic low (jumper
across pins 2 and 3).
2.1.13 JP3 – VSEL1
This jumper sets the VSEL1 pin to either a logic high (jumper across pins 1 and 2) or a logic low (jumper
across pins 2 and 3).
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2.1.14 JP4 – EN
This jumper sets the EN pin to either a logic high (jumper across pins 1 and 2) or a logic low (jumper
across pins 2 and 3). When EN is low, the TPS6236x output will be off and not switching. Set EN to high
to turn on the output voltage.
2.2 Software Setup
The software is available at the TI website,
http://focus.ti.com/docs/toolsw/folders/print/tps62360evm-655.html.
Download and unzip the file. Run setup.exe and follow the on screen instructions to complete the
installation.
NOTE: This installation page is best viewed with Microsoft Internet Explorer browser (it may not
work correctly with other browsers)
The Microsoft .Net Framework 2.0 is required for the software to run.
After installation, the software should automatically run. To run the software later, go to
Start→All Programs→Texas Instruments→TPS6236x EVM→TPS6236x EVM.
During future use of the software, it may prompt you to install a new version if one becomes available on
the Web.
NOTE: VeriSign™ Code Signing is used to prevent any malicious code from changing this
application. If at any time in the future the binaries are modified, the code will no longer
attempt to run.
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Host
Computer
USBCable
USB
Interface
Adapter
GreenLED
Indicates
Power
10-Pin
Ribbon
Cable
EVMBoard
USBInterface AdaptorQuickConnectionDiagram
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2.3 Hardware Setup
Table 2 shows the board default jumper settings.
Connect the USB-TO-GPIO adapter to your PC using the supplied USB cable. Connect the
TPS6236xEVM connector J8 to the USB-TO-GPIO adapter using the supplied 10-pin ribbon cable. The
connectors on the ribbon cable are keyed to prevent incorrect installation.
Setup
Table 2. Default Jumper Settings
JUMPER DEFAULT
JP1 Installed across pins 1 and 2
JP2 Installed across pins 2 and 3
JP3 Installed across pins 2 and 3
JP4 Installed across pins 1 and 2
Connect the load (processor) to either the output headers J4 and J6 (for currents below 1A) or to the
output terminal block J7 (for currents greater than 1A). The leads should be short and twisted.
Connect the SNS+ and SNS- signals from header J5 to the load. For proper regulation, these must be
connected to the output.
Install jumpers, JP1 through JP4 to the desired positions. Jumper JP1 must be across pins 1 and 2 for the
TPS6236x to operate.
Connect at least a 3 A rated input power supply, set to provide between 2.5V and 5.5V, between J1 and
J3. The leads should be short and twisted. Turn on the power supply.
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Software Setup and Operation
3 Software Setup and Operation
This section provides descriptions of the EVM software and functionality.
The supplied software is used to communicate with the TPS6236xEVM. Click on the icon on the host PC
to start the software. The host PC software first checks the firmware version of the USB-TO-GPIO
adapter. If an incorrect firmware version is installed, the software automatically searches on the Internet (if
connected) for updates. If a new update is available, the software notifies the user of the update,
downloads and installs the software. Note that after the firmware is updated, the user must disconnect and
then reconnect the USB cable between the adapter and PC, as instructed during the install process. The
host PC software also automatically searches on the Internet (if connected) for updates to the EVM
software. If a new update is available, the software notifies the user of the update, downloads and installs
the update.
VINand VDDmust be supplied for the software to detect the TPS6236x and run.
The software reads the registers on the TPS6236x and automatically determines which version of the IC is
installed. Even if the IC is disabled via the EN pin (JP4), the user can still communicate with the
TPS6236x if VINand VDDare supplied. If no IC is detected, the software will abort loading.
The software displays the main panel for the user interface, shown in Figure 1.
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Figure 1. TPS6236x Software Main Panel
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It is recommended that the user press the 'READ' button at the top of the screen immediately after loading
the software to confirm that the software and cable connections are working properly. The message box at
the top right of the main panel (I2C Activity) displays all I2C activity. The message box at the bottom (USB
Bridge Connected) displays whether or not the USB-TO-GPIO connection is functional.
The software itself performs no calculations or computations and simply reads and writes to and from the
IC's registers through the I2C interface. Each register's bits can either be changed manually by changing
the boxes corresponding to each bit in the panel's bottom left half (REGISTERS section), or they can be
changed through the drop-down boxes and buttons in the rest of the panel. Some bits are reserved and
not writeable. These will not allow you to click on them to change their setting. For example, since the
TPS62360 does not have an operational register bit at bit 6 of registers 0x00h through 0x03h, the
TPS62360's main panel will not allow writes to those bits. The I2C bus speed is fixed at 100 kbps and this
is noted at the bottom of the screen.
Following any change to an individual bit, drop-down box, or button, the user must write the new values to
the registers by either clicking the 'W' button to the left of each affected register or by clicking the 'WRITE'
button at the top of the screen.
In order to reduce the amount of manual reading and writing required, the two drop-downs at the top left of
the screen have been provided to do this automatically. The 'Auto Read' drop down allows the option of
automatically reading all the registers at specific time intervals. The 'Write On Changes' drop-down allows
the option of automatically writing a change to the registers as soon as it is made in the software.
The TPS6236x datasheet is available via the 'Help' menu (Internet access is required). The datasheet
discusses the functionality of the various register bits, which is also briefly repeated here.
The drop-downs in the top left section of the software (SET0-SET3 section) correspond to registers 0x00h
thought 0x03h in the TPS6236x. These registers set the target output voltage and operating mode
(PFM/PWM or forced PWM). The output voltage on the TPS62360/2 is settable in 10 mV steps between
0.77V and 1.4V. The output voltage on the TPS62361B/5 is settable in 10 mV steps between 0.5V and
1.77V. The operating mode is either PFM/PWM, in which the IC is allowed to skip switching pulses at light
loads to keep the converting efficiency high, or forced PWM mode, in which the IC allows negative
inductor current at light loads to maintain a specific switching frequency and output noise. The TPS6236x
only runs at the settings of one of these four registers at a time. This operating register is selected by the
VSEL0 and VSEL1 jumpers and can be changed during operation.
The top right section of the software (CONTROLS section) contains the functionality of registers 0x04h
and 0x06h and some of the functionality of register 0x05h. The first 3 check boxes enable an internal
resistor on any of the EN, VSEL0, or VSEL1 pins. This resistor, which is internal to the TPS6236x, would
keep that pin in a defined state if it were left floating. The 'Disable Temperature shutdown feature' bit
disables the temperature shutdown internal to the IC, if selected. The 'Enable Active output capacitor
discharge at shutdown' forces the IC to actively discharge the output capacitor during shutdown. The first
drop-down sets the output voltage ramp timing and the final drop-down describes the ramp behavior when
the TPS6236x is changing its output voltage in PFM mode.
The bottom right section of the software (STATUS section) contains the remaining bits in register 0x05h.
The top indicator is green if the IC die temperature is low enough and turns red when the bit is set
corresponding to a die temperature exceeding 120°C typical. The indicator on the bottom turns red if
thermal shutdown has occurred. When this does occur, the TPS6236x will latch off and the temperature
must decrease below a hysteresis amount and the TJTemp shutdown bit needs to be reset by the user.
The button at the bottom of this section is provided for this purpose.
Software Setup and Operation
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