Texas Instruments TPS65276V PMIC Bedienungsanleitung

User's Guide

SLVU878–February 2013

4.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous

Step-Down Converter With I2C Controlled VID and Current

Sharing Evaluation Module

This document is provided with the TPS65276V PMIC evaluation module (EVM) as a supplement to the

TPS65276V datasheet. This user's guide includes the schematic, hardware setup, software installation

and bill of materials (BOM).

Contents

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

2 Background .................................................................................................................. 2

3 TPS65276V Schematic ..................................................................................................... 3

4 Board Layout ................................................................................................................ 4

5 Bench Test Setup Conditions ............................................................................................. 7

5.1 Header Description and Jumper Placement .................................................................... 7

5.2 Hardware Requirement ............................................................................................ 8

5.3 Hardware Setup .................................................................................................... 8

5.4 Installing Software ................................................................................................. 9

5.5 Software Operation ............................................................................................... 10

6 Power-Up Procedure ...................................................................................................... 11

7 TPS65276V EVM Bill of Materials ....................................................................................... 12

List of Figures

1 TPS65276V Schematic..................................................................................................... 3

2 Component Placement (Top Layer) ...................................................................................... 4

3 Board Layout (Top Layer).................................................................................................. 5

4 Board Layout (Second Layer)............................................................................................. 5

5 Board Layout (Third Layer)................................................................................................ 6

6 Board Layout (Bottom Layer).............................................................................................. 6

7 Header Description and Jumper Placement............................................................................. 7

8 USB Interface Adapter Quick Connection Diagram .................................................................... 9

9 Screen Capture of TPS65276V Software GUI Interface ............................................................. 10

List of Tables

1 Summary of Performance.................................................................................................. 2

2 Input/Output Connection ................................................................................................... 7

3 Jumpers and Switches ..................................................................................................... 8

4 TPS65276V EVM Bill of Materials....................................................................................... 12

Windows, Microsoft, Internet Explorer are registered trademarks of Microsoft Corporation.

VeriSign is a trademark of VeriSign, Inc.

SLVU878–February 2013 4.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down

Converter With I2C Controlled VID and Current Sharing Evaluation Module

Introduction

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1 Introduction

This document presents the information required to operate the TPS65276V PMIC as well as the support

documentation including schematic, layout, hardware setup, software installation and bill of materials.

2 Background

The TPS65276V PMIC is designed to provide dual (6.5 A and 3.5 A) continuous currents with an

operational range of 4.5 to 18 V. The TPS65276V features I2C controlled voltage identification (VID) and

the output voltage can be set by I2C from 0.68 V to 1.95 V. Without I2C, voltage can also be programmed

by an external resistor divider. The TPS65276V features externally programmed switching frequency

ranging from 200 kHz to 1.6 MHz, external compensation, soft-start and enable.

As there are many possible options to set the converters, Table 1 presents the performance specification

summary for the EVM.

Table 1. Summary of Performance

Test Conditions Performance

Vin = 4.5 V to 18 V Buck1 : 1.0 V, up to 6 A, VID control

fsw = 500 kHz (25°C ambient) Buck2 : 1.1 V, up to 3.5 A, VID control

The EVM is designed to provide access to the features of the TPS65276V. Some modifications can be

made to this module to test performance at different input and output voltages, current and switching

frequency. Please contact TI Field Applications Group for advice on these matters.

24.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down SLVU878–February 2013

Converter With I2C Controlled VID and Current Sharing Evaluation Module Submit Documentation Feedback

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TPS65276V Schematic

3 TPS65276V Schematic

Figure 1 shows the TPS65276V PMIC EVM schematic.

Figure 1. TPS65276V Schematic

SLVU878–February 2013 4.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down Converter

With I2C Controlled VID and Current Sharing Evaluation Module

Board Layout

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4 Board Layout

Figure 2 through Figure 6 illustrate the printed-circuit boards for this EVM.

Figure 2. Component Placement (Top Layer)

44.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down SLVU878–February 2013

Converter With I2C Controlled VID and Current Sharing Evaluation Module Submit Documentation Feedback

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Board Layout

Figure 3. Board Layout (Top Layer)

Figure 4. Board Layout (Second Layer)

SLVU878–February 2013 4.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down

Converter With I2C Controlled VID and Current Sharing Evaluation Module

Board Layout

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Figure 5. Board Layout (Third Layer)

Figure 6. Board Layout (Bottom Layer)

64.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down SLVU878–February 2013

Converter With I2C Controlled VID and Current Sharing Evaluation Module Submit Documentation Feedback

J31:

VOUT2

J18:

VOUT1

JP1/EN1

JP2/EN2

JP7/ADDR

JP8/MODE

GND

J1:5/12V

JP9:I C IO

POWER

JP15/I C

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Bench Test Setup Conditions

5 Bench Test Setup Conditions

5.1 Header Description and Jumper Placement

Figure 7 illustrates the header description and jumper placement for the EVM.

Test points:

A: LX of Vout1

B: LX of Vout2

Vout1, Vout2

Figure 7. Header Description and Jumper Placement

Table 2 shows the I/O connections for the EVM.

Table 2. Input/Output Connection

Jumper Number Function Description

J1 Vin Connector Apply power supply to this connector

J18 Buck1 Connector Output of Buck1

J31 Buck2 Connector Output of Buck2

SLVU878–February 2013 4.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down

Converter With I2C Controlled VID and Current Sharing Evaluation Module

Bench Test Setup Conditions

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Table 3 shows the jumpers and switches for the EVM.

Table 3. Jumpers and Switches

Jumper Function Placement Comment

Number

JP1 Buck1 enable (EN1) Connect EN1 to GND to disable Vout1, connect EN1 to

Vin through a 100-kΩresistor to enable Vout1; Leave

open to enable Vout1

JP2 Buck2 enable (EN2) Connect EN2 to GND to disable Vout2, connect EN2 to

Vin through a 100-kΩresistor to enable Vout2; Leave

open to enable Vout2

JP7 I2C address I2C address configuration pin. Connect this pin to GND On board Vcc is 6.25 V

to set address 0x60H; connect it to Vcc to set address

0x61H; leave it open to set address 0x62H

JP8 Mode Operation mode control pin. Connect this pin to GND to

set forced PWM mode; leave the pin open to set auto

PSM-PWM; connect this pin to Vcc, set the IC to run in

current share mode.

JP9 I2C Power Power connected to the I2C IO pull-up resistor; Leave On board Vcc is 6.25 V

the two pins un-connected set the power to be 3.3V from

the I2C interface adaptor; short the two pins set the

power to be Vcc.

JP15 I2C interface connector Pin 5 is 3.3 V from adaptor; pin 6 is Ground; pin 9 is

SCL, pin 10 is SDA.

5.2 Hardware Requirement

This EVM requires an external power supply capable of providing 4.5 V to 18 V at 7 A.

A function generator capable of driving the SYNC pin with 0.4- to 3.3-V amplitude and a 200-kHz to 1.6-

MHz square wave signal is required for synchronization. The EVM kit includes a USB-TO-GPIO interface

box which, when installed on a PC and connected to the EVM, allows communication with the EVM via a

GUI interface. The minimum PC requirements are:

• Windows®2000 or Windows XP operating system

• USB port

• Minimum of 30 MB of free hard disk space (100 MB recommended)

• Minimum of 256 MB of RAM

5.3 Hardware Setup

After connecting the power supply to J1, turn on the power supply, and connect JP1 to Vin through a 100-

kΩresistor, connect JP2 to Vin through a 100-kΩresistor, connect JP7 to GND, connect JP8 to GND, the

EVM will regulate the output voltages to the values shown in Table 1. Additional input capacitance may be

required in order to mitigate the inductive voltage droop that may occur during a load transient event.

The output voltage is changed by sending the digital control signal via a PC running the TPS65276V

controller software and USB-TO-GPIO interface box. Change the output voltage with the following steps:

• Connect one end of the USB-TO-GPIO box to the PC using the USB cable and the other end to JP15

of the TPS65276V using the supplied 10-pin ribbon cable as shown in Figure 8. The connectors on the

ribbon cable are keyed to prevent incorrect installation.

• Connect the power supply on J1, and turn on the power supply.

• Run the software as explained in the next section.

84.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down SLVU878–February 2013

Converter With I2C Controlled VID and Current Sharing Evaluation Module Submit Documentation Feedback

Host

Computer

USB Cable

USB

Interface

Adapter

Green LED

Indicates

Power

10-Pin

Ribbon

Cable

EVM Board

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Bench Test Setup Conditions

Figure 8. USB Interface Adapter Quick Connection Diagram

5.4 Installing Software

If installing from the TI Web site, go to www.ti.com.

Note: This installation page is best viewed with the Microsoft®Internet Explorer®browser (It may not

work correctly with other browsers)

Click on the install button; your PC should give you a security warning and ask if you want to install this

application. Select Install to proceed. If a pre-release or Beta version is currently installed on your PC, you

must uninstall this version of the software before installing the final version.

To run the software after installation, go to Start →All programs →Texas Instruments →TPS65276V

EVM Software.

At start-up, the software first checks the firmware version of the USB-TO-GPIO adapter box. 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 gives notification of the update, and downloads and

installs the software. Note that after the firmware is updated the USB cable between the adapter and PC

must be disconnected and then reconnected, as instructed during the install process. The host PC

software also automatically searches on the internet (if connected) for updates. If a new update is

available, the software gives notification of the update and downloads and installs it. During future use of

the software, a prompt may be given to install a new version, if one becomes available.

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.

SLVU878–February 2013 4.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down

Converter With I2C Controlled VID and Current Sharing Evaluation Module

Check “Shutdown” box to shutdown

Buck 1 or Buck 2

Check “VID Enable” box to set to output

voltage by VID Change Vout transition slew rate

Output Voltage Selection Pulldown Boxes Mode Selection option

Internal Register Values, can be

altered bit by bit if desired. Updates register

when “Write” button is pushed.

Bench Test Setup Conditions

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5.5 Software Operation

This section provides descriptions of the EVM software.

The supplied software is used to communicate with the TPS65276V EVM. Click on the icon on the host

computer to start the software. The software displays the main control panel for the user interface

(Figure 9).

Figure 9. Screen Capture of TPS65276V Software GUI Interface

Figure 9 shows the GUI control interface. There are five 8-bit registers embedded in TPS65276V, two to

select the output voltage, two to configure the buck converter’s operation, and one for status feedback.

Changes are made by selecting and checking the components in the GUI on the left hand side and can

also be made by directly clicking the bits of each register. I2C address is set to default 0x60H, this address

is corresponding to the EVM jumper JP7 to connect to GND. Changing the I2C address requires that the

EVM be configured accordingly.

An option is to “write on change”, if this option is set to ON, any change is sent to the EVM immediately; if

this option is set to OFF, “Write” button or “W” button for each register must be clicked to send the control

signal.

10 4.5-V to 18-V Input, Dual (6.5-A and 3.5-A) Synchronous Step-Down SLVU878–February 2013

Converter With I2C Controlled VID and Current Sharing Evaluation Module Submit Documentation Feedback

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