Texas Instruments TPS60250EVM-185 Bedienungsanleitung

User's Guide

SLVU208B–April 2007–Revised December 2012

TPS60250EVM-185

Contents

1 Introduction .................................................................................................................. 1

2 Setup ......................................................................................................................... 2

3 Board Layout ................................................................................................................ 6

4 Schematic and Bill of Materials ........................................................................................... 9

List of Figures

1 TPS60250 Software Screenshot.......................................................................................... 5

2 Assembly Layer ............................................................................................................. 6

3 Top Layer Routing .......................................................................................................... 7

4 Bottom Layer Routing ...................................................................................................... 8

5 TPS60250EVM-185 Schematic........................................................................................... 9

List of Tables

1 Factory EVM Jumper Settings ............................................................................................ 4

2 TPS60250EVM-185 Bill of Materials.................................................................................... 10

1 Introduction

The Texas Instruments TPS60250EVM-185 evaluation module (EVM) helps designers evaluate the

operation and performance of the TPS60250 white LED (WLED) driver for applications that are powered

with one Li-ion or Li-polymer cell and require two or three separate banks of WLEDs. The TPS60250

contains a 1×/1.5× chargepump, as well as seven current sinks that are configured into a main display

bank of four or five WLEDs and a sub-display bank of two WLEDs. Additionally, the fifth main display

WLED can be configured to drive an aux display at up to 80 mA for backlighting a keypad or a weak

camera flash.

SLVU208B–April 2007–Revised December 2012 TPS60250EVM-185

Setup

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2 Setup

This chapter describes the jumpers and connectors on the EVM, as well as how to properly connect, set

up, and use the TPS60250EVM-185.

2.1 Input/Output Connector Descriptions

J1 – VIN

This is the positive input voltage connection to the converter. The EVM operates from any supply voltage

between 3 V and 6 V. The leads to the input supply should be twisted and kept as short as possible to

minimize EMI transmission and input voltage droop.

J2 – GND

This is the input return connection for the input power supply.

J3 – USB to GPIO Connector

This is the connector for the interface box. Connect a ribbon cable of the interface box to this device.

J4 – VLED CATHODE DM5

This is the DM5 connection for using an external aux display WLED bank. Connect the cathode(s) of the

external aux display bank to this input.

J5 – VLED ANODE DM5

This is the anode connection for using an external aux display WLED bank. Connect the anode(s) of the

external aux display bank to this output.

JP1 – DM1

JP1 is used to connect the cathode of the DM1 LED to the DM1 pin on the TPS60250. Place a shunt on

JP1 to connect the WLED to the DM1 input. Remove the shunt to measure the DM1 current or use an

external WLED for DM1.

JP2 – DM2

JP2 is used to connect the cathode of the DM2 LED to the DM2 pin on the TPS60250. Place a shunt on

JP2 to connect the WLED to the DM2 input. Remove the shunt to measure the DM2 current or use an

external WLED for DM2.

JP3 – DM3

JP3 is used to connect the cathode of the DM3 LED to the DM3 pin on the TPS60250. Place a shunt on

JP3 to connect the WLED to the DM3 input. Remove the shunt to measure the DM3 current or use an

external WLED for DM3.

JP4 – DM4

JP4 is used to connect the cathode of the DM4 LED to the DM4 pin on the TPS60250. Place a shunt on

JP4 to connect the WLED to the DM4 input. Remove the shunt to measure the DM4 current or use an

external WLED for DM4.

JP5 – DM5

JP5 is used to connect the cathode of the DM5 LED to the DM5 pin on the TPS60250. Place a shunt on

JP5 to connect the WLED to the DM5 input. Remove the shunt to measure the DM5 current or use an

external WLED for DM5.

JP6 – DS1

JP6 is used to connect the cathode of the DS1 LED to the DS1 pin on the TPS60250. Place a shunt on

JP6 to connect the WLED to the DS1 input. Remove the shunt to measure the DS1 current or use an

external WLED for DS1.

2TPS60250EVM-185 SLVU208B–April 2007–Revised December 2012

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Setup

JP7 – DS2

JP7 is used to connect the cathode of the DS2 LED to the DS2 pin on the TPS60250. Place a shunt on

JP7 to connect the WLED to the DS2 input. Remove the shunt to measure the DS2 current or use an

external WLED for DS2.

2.2 Equipment Requirements

In order for this EVM to operate properly, the following components must be connected and properly

configured.

2.2.1 Personal Computer

A computer with a USB port is required to operate this EVM. The TPS60250 interface software, which is

run on the personal computer (PC), communicates with the EVM via the PC USB port. The user sends

commands to the EVM and reads the contents of the TPS60250 internal registers through the USB port.

2.2.2 Printed Circuit Board Assembly

The TPS60250EVM-185 PCB contains the TPS60250 IC and its required external components. This

board contains several jumpers and connectors that allow the user to customize the board for specific

operating conditions.

2.2.3 USB to I2C Adapter

The HPA172 is the link that allows the PC and the EVM to communicate. The adapter connects to the PC

with the supplied USB cable on one side and to the EVM though the supplied ribbon cable on the other.

When the user writes a command to the EVM, the interface program, which is run from the PC, sends the

command to the PC USB port. The adapter receives the USB command and converts the signal to an I2C

protocol. It then sends the I2C signal to the TPS60250 board. When the user reads a status register from

the EVM, the PC sends a command to read a register on the EVM. When the EVM receives the

command, it reports the status of the register via the I2C interface. The adapter receives the information on

the I2C interface, converts it to a USB protocol, and sends it to the PC.

2.2.4 Software

Texas Instruments provides software to assist the user in evaluating this EVM. Check the TPS60250EVM-

185 product folder (http://www.ti.com/tool/tps60250evm-185) on the TI Web site for the latest version of

the software.

2.2.5 Power Supplies

The TPS60250 EVM requires one power supply for operation. It may need to supply several hundred mA,

depending on the WLED currents.

2.3 Operation

The following steps must be followed before the EVM can be operated.

1. Install the TPS6025xEVM software.

2. Connect the input voltages to the EVM.

3. Configure all EVM jumpers to the factory settings in Table 1.

4. Connect the ribbon cable between the EVM and the USB-TO-GPIO (HPA172) adapter.

5. Connect the USB cable between the computer and USB-TO-GPIO adapter

6. Run the TPS6025xEVM software.

SLVU208B–April 2007–Revised December 2012 TPS60250EVM-185

Setup

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Table 1. Factory EVM Jumper Settings

Jumper Shunt Location

JP1 Installed

JP2 Installed

JP3 Installed

JP4 Installed

JP5 Installed

JP6 Installed

JP7 Installed

2.3.1 TPS6025x Software Operation

The software is designed to work with the entire TPS60250/1/2 family of devices. A screenshot of the

software is shown in Figure 1. Upon being opened, the software asks the user to select which particular

EVM is installed.

The top part of the software contains a link to the device datasheet as well as buttons to read and write all

the registers.

The bottom part of the software indicates that the USB-to-GPIO adaptor is installed and working properly.

It also notes the I2C bus speed (100 kHz).

2.3.1.1 Left Half of Software GUI - Settings

This portion of the software allows the user to enable/disable the different banks of LEDs using simple

check boxes. Open lamp detection may be enabled/disabled using the provided check box. Refer to the

TPS60250 data sheet for a description of the open lamp detection. Additionally, a pulldown box (MODE) is

available to control the aux display settings. The aux display may be grouped with main display or set for

the separate high-current (80 mA) aux display. When using the high-current setting, it is suggested that

separate LEDs are connected between the J5 (cathode connection) and J6 (anode connection)

connectors. The LEDs installed on the EVM are rated for 30-mA dc current and may be damaged at the

higher current. Selecting the shutdown option in the Aux Display pulldown menu disables all of the LEDs

and places the IC in a low-power shutdown mode. The internal registers are not changed in this mode.

Another MODE pulldown box allows selection of what switching mode is used to drive the WLEDs: auto

switch, forced 1x, or forced 1.5x. Finally, there are 3 pulldown boxes at the bottom to set the WLED

current for each of the banks.

2.3.1.2 Right Half of the GUI - Register Map

This portion of the software allows the user to change the registers on a bit level. All this functionality is

already included in the easy to use boxes and pulldowns on the left half side of the GUI.

4TPS60250EVM-185 SLVU208B–April 2007–Revised December 2012

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Setup

Figure 1. TPS60250 Software Screenshot

SLVU208B–April 2007–Revised December 2012 TPS60250EVM-185

Board Layout

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3 Board Layout

This chapter provides the TPS60250EVM-185 board layout and illustrations.

3.1 Layout

Board layout is critical for all switch mode power supplies. Figure 2 through Figure 4 show the board

layout for the TPS60250EVM-185 PCB.

Figure 2. Assembly Layer

6TPS60250EVM-185 SLVU208B–April 2007–Revised December 2012

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Board Layout

Figure 3. Top Layer Routing

SLVU208B–April 2007–Revised December 2012 TPS60250EVM-185

Board Layout

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Figure 4. Bottom Layer Routing

8TPS60250EVM-185 SLVU208B–April 2007–Revised December 2012

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Schematic and Bill of Materials

4 Schematic and Bill of Materials

This chapter provides the TPS60250EVM-185 schematic and bill of materials.

4.1 Schematic

Figure 5. TPS60250EVM-185 Schematic

SLVU208B–April 2007–Revised December 2012 TPS60250EVM-185

Schematic and Bill of Materials

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4.2 Bill of Materials

Table 2. TPS60250EVM-185 Bill of Materials

Count RefDes Value Description Size Part Number MFR

1 C1 1.0uF Capacitor, Ceramic, 25V, X5R, 10% 0603 GRM188R61E105KA12 muRata

2 C2, C3 2.2uF Capacitor, Ceramic, 10V, X5R, 10% 0603 GRM188R61A225KE34 muRata

1 C4 4.7uF Capacitor, Ceramic, 10V, X5R, 10% 0805 GRM21BR61A475KA73 muRata

DM1 - DM5,

7 Diode. LED, White 0.079 × 0.118 NSSW100CT Nichia

DS1, DS2

2 R1, R2 10.0k Resistor, Chip, 1/16W, 1% 0603 Std Std

0 R3, R4 Open Resistor, Chip, 1/16W, 1% 0603

IC, High Efficiency Charge Pump for

1 U1 QFN-16 TPS60250RTE TI

7 WLEDS with I2C Interface

Related Documentation From Texas Instruments

TPS60250 data sheet (SLVS769)

10 TPS60250EVM-185 SLVU208B–April 2007–Revised December 2012

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