Texas Instruments TPS61310EVM-638 Manuale utente

User's Guide

SLVU419–April 2011

TPS61310EVM-638 Evaluation Module User Guide

This user’s guide describes the characteristics, functions, and use of the TPS61310EVM-638 Evaluation

Module (EVM). This EVM demonstrates the Texas Instruments TPS61310 LED camera flash and video

light driver with I2C interface. This document includes setup instructions, a schematic diagram, a bill of

materials and PCB layout drawings for the EVM.

1 INTRODUCTION

The TPS61310 is an integrated system with a broad feature set for driving up to three LEDs for

still-camera flash and video-camera lighting applications. The power stage is capable of supplying a

maximum total current of up to 1600mA (2x400mA for LED1 and LED3, 800mA for LED2).

The device operates as an single, dual or triple channel LED driver generating the required LED forward

voltages. The internal step-up converter boosts the input voltage adjusted to the required LED forward

voltage and controls the LED current with the integrated current sinks.

The internal step-up converter can be used for further applications as well, such as supplying an audio

amplifier.

All functions and feature sets can be either addressed by dedicated hardware pins or with the I2C

interface.

1.1 Requirements

To operate this EVM, connect and properly configure the following components:

•Personal Computer:

–OS: Windows™2000 or Windows™XP

–USB port

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

–Minimum of 256MB of RAM

•Printed Circuit Board Assembly:

–The board containing the TPS61310 in CSP-20 package.

–External components

–High power WLEDs

•USB-To-GPIO Adapter:

–This USB interface adapter is used to evaluate the I2C controlled device via a personal computer

using the USB interface. It receives the USB command, converts the signal into an I2C protocol and

sends the I2C signal to the TPS61310EVM board. The USB-To-GPIO can be supplied at the

following URL: ti.com

•Software:

–Texas Instruments provides software to assist in evaluating this EVM. The software can either be

installed from the supplied CD or download from the TI Web site

SLVU419–April 2011 TPS61310EVM-638 Evaluation Module User Guide

HARDWARE SETUP

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2 HARDWARE SETUP

This section describes the jumpers and connectors of the EVM and how to properly connect, set up and

use the TPS61310EVM-638.

2.1 EVM Hardware Setup

Table 1. Board Input/Output Connector Descriptions

Jumper/Connecter Function

J1 is for the IC positive input supply voltage and ground. The leads to the input supply should be

J1 –VIN/GND twisted and kept as short as possible to minimize EMI transmission and reduce inductive voltage

droop during a load-transient event. VIN should be between 2.5V and 5.5V.

J2 is connected to the device output and GND pins. In flash or movie mode, VOUT is connected to

the LED anodes and can be used to access the high-side LED voltage. In voltage regulation

J2 –VOUT/GND mode, the header can be used to measure the regulated output voltage and connect an external

load.

These headers support external LEDs. The LED1 and LED2 headers link the LED cathodes to the

J3 –device current sinks. The LED anodes are connected to the VOUT output. The TS header is

VOUT/LED1/LED2/TS/GND provided for the NTC resistor (220kΩ) connection.

J4 is connected to the device I2C SCL and SDA. The serial clock and data line can be used to

J4 –SCL/SDA/GND monitor the traffic between the PC and the EVM or set up I2C communication.

J5 –I2C Input for the J5 provides a link to the USB-To-GPIO 10-pin ribbon cable interface. The included software uses

USB-To-GPIO the adapter to communicate with the EVM via the I2C protocol.

J6 –I2C Input for the MSP430 J6 is a 14-pin JTAG interface. It links the device to the MSP430 USB debug interface. The

USB-Debug-Interface MSP430 embedded software uses the adapter to communicate with the EVM via the I2C protocol.

This jumper is used to connect the SCL and SDA to two 2.2kΩpull-up resistors. These resistors

JP1 –I2C Pull-Up are either linked to the board input voltage or to ground. In normal use, the I2C pull-up resistor

should be connected to Vin. This configuration is due to the I2C open-drain architecture.

JP2 is employed if the LED temperature is not monitored. In this case, the TS input should be tied

JP2 –TS to Vin.

The nReset jumper is directly linked to the device hardware reset input. If this pin is LOW, the

JP3 –nReset device is forced to shutdown mode, and the I2C control and all internal control registers are reset.

Otherwise, if nReset = HIGH, the device operates normally.

JP4 is connected to the RF PA synchronization control input of the TPS61310. Tying this input

JP4 –Tx-Mask HIGH switches the LED current from flash to video-light operation. In video-light mode, the peak

current drained from the battery is significantly reduced.

JP5 selects the LED current to a high or low level. If the low current level is selected, the flash

JP5 –STRB1 mode is enabled. In the other configuration, the video light mode is selected.

JP6 –STRB0 JP6 sets STRB0 to Vin or to GND. If STRB0 is HIGH, all the LED current regulators are activated.

The middle pin of JP7 is connected to GPIO/PG on the TPS61310. The jumper is used to set

JP7 –GPIO/PG/XINT GPIO to a high or a low level.

JP8 allows connecting the GPIO/PG pull-up resistor to Vin. It is used to avoid setting a high level

JP8 –Pull-up Resistor when the GPIO pin is not used.

JP9, 10 and 11 –Output These jumpers facilitate LED current measurements.

current evaluation

Table 2. Default Jumper Settings

JUMPER DEFAULT

JP1 High

JP2 Unconnected

JP3 High

JP4 Low

JP5 Low

JP6 High

JP7 Unconnected

JP8 Unconnected

JP9 Connected

2TPS61310EVM-638 Evaluation Module User Guide SLVU419–April 2011

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EVM SOFTWARE SETUP AND OPERATION

Table 2. Default Jumper Settings (continued)

JUMPER DEFAULT

JP10 Connected

JP11 Connected

2.2 I2C Interface Setup

2.2.1 External Connections

Once the jumpers are set, connect the USB-To-GPIO adapter to the PC as shown in the drawing below.

Figure 1. USB Interface Adapter Connection

Connect a positive input voltage between 2.5V and 5.5V with a minimum current capability of 1.3A.

WARNING

This EVM has white LEDs that flash with a very intense light. Eye

protection and/or a diffuser to cover the LEDs during operation are

recommended.

2.3 Software Setup

Either installed from the CD or downloaded from TI website, run Setup.exe and follow all the prompts to

install the software. After installation, the software should automatically run.

3 EVM SOFTWARE SETUP AND OPERATION

3.1 General considerations

The EVM software running on a PC host, communicates with the device and provides access to its

internal registers. First, the host checks if the USB-To-GPIO firmware version is up to date. If it is not,

please download and update to the latest version. Note that after updating the firmware, the USB must be

disconnected and reconnected. The same process applies to the EVM software.

3.2 Software Description

For ease of use, two user interfaces have been implemented: a simple one and a detailed one. The Setup

menu permits switching from one to the other. In both interfaces, special care is taken to warn the user in

case of hardware power or connection problems via indicators at the bottom of the window.

SLVU419–April 2011 TPS61310EVM-638 Evaluation Module User Guide

EVM SOFTWARE SETUP AND OPERATION

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3.2.1 Simple Interface

The simple interface shown below appears by default when running the software.

Figure 2. Simple Interface

Before starting any action, the current limit must be set after powering up the device. Once this is done,

the user can choose two types of light applications. The movie type illustrates a typical DC

continuous-light application such as video lighting. The still type shows a typical camera-flash application.

In both cases, the various LED parameters are easily modified by using the sliders. The battery droop is

also selectable among several values.

To run and stop the chosen configuration, a START and a STOP button are provided.

4TPS61310EVM-638 Evaluation Module User Guide SLVU419–April 2011

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EVM SOFTWARE SETUP AND OPERATION

3.2.2 Detailed Interface

The second interface puts forward all the TPS61310 features through the modeling of internal registers.

Figure 3 illustrates the detailed interface of the evaluation software.

Figure 3. Detailed Interface

The toolbar allows control of parameters which are only accessible through the software. In addition to

normal register Read and Write, the software has an Auto-read and a Write-On-Change function. The I2C

activity box shows the action (Read or Write), the register address and data, and the number of transfers

between the host and the device. The Watchdog Reset list-box is a DC light dedicated function which is

aimed at refreshing the video mode of the IC.

This interface performs no calculations or computations; it simply reads and writes to and from the IC

registers through the I2C interface.

As explained before, prior to use any features of the device, the ILIM bit must be set. Each register bits

can be changed manually by clicking on the buttons corresponding to each bit in the panel, or can be

changed through the drop-down boxes, check-boxes and buttons. Read-only bits are listed in the

group-box Status/Flags.

The Reset and Read button writes REGISTER0[0]=1 and reads all the registers. Values shown in the

table may differ from those presented in the datasheet as some bits assume two different functions in read

and write operations.

SLVU419–April 2011 TPS61310EVM-638 Evaluation Module User Guide

t - Time = 1 ms/div

(500mA/div)

LED2

V = 3.6V, V = 4.95V, I = 1750mA

IN OUT LIM

LED2 Channel Only

DCLC2[2:0] = 000

FC2[5:0] = 100000

STRB0

(2V/div)

LED2 Pin Headroom Voltage

(1V/div)

(1V/div - 3.6V Offset)

OUT

100

LED Power Efficiency (PLED/PIN) - %

2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3

V - Input Voltage - V

ILED1 = 50 mA

ILED2 = 100 mA

ILED3 =

I = 1750 mA,

Tx-MASK = Low

LIM

ILED1 = 0 mA

ILED2 = 200 mA

ILED3 = 10

ILED1 = 5 mA

ILED2 = 150 mA

ILED3 = 7

ILED1 = 50 mA

ILED2 = 550 mA

ILED3 = 2

ILED1 = 50 mA

ILED2 = 600 mA

ILED3 = 3

ILED1 = 50 mA

ILED2 = 450 mA

ILED3 = 2

t - Time = 200 µs/div

MODE_CTRL[1:0] = 01

DC Light Turn-On

(50mA/div)

LED2

(200mA/div)

V = 3.6V, V = 4.95V

I = 1750mA

IN OUT

LIM

LED2 Channel Only

DCLC2[2:0] = 100

(2V/div)

OUT

2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3

V - Input Voltage - V

100

LED Power Efficiency (PLED/PIN) - %

ILED2 = 75 mA

ILED2 = 100 mA

ILED2 = 150 mA

ILED2 = 225 mA

I = 1750 mA,

Tx-MASK = Low

LED2 Channel

LIM

TEST RESULTS

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4 TEST RESULTS

4.1 Flash mode

Figure 4. LED Power Efficiency Figure 5. Flash Sequence

Input Voltage

4.2 Video Light mode

Figure 6. LED Power Efficiency vs Input Voltage Figure 7. Video Light Startup

6TPS61310EVM-638 Evaluation Module User Guide SLVU419–April 2011

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t - Time = 50 s/divm

(500mA/div)

(500mV/div - 4.95V Offset)

OUT

V = 3.6V,

IN V = 4.95V

I = 1750mA

OUT

LIM

PFM/PWM Operation

ENPSM bit = 1

(500mA/div)

OUT

50mA to 500mA Load Step

100

1 10 100 1000 10000

I - Output Current - mA

Efficiency - %

V = 4.2 V

V = 3.6 V

V = 2.5 V

V = 4.95 V

Voltage Mode Regulation

OUT

I = 1750 mA

LIM

V = 3 V

PFM/PWM Operation

Forced PWM Operation

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BOARD LAYOUT

4.3 Voltage Mode

Figure 8. Efficiency vs Input Voltage Figure 9. Load Transient

5 BOARD LAYOUT

Proper board layout is important for all high-frequency switch-mode power supplies. Figure 10 through

Figure 14 show the board layout for the TPS61310EVM-638 PCB. The nodes with high switching

frequencies and currents are kept as short as possible to minimize trace inductance. Careful attention has

been given to the routing of high-frequency current loops. A single-point grounding scheme is used. Also,

the majority of the heat sinking for this device occurs through the top layer traces and vias pulled from the

IC’s solder bumps that carry high currents. For specific layout guidelines, see the TPS61310 data sheet.

Figure 10. Assembly Layer

SLVU419–April 2011 TPS61310EVM-638 Evaluation Module User Guide

BOARD LAYOUT

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Figure 11. Top Layer

Figure 12. Layer 2

8TPS61310EVM-638 Evaluation Module User Guide SLVU419–April 2011

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BOARD LAYOUT

Figure 13. Layer 3

Figure 14. Bottom Layer

SLVU419–April 2011 TPS61310EVM-638 Evaluation Module User Guide

SCHEMATICS AND BILL OF MATERIALS

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6 SCHEMATICS AND BILL OF MATERIALS

Figure 15. TPS61310EVM-638 Schematic

Table 3. TPS61310EVM-638 Bill of Materials

Qua. Ref Des Value Dl Size Part Number Mfr

C3225X7R1C2

2 C1, C2 22µF Capacitor, Ceramic, 16V, X5R 1210 TDK

26M

Capacitor, Ceramic, 10-µF, 6.3-V, C1608X5R0J1

2 C3, C4 10µF 0603 TDK

X5R, 10% 06MT

Ceramos LWW

2 D1, D2 CERAMOS Diode, Flash, 1amp, Vfwd 3.9V .065*.080 inch OSRAM

C9EP

Ceramos LWW

0 D3 Open Diode, Flash, 1amp, Vfwd 3.9V .065*.080 inch OSRAM

C9EP

1 D4 LS Q976 Diode, LED, [Color], 20mA 0603 LS Q976 Osram

3 J1, J3, J11 PEC04SAAN Header, 4-pin, 100mil spacing 0.100 x 4 PEC04SAAN Sullins

1 J12 PEC08SAAN Header, Male 8-pin, 100mil spacing 0.100 inch x 8 PEC08SAAN Sullins

J2, J5, J7, J8,

6 PEC03SAAN Header, Male 3-pin, 100mil spacing, 0.100 inch x 3 PEC03SAAN Sullins

J9, J10 N2510- Connector, Male Straight 2x10 pin, 0.338 x 0.788 N2510-

1 J4 3M

6002RB 100mil spacing, 4 Wall inch 6002RB

N2514- Connector, Male Straight 2x7 pin, 0.100 inch x N2514-

1 J6 3M

6002RB 100mil spacing, 4 Wall 2X7 6002RB

1 JP1 PEC03SAAN Header, 3-pin, 100mil spacing 0.100 x 3 PEC03SAAN Sullins

1 JP2 PEC02SAAN Header, 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN Sullins

10 TPS61310EVM-638 Evaluation Module User Guide SLVU419–April 2011

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